How to Install Ceramic Tile: Complete DIY Guide Today

Most tile installations fail not because of bad tile, but because of bad prep. Get the substrate wrong, skip the layout planning, or rush the thinset, and you will be pulling up cracked, hollow, or lippy tiles within a year.

This guide covers every step of ceramic tile installation from substrate assessment and layout planning through thinset application, tile setting, grouting, and sealing. Whether you are tiling a bathroom floor, a shower wall, a kitchen backsplash, or an entryway, the process follows the same core sequence. Follow it in order and your installation will last decades.

What Tools and Materials Do You Need Before You Start?

Ceramic tile installation requires two categories of materials: setting materials (thinset mortar, grout, and membrane) and finishing materials (sealer, caulk, and trim pieces). Buying the wrong type of any one of these will compromise the finished installation regardless of how well you set the tile.

Use the list below to assemble everything before demo day. Starting without a complete material list is the single most common reason DIY installations stall halfway through.

Setting Materials:

• Modified polymer thinset mortar (gray for floors, white for walls and light-colored grout joints)
• Unsanded grout for joints under 1/8 inch, sanded grout for joints 1/8 inch and wider
• Cement backer board (1/2 inch for floors, 1/4 inch for walls) or uncoupling membrane (Schluter Ditra)
• Alkali-resistant fiberglass mesh tape for backer board seams
• Waterproofing membrane for wet areas (RedGard, Laticrete Hydro Ban, or sheet membrane)

Tools:

• Notched trowel (1/4″ x 3/8″ square notch for floor tile up to 12 inches, 1/2″ x 1/2″ for large format tile)
• Tile wet saw for straight cuts and rip cuts on ceramic tile
• Manual snap tile cutter for fast straight cuts on standard-size ceramic floor tile
• Tile nippers for curved cuts around pipes and fixtures
• 4-foot level and long straightedge for substrate and layout checks
• Rubber mallet and beating block for seating tile into thinset
• Grout float (rubber-faced) for pressing grout into joints
• Tile spacers (1/16″, 1/8″, 3/16″, or 1/4″ depending on joint width)
• Chalk line and carpenter’s square for layout lines
• Bucket and margin trowel for mixing thinset and grout
• Sponges, buckets, and clean water for grout cleanup
• Knee pads for floor work

Safety gear:

• N95 respirator for cutting tile and mixing dry mortar (silica dust hazard)
• Safety glasses for all cutting operations
• Hearing protection when using a wet saw for extended periods

Plan to buy 10% more tile than your measured square footage for cuts, breakage, and future repairs. For diagonal patterns or herringbone layouts, increase the overage to 15%.

How Do You Assess and Prepare the Substrate?

The substrate is the surface under the tile. It must be flat, stable, structurally sound, and compatible with the thinset mortar you plan to use. A bad substrate produces tile that cracks, pops, or becomes hollow within months regardless of the tile quality or brand.

Tile is rigid. It cannot flex. If the floor or wall beneath it deflects more than L/360 (where L is the span in inches), the tile and grout joints will crack under normal foot traffic or weight. This deflection standard comes from the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation, which is the industry reference for all residential and commercial tile work.

Wood Subfloor Assessment

A wood subfloor must have a combined thickness of at least 1-1/8 inches to support ceramic tile without excessive deflection. This means a minimum of 3/4-inch plywood subfloor plus 3/8-inch underlayment, or a subfloor already at 1-1/8 inches.

Walk every square foot of the subfloor and listen for squeaks and soft spots. Screw down any squeaky areas with 1-5/8-inch coarse-thread screws spaced 6 inches apart in problem zones. Soft spots indicate rotted or delaminated plywood that must be replaced before tiling begins.

Check flatness with a 10-foot straightedge or a 4-foot level across multiple directions. The floor must not vary more than 1/4 inch over 10 feet. For tiles larger than 15 inches on the long side, the tolerance tightens to 1/8 inch over 10 feet per ANSI A108.02.

Fill low spots with floor-leveling compound. Grind down high spots or plane them flat. Do not try to bury unevenness in thick thinset. Thinset is a bonding agent, not a leveling agent, and thick beds crack.

Concrete Substrate Assessment

Concrete slabs are excellent tile substrates when they are flat, fully cured, and free of contamination. A slab must cure for at least 28 days before tile installation. Fresh concrete off-gasses moisture and alkaline compounds that degrade thinset bond strength.

Test for existing sealers or adhesive residue by sprinkling water on the surface. If water beads, the surface has been sealed and thinset will not bond. Grind or shot-blast sealed concrete before tiling. Remove old adhesive (mastic) completely. Never tile over cutback adhesive without testing for asbestos if the building predates the mid-1980s.

Fill cracks wider than 1/16 inch with epoxy filler or crack isolation membrane before tiling. A crack in the slab will eventually telegraph through the tile and grout joint above it. Applying a crack isolation membrane rated to ANSI A118.12 over the entire slab prevents this in older or suspect concrete.

Installing Cement Backer Board

Cement backer board (also called cementitious backer unit or CBU) provides a dimensionally stable, moisture-resistant substrate for tile in wet areas. Use 1/2-inch backer board on floors and 1/4-inch on walls. Standard brands include USG Durock, Hardiebacker, and Wedi.

Key Specifications for Cement Backer Board:

• Floor thickness: 1/2 inch (12mm)
• Wall thickness: 1/4 inch (6mm)
• Fastener type: 1-1/4-inch corrosion-resistant backer board screws spaced 6 to 8 inches at edges, 8 inches in field
• Seam treatment: Alkali-resistant fiberglass mesh tape set in thinset
• Gap at seams: 1/8 inch between boards (do not butt tightly)

Apply a thin layer of thinset to the subfloor before laying backer board. This eliminates voids beneath the board and prevents hollow spots that flex underfoot. Do not use drywall screws. They corrode in wet environments and lose holding power.

Offset backer board seams from subfloor seams by at least 2 inches. Never align the two sets of seams. Tape all backer board joints with alkali-resistant fiberglass mesh tape embedded in thinset. Standard drywall tape deteriorates in wet conditions and is not acceptable in tile applications.

Waterproofing Wet Areas

Grout is not waterproof. Neither is ceramic tile. Water passes through grout joints and reaches the substrate unless a dedicated waterproofing membrane separates the tile from the substrate.

For shower walls and shower floors, apply a liquid-applied waterproofing membrane such as Laticrete Hydro Ban or Custom Building Products RedGard. Roll or brush it over the backer board, paying special attention to corners and transitions. Apply two coats. The membrane must cover all seams, fastener heads, and transitions between wall and floor planes.

Alternatively, use a sheet membrane system such as Schluter Kerdi or Wedi board as both substrate and waterproofing in one layer. These systems cost more upfront but eliminate the separate waterproofing step and reduce total installation time.

The correct substrate is the highest-leverage decision in any tile installation. Nail this step and every subsequent step becomes easier. Skip it and nothing you do afterward will save the installation.

How Do You Plan the Tile Layout Before Setting a Single Tile?

Layout planning determines where the tile pattern starts, how cuts fall at the perimeter, and whether the visual result looks intentional or accidental. A good layout puts the largest cut tiles in the most visible corners and centers the pattern on the focal wall or the room’s main axis. A poor layout produces narrow slivers of tile at doorways or off-center patterns that draw the eye for the wrong reason.

Never start tiling from a wall corner. Walls are rarely square. Starting from a corner produces tiles that drift progressively off-square as you move across the room.

Finding the Room’s Center

Measure the two longest parallel walls in the room. Mark the midpoint of each. Snap a chalk line between the two midpoints. This is your first reference line. Repeat for the two remaining walls. The intersection of the two chalk lines is the room’s center point.

Dry-lay a row of tiles along each reference line from center to wall without thinset. Use spacers to simulate grout joints. Measure the cut at the wall. If the cut is less than half a tile wide, shift your entire layout by half a tile to make all perimeter cuts larger. Tiny slivers at the wall look bad and are difficult to cut and install cleanly.

Establishing Working Lines

Once you confirm the layout looks right with dry-laid tiles, snap your permanent working lines with a chalk line. These lines must be perfectly square. Use a 3-4-5 triangle to verify 90-degree corners. Measure 3 feet along one line, 4 feet along the intersecting line, and check that the diagonal between those two points measures exactly 5 feet. If not, adjust until it does.

For diagonal layouts, rotate the working grid 45 degrees off the room’s axis. This increases cut tile waste by approximately 15% but produces a visually dynamic result that makes smaller rooms appear larger. Plan your 15% material overage before buying tile for diagonal installations.

Focal Wall Planning for Wall Tile

On a tiled wall, the eye goes immediately to the wall you face when you enter the room. This is the focal wall. Center the tile layout on this wall so that any cuts at the sides are equal in width. A centered layout on the focal wall with equal cuts at both sides reads as intentional and professional.

Mark the center of the focal wall. Dry-lay tiles outward in both directions to see where cuts fall. Adjust as needed so cuts are at minimum half a tile wide. Lock in this center point before mixing any thinset.

Good layout planning takes 30 to 60 minutes for a typical bathroom or kitchen floor. It is the most undervalued step in the entire process and the one most directly responsible for how the finished installation looks from across the room.

How Do You Mix and Apply Thinset Mortar Correctly?

Thinset mortar is a Portland cement-based adhesive that bonds tile to substrate through a chemical reaction, not just mechanical grip. Polymer-modified thinset adds latex or acrylic polymers to improve flexibility, bond strength, and open time. Modified thinset is the correct choice for almost all residential ceramic tile installations on wood, backer board, or concrete substrates.

The ratio of polymer modification affects performance. Higher-modification thinsets (ANSI A118.4 rated) provide stronger bond strength for heavy tile, large format tile, or tiles with low absorption backs (fully vitrified porcelain). Standard modified thinset (ANSI A118.11) handles most ceramic tile in residential wet and dry applications.

Mixing Thinset to Correct Consistency

Add water to the bucket first. Then add dry thinset powder. This order prevents dry pockets at the bottom of the bucket. Mix with a mixing paddle and drill at low speed (300 to 400 RPM) until the mixture reaches a uniform, lump-free consistency.

Correct thinset consistency looks like peanut butter. It holds a notch shape when combed with a trowel. It does not slump or flow. It does not crumble or feel stiff. If it slumps, add more powder. If it crumbles, add more water. Add water or powder in small increments and remix completely before adjusting again.

Let the mixed thinset slake for 5 to 10 minutes. This allows the polymers to fully activate and the cement to hydrate. Mix briefly a second time after slaking. Do not add more water after slaking. Thinset mixed correctly has a working open time of 30 to 60 minutes depending on temperature, humidity, and product formulation.

Applying Thinset with the Correct Trowel

Trowel size determines the volume of thinset under the tile and therefore the bond coverage. Larger tiles require larger trowels. Using a small trowel on large-format tile is the most common cause of hollow spots and low bond coverage in amateur installations.

Use the table below to match trowel notch size to tile size.

Spread thinset over a 2 to 3 square-foot area at a time. Working larger areas allows thinset to skin over before the tile is set, which destroys bond strength. In hot or dry conditions, work even smaller areas (1 to 2 square feet) and check frequently that the thinset surface is still tacky.

Use the flat side of the trowel first to key a thin layer of thinset into the substrate. Then comb over that layer with the notched side at a consistent 45-degree angle. Consistent trowel angle produces uniform ridge height, which produces uniform bond coverage when the tile is pressed flat.

Back-Buttering for Large Format and Low-Absorption Tile

Large format ceramic tile (any tile with a side longer than 15 inches) and fully vitrified porcelain tile require back-buttering. This means applying a thin skim coat of thinset to the back of the tile before pressing it into the combed thinset on the substrate.

Back-buttering fills any texture voids on the tile back and guarantees that thinset contacts the tile back across its full surface area. Pull the first tile you set immediately after pressing it and check the coverage on its back. The thinset ridges must have collapsed flat and covered at least 95% of the tile back surface. If coverage is less than 95%, increase trowel size or add back-buttering to your process.

Correct thinset application, the right trowel, and a coverage check on the first tile are the mechanical foundation of a lasting installation. Everything after this point depends on getting these steps right.

How Do You Set Ceramic Tile Step by Step?

Setting tile is the most visible part of the installation, but it is also the most technically unforgiving. A tile set in wet thinset with one edge low and the adjacent edge high creates a lippage problem that cannot be fixed without removing the tile and starting over. Work methodically from your chalk lines outward and check level and alignment constantly.

The step-by-step widget below summarizes the full tile-setting sequence before each step is explained in detail.

Setting the First Tile and Checking Coverage

The first tile sets the benchmark for every other tile in the room. It must land exactly at the intersection of your two chalk lines with its edges flush to both lines. Spend more time on this tile than on any other single tile you will set.

Press the tile firmly into the thinset with a slight twisting motion. This motion collapses the thinset ridges and eliminates air pockets under the tile. Then set a beating block (a flat piece of scrap wood or commercial tile-setting block) on top of the tile and tap it firmly with a rubber mallet across its entire surface. This ensures full contact between tile back and thinset.

Pull the tile up immediately after your first beating and examine the back. Thinset should cover at least 95% of the tile back surface in wet areas. The remaining 5% are small voids between collapsed ridges. If you see large bare areas, stripes, or the full original ridge pattern, your trowel is too small or you are not pressing the tile firmly enough. Fix the issue before proceeding.

Maintaining Alignment and Level Across Multiple Tiles

After setting 3 to 4 tiles, lay a long straightedge across their faces. Any tile that rocks under the straightedge has a lippage problem. Press it down while the thinset is still wet and check again. If it still rocks, remove the tile, check the thinset for ridges, re-comb, and reset.

Use a 4-foot level every 6 to 8 tiles to confirm the installation plane is consistent across the work area. Floor tile does not need to be perfectly level in the spirit-level sense. It must be flat and consistent. A slightly sloped floor (toward a drain, for example) is acceptable as long as adjacent tiles are coplanar.

Cutting Tile for Perimeter Rows

Never try to snap a cut measurement in your head at the saw. Write each measurement on the tile face with a pencil or washable marker. Measure from the last full tile to the wall, then subtract the width of one grout joint. This gives you the exact cut width for that tile in that position.

For detailed guidance on every cutting method including wet saws, manual snap cutters, angle grinders, and hole saws for pipe cutouts, the complete breakdown of every ceramic tile cutting technique and when to use each method covers all tool options with blade selection, speed settings, and cut quality comparison for each.

For L-shaped cuts around door casings or corners, make two straight cuts that intersect. Do not try to make a diagonal cut. Two straight cuts from perpendicular directions produce a clean, accurate L-shape that a diagonal cut cannot match.

Movement Joints and Expansion Gaps

Tile expands and contracts with temperature and humidity changes. Without movement joints, tile will buckle or crack as the installation experiences thermal cycling. The TCNA Handbook requires movement joints at intervals not exceeding 20 to 25 feet in field tile, at all changes in plane (floor to wall), at all structural columns, and wherever tile meets a dissimilar material.

Movement joints look like grout joints but are filled with caulk, not grout. Use a caulk that matches the grout color. All inside corners (where a floor meets a wall, where two walls meet) must be caulked, not grouted. Grouting inside corners is one of the most common DIY mistakes. Grout in corners cracks within months because the two planes move independently.

Set field tile completely and confirm alignment before cutting any perimeter pieces. Working in this order keeps your layout lines intact and prevents the pattern drift that results from fitting perimeter tiles too early.

How Do You Grout Ceramic Tile Correctly?

Grout fills the joints between tiles, locks the installation into a unified surface, and prevents debris and moisture from working under the tile edges. Grouting too early (before thinset fully cures) is one of the most common causes of grout failure. The thinset must reach its full compressive strength before any load or stress is applied to the joints.

Wait a minimum of 24 hours after setting the last tile before grouting. In conditions below 65 degrees Fahrenheit or above 80% relative humidity, extend this to 48 hours. The thinset product data sheet specifies cure time for specific temperature ranges. Follow it.

Choosing the Right Grout Type

Use the table below to select the correct grout type for your joint width and installation environment.

For a complete walkthrough of the grouting process including mixing ratios, float technique, haze removal timing, and sealing schedules, the complete step-by-step guide to grouting ceramic tile covers the full sequence from joint preparation through final sealing with specific timing guidance for each grout type.

Applying Grout with a Grout Float

Mix grout to the consistency of peanut butter using the water ratio on the package. Over-watered grout is weak, porous, and prone to shrinkage cracking. Under-watered grout does not pack into joints fully and leaves pinholes.

Hold the grout float at a 45-degree angle to the tile surface. Force grout into the joints with firm diagonal strokes. Working diagonally prevents the float edge from dragging grout back out of the joints. Press firmly enough that joints are packed solid with no voids or air pockets.

After packing the joints, hold the float at a steeper angle (approximately 70 to 80 degrees) and use it as a squeegee to remove excess grout from the tile face. Work diagonally again to prevent pulling grout out of joints. Remove as much excess as possible before it begins to set. This dramatically reduces cleanup time.

Cleaning Grout Haze from Tile Surface

Grout haze begins to set 15 to 30 minutes after application depending on temperature and humidity. Do not wait until it is fully hard. Start cleaning when the grout in the joints is firm to the touch but the haze on the tile face is still slightly soft.

Wipe the tile face with a damp (not wet) sponge in a circular motion. Rinse the sponge frequently in clean water. Change the cleaning water often. Dirty water with grout suspension smears haze back onto tiles rather than removing it. Use clean water and a clean sponge every few passes.

A final polish with a dry microfiber cloth removes any remaining light haze after the grout has cured for 24 hours. For stubborn dried haze, use a commercial grout haze remover product. Do not use acid-based cleaners on colored grout. They strip pigment from the grout joint.

Sealing Grout Joints

Cementitious grout (both sanded and unsanded) is porous and absorbs stains, water, and bacteria without sealer. Apply a penetrating siloxane or fluoropolymer grout sealer after grout has cured for a minimum of 72 hours. In cool conditions (below 65 degrees Fahrenheit), allow 7 days before sealing.

Apply sealer with a small foam brush or sealer applicator. Work it into the joint surface without spreading excess onto the tile face. Wipe excess from tile immediately. Allow 24 hours between coats if applying two coats. Reapply grout sealer annually in wet areas and every 2 to 3 years in dry areas.

Epoxy and urethane grouts do not require sealing. Their polymer binders make them inherently impermeable from the moment they cure.

Grouting is the last step where you can still make small corrections by adding grout to low joints before everything sets hard. Work carefully, clean consistently, and the result is a professional-quality surface that holds up for 20 or more years without rehabilitation.

How Do You Install Ceramic Tile on a Bathroom Floor?

A bathroom floor presents three challenges that do not exist in dry installations: waterproofing around the toilet flange, establishing a level plane that drains properly toward the shower or floor drain, and working in a small room with many obstacles (vanity base, toilet, tub surround, door threshold). Address all three before setting a single tile.

Toilet Flange and Floor Drain Preparation

The toilet flange sits on top of the finished tile surface. If you tile over the existing subfloor level without raising the flange, the flange sits below the finished tile surface and the toilet will rock. Add a flange extension ring to bring the flange up to the finished tile height. Extension rings are available in 1/4-inch to 1-inch increments to match the thickness of your tile and setting materials.

Cap the toilet drain opening with a rag or foam plug before tiling. Debris and thinset in the drain line create blockages that are expensive to clear. Remove the plug only after grouting is complete and the floor is fully cleaned.

Tile Layout Around Obstacles

In a small bathroom, the toilet is the visual focal point. Center the tile layout on the toilet centerline rather than the room center if the toilet is in a visually prominent position. Equal-width tiles on both sides of the toilet look intentional. A narrow sliver on one side and a wide cut on the other looks like an afterthought.

For the tile layout around the tub surround, plan cuts so the grout joint at the tub edge aligns with the grout joint at the tub wall tile, if you are tiling the tub surround as well. Continuity between floor and wall grout lines is a professional detail that elevates the finished appearance significantly.

Shower Floor Slope and Tile Sizing

Shower floors require a positive slope toward the drain of 1/4 inch per foot in all directions. This slope prevents water from pooling on the tile surface and standing between grout joints. Most mud-set shower floors establish this slope with a sloped mortar bed (also called a pre-slope) before the tile substrate is installed.

Use small tile (4 x 4 inch maximum, or mosaic tile on mesh) for shower floors. Small tile conforms to the sloped surface without lippage. Large-format tile on a sloped shower floor requires complex back-buttering and shimming that is difficult to execute correctly even for experienced installers. The TCNA’s Handbook (Method B419) covers sloped floor tile installation specifications in detail.

How Do You Install Ceramic Tile on Walls and Shower Surrounds?

Wall tile installation differs from floor tile installation in two critical ways: gravity works against you while thinset cures, and wet areas require a fully waterproof substrate before any tile is set. Non-sag thinset mortar is formulated to resist the slipping and sagging that standard floor thinset experiences when applied to vertical surfaces.

Use a thinset rated as “non-sag” or specifically labeled for wall tile. These formulations contain additional thickeners that keep tile from slipping down the wall in the 24 hours before thinset develops initial set strength. Standard floor thinset on a wall allows tiles to creep downward, destroying grout joint consistency and creating lippage.

Setting a Horizontal Ledger Board

Before setting any wall tile, install a temporary horizontal ledger board along the wall at the height of the first full tile row above the floor. The ledger gives you a straight, level reference to set the first course of tile against. Without a ledger, the weight of upper tiles presses down on lower tiles before thinset sets, compressing joints and causing tile creep.

Locate the ledger by finding the low point of the floor with a level. Measure up one tile height from the low point and snap a level line around the entire room at that height. Screw a straight piece of 1×4 lumber to the wall along this line. Set tile from the ledger upward. After the thinset cures (24 hours), remove the ledger and cut the bottom row of tile to fit against the floor.

Waterproofing the Shower Surround

A shower surround must be waterproof behind every tile. Ceramic tile and grout are not waterproof barriers. Water passes through grout joints and accumulates behind tile if no membrane is present. Over 6 to 24 months, trapped water destroys the substrate, produces mold, and causes tiles to de-bond and fall off the wall.

Apply liquid waterproofing membrane (Laticrete Hydro Ban, Custom RedGard, or equivalent) over the entire shower surround backer board before setting any tile. Pay particular attention to inside corners (floor-to-wall and wall-to-wall) where two substrates meet and movement is greatest. Apply membrane in a 4 to 6 inch band at all corners before spreading it across the flat wall surfaces.

Allow the membrane to cure fully according to the manufacturer’s instructions (typically 24 hours for liquid membranes) before applying thinset for tile. Applying thinset over uncured waterproofing membrane interferes with the membrane’s bond to the substrate.

Setting Wall Tile Above the Ledger

Work from the center of each wall outward, exactly as you would on a floor. Spread thinset in small sections (1 to 2 square feet at a time) to prevent skinning in the time it takes to position each tile. Press each tile firmly and check that it sits flush with its neighbors before moving on.

Use tile wedges or adjustable tile leveling clips (a tile leveling system such as Raimondi or Perfect Level Master) to hold tiles in plane while thinset cures. These systems use a clip inserted under the tile edge and a wedge that locks the adjacent tiles at exactly the same height. They eliminate lippage mechanically without requiring constant manual checking.

For backsplash tile installation specifically (kitchen or bathroom), the full process from template creation through grouting is covered in the complete kitchen ceramic backsplash tile installation guide, including outlet and switch box cutouts, behind-range heat considerations, and adhesive options for non-standard substrates like painted drywall.

Quick Reference: Key Terms for Ceramic Tile Installation

What Are the Most Common Ceramic Tile Installation Mistakes and How Do You Fix Them?

Most ceramic tile failures trace back to four root causes: inadequate substrate preparation, wrong thinset type or coverage, grouting too early, and skipping movement joints at corners and transitions. Understanding each failure mechanism helps you prevent it and diagnose it if it appears after installation.

Hollow Tiles and Bond Failure

A hollow tile sounds like a drum when tapped. This means the tile back is not bonded to the thinset below it. Hollow spots develop when thinset ridges never fully collapsed under the tile (low coverage), when thinset skinned over before the tile was placed (exceeded open time), or when the substrate was dusty or sealed and the thinset could not penetrate and grip.

In dry areas, a small hollow spot in a non-traffic zone may not immediately cause a problem. In wet areas, hollow tiles trap water, breed mold, and eventually pop off the wall or floor. The only reliable fix for a hollow tile is removal and resetting. Injecting grout or thinset into the joint does not restore bond. The tile must come out.

Remove a hollow tile by scoring around the grout joints with a grout saw or oscillating tool. Chisel out the tile carefully to avoid damaging adjacent tiles. Scrape the substrate clean of old thinset, allow it to dry, and reset the tile with fresh thinset using the correct trowel size and complete back-buttering.

Cracked Grout Joints

Cracked grout joints in a straight line across the floor almost always indicate a crack in the substrate below. The crack in the substrate transmits through the thinset layer and opens the grout joint above it. Filling the cracked joint with new grout is a temporary fix. The crack will re-open within weeks or months.

The permanent fix is to remove the affected tiles, repair or bridge the crack in the substrate with a crack isolation membrane (ANSI A118.12 rated), and reset the tiles. If the crack is in a concrete slab, it may be structural. Consult a structural engineer before tiling over an active or widening crack in a concrete floor.

Cracked grout in inside corners (floor-to-wall, wall-to-wall) is not a crack isolation problem. It is a movement joint problem. Those corners should never have been grouted. Remove the cracked grout entirely and replace it with flexible caulk in a matching color.

Tile Lippage

Lippage is a height difference between adjacent tiles. Lippage above 1/32 inch is visible to the eye and creates a tripping hazard on floors. Lippage above 1/16 inch is a code violation in commercial installations per ANSI A108.02.

Lippage develops when tiles are not pressed fully into thinset, when the substrate has humps or waves, or when tiles have excessive warpage (bow in the tile body itself). Warped large-format tiles are the most common cause of lippage in modern tile installations. Tile warpage is manufactured into the tile body during the pressing and firing process and cannot be corrected on site. The industry standard maximum warpage for floor tile is 0.5% of the tile’s longest side.

Prevent lippage by checking flatness tolerance before tiling, using the correct trowel size, and using a tile leveling clip system on all tiles larger than 12 x 12 inches. A tile leveling system mechanically holds adjacent tiles at equal height while thinset cures and is the single most effective tool for producing lippage-free large-format tile installations.

Grout Haze That Will Not Clean Off

Dried grout haze that has cured for more than 48 hours is difficult to remove with water alone. It requires a commercial grout haze remover, which is a mild acidic solution that dissolves the cementitious residue without attacking fully cured grout in the joints.

Apply haze remover with a nylon scrub pad. Do not use steel wool or metal scrubbers on glazed ceramic tile. Rinse thoroughly with clean water after the haze dissolves. Test haze remover on an inconspicuous area first on any tile other than standard glazed ceramic. Haze remover is not appropriate for natural stone, unglazed tile, or colored grout joints.

Prevention is far easier than cure. Clean grout haze within 30 minutes of application before it cures to the tile face. Work in small sections, keep cleaning water clean, and change sponge water every 2 to 3 passes.

Tiles Popping Off the Wall

Wall tiles that pop off are almost always a bond failure caused by one of three conditions: thinset was applied to a dusty or unsealed backer board, thinset skinned over before the tile was placed, or the wrong thinset (standard floor thinset without non-sag properties) was used on a vertical surface and the tile slid before cure was complete.

In shower areas, tile falling off the wall after years of service usually indicates that water penetrated the grout joints, destroyed the substrate behind the tile, and left the tile with nothing solid to bond to. The fix is a complete shower teardown: remove all tile and substrate, inspect and replace damaged framing and substrate, install waterproofing membrane, and re-tile from scratch.

These failures are entirely preventable. Using the right substrate, the right thinset, and a waterproof membrane in wet areas eliminates all three root causes at the installation stage.

What Does Ceramic Tile Installation Cost for a DIY Project?

A DIY ceramic tile installation costs between $3 and $12 per square foot for materials depending on tile selection, substrate requirements, and setting materials chosen. This compares to a fully installed professional cost of $12 to $35 per square foot including labor. The labor savings on a 100 square-foot bathroom floor represent $900 to $2,300 in retained value for a competent DIY installer.

Use the table below to estimate material costs for a standard residential bathroom floor installation of 50 square feet.

Where to Spend More and Where to Save

Spend on tile. Cheap tile with poor dimensional consistency (variation in size and thickness across a box) produces lippage and uneven grout joints that no amount of installation skill can fully correct. Buy tile from a single batch (same dye lot number) to avoid color variation across the floor.

Spend on thinset. Premium modified thinset costs $5 to $8 more per bag than basic thinset and provides measurably better bond strength, longer open time, and greater resistance to thermal cycling. Over a 15 to 20 year installation lifespan, the cost difference per square foot is negligible.

Save on grout sealer application by using a brush applicator instead of a spray. Spray sealers waste product on the tile face and cost more per joint foot covered. A foam brush and steady hand covers more joint with less sealer in the same time.

How Do You Maintain Ceramic Tile After Installation?

Ceramic tile is one of the most durable and low-maintenance flooring materials available. A properly installed and sealed ceramic tile floor requires only routine cleaning, annual grout sealer reapplication in wet areas, and periodic inspection for cracked or loose tiles.

For day-to-day cleaning, sweep or vacuum to remove abrasive grit before wet mopping. Grit ground underfoot scratches the glaze on ceramic tile over time, dulling the surface and making it harder to clean. A microfiber flat mop with a pH-neutral floor cleaner is the standard tool for ceramic tile. Avoid steam mops on grouted ceramic tile. Steam forces water into grout joints under pressure, washing out grout sealer and accelerating deterioration.

The complete approach to routine and deep cleaning of ceramic tile surfaces, including stain removal for specific stain types (grease, hard water deposits, soap scum, rust, and mold), is covered in the complete guide to cleaning ceramic tile surfaces, with specific product recommendations and technique guidance for glazed, unglazed, and polished finishes.

Resealing Grout

Reseal grout joints in wet areas (showers, tub surrounds, bathroom floors) once per year. Reseal grout in dry areas (kitchen floors, entryways) every 2 to 3 years. Test whether resealing is needed by placing a few drops of water on the grout joint. If the water beads up and does not absorb into the grout within 5 minutes, the sealer is intact. If water absorbs immediately and darkens the grout, reseal.

Clean the grout thoroughly before resealing. A sealer applied over dirty grout locks contaminants into the joint surface and reduces the effectiveness of the sealer layer. Use a grout brush and a grout-specific cleaner before applying sealer.

Repairing Individual Cracked or Loose Tiles

A single cracked tile can be replaced without disturbing the surrounding installation. Score the grout joints around the damaged tile with an oscillating multi-tool equipped with a grout removal blade. Remove grout on all four sides down to the substrate. Then chisel or drill out the damaged tile carefully, working from the center outward to avoid cracking adjacent tiles.

For a cracked ceramic sink or similar ceramic fixture, the repair approach differs from floor tile repair. The process for assessing crack severity and applying ceramic repair compounds to non-tile ceramic items is detailed in the DIY guide to repairing cracked ceramic sinks and fixtures, which covers epoxy fillers, touch-up paint systems, and when a replacement is the more cost-effective choice.

Scrape the substrate completely clean of old thinset. If the substrate is damaged, repair it before resetting the tile. Back-butter the replacement tile, set it in fresh thinset, and allow full cure before regrouting the joints. Match the grout color as closely as possible. Aged grout and new grout do not match exactly, but the color difference fades as the new grout absorbs ambient soil and moisture over several weeks.

A properly installed ceramic tile floor or wall requires almost no intervention for 15 to 25 years beyond regular cleaning and periodic grout sealing. The maintenance cost over that lifespan is minimal compared to carpet, hardwood, or vinyl plank alternatives.

Can You Install Ceramic Tile Over Existing Tile?

Tiling over existing tile is possible in specific conditions, but it requires careful assessment before committing. The existing tile layer adds height to the finished floor, which affects door clearance, transition thresholds, and toilet flange height. Adding a second tile layer over a first raises the floor by approximately 3/8 to 5/8 inch depending on tile thickness and thinset bed depth.

The existing tile installation must be in solid condition for over-tiling to work. Tap every existing tile. Any hollow tile, cracked tile, or loose tile must be re-bonded or removed before the new layer goes on top. A hollow spot in the base layer becomes a hollow spot in the new layer because the tile above it has no solid material to transfer load to.

When Over-Tiling Is Acceptable

Over-tiling is acceptable when the existing tile is solidly bonded (zero hollow tiles), the substrate beneath the original tile is structurally sound, the additional floor height does not create code or clearance problems, and the existing tile surface is clean and free of sealers, waxes, or contaminants that would prevent thinset adhesion.

Rough up the existing glazed tile surface with an angle grinder and diamond cup wheel or 80-grit sandpaper before applying thinset. The glaze is smooth and impermeable. Thinset does not bond reliably to a smooth glazed surface without mechanical preparation. After roughing up the surface, apply a thin bond coat of modified thinset over the entire existing tile before combing ridges for the new tile layer.

When to Remove Existing Tile Instead

Remove existing tile before re-tiling when any of the following conditions exist: more than 10% of existing tiles are hollow or cracked, the substrate beneath is deteriorated or water-damaged, the additional height would require shimming door casings or adjusting plumbing rough-ins, or the existing tile is in a wet area where waterproofing integrity is in question.

Tile removal is difficult and labor-intensive, but it is the only way to guarantee a sound substrate for the new installation. Use a floor tile chisel, an electric demolition hammer equipped with a chisel bit, or a dedicated floor tile removal machine for larger areas. Wear knee pads, eye protection, and an N95 respirator during tile demolition. Dust from demolition of older ceramic tile may contain crystalline silica.

How Long Does a DIY Ceramic Tile Installation Take?

A 50 to 80 square-foot bathroom floor installation takes most first-time DIY installers 2 to 3 days spread across a weekend, not including substrate preparation. Substrate prep (installing backer board, mixing and applying leveling compound, allowing it to cure) adds 1 to 2 days. Grouting and sealing adds another day after the thinset cure period.

The timeline breaks down as follows for a typical 60 square-foot bathroom floor with a sound existing subfloor:

• Day 1: Demo existing floor covering, assess and repair subfloor, install backer board, mix and apply leveling compound (if needed)
• Day 2: Let leveling compound cure 6 to 24 hours. Snap layout lines, dry-lay tile to confirm layout, mix thinset, set all field tile. Allow thinset to begin setting overnight.
• Day 3: Set perimeter cuts, allow 24-hour thinset cure from last tile set
• Day 4: Remove spacers, mix and apply grout, clean haze, allow 72-hour grout cure
• Day 7: Apply grout sealer, reinstall fixtures, complete transition thresholds

Professional tile setters working the same 60 square feet complete substrate prep and tile setting in a single 8-hour day and return for grouting the following morning. The difference is not technique speed. It is familiarity with the sequence and confidence in decision-making. First-time installers spend significant time double-checking measurements and layout decisions that professionals have internalized over hundreds of installations.

Do not rush the cure times. The 24-hour thinset cure before grouting and the 72-hour grout cure before sealing are not conservative suggestions. They are the minimum times the chemistry requires to develop adequate strength. Walking on tile before thinset cures, or sealing grout before it cures, produces failures that require complete rework.

How Do You Install Ceramic Tile in a Shower: Special Considerations

A shower is the highest-demand tile installation in any residential project. It combines constant water exposure, thermal cycling (cold to hot water multiple times per day), chemical exposure (soaps, shampoos, cleaning products), and physical impact from bathing. Every material and method choice in a shower must account for long-term water resistance, not just initial appearance.

Shower Substrate and Waterproofing System

The shower substrate and waterproofing system are a single integrated decision, not two separate steps. The three most common systems used in residential shower construction are:

System 1: Cementitious backer board with liquid waterproofing membrane. Install 1/2-inch cement backer board (not moisture-resistant drywall) on all shower walls. Apply two coats of liquid waterproofing membrane (RedGard, Hydro Ban, or Wedi Saniflex). Set tile in white polymer-modified thinset. This is the most common DIY approach and is code-compliant when executed correctly.

System 2: Wedi or Schluter Kerdi board as combined substrate and waterproofing. Wedi board is an extruded polystyrene core faced with fiberglass-reinforced cement skin. It is inherently waterproof and provides a lightweight, dimensionally stable substrate. More expensive upfront but eliminates the separate waterproofing step and reduces total installation time.

System 3: Traditional mud-set shower with hot-mop waterproofing. The shower floor is built up with a sloped mortar bed and waterproofed with a hot-mopped CPE or PVC liner. This is the most durable and water-resistant system but requires professional skills to execute correctly. Not recommended for first-time DIY installers.

Tile Selection for Shower Walls and Floors

Choose tile with an absorption rate below 3% for shower walls (classified as impervious or vitreous per ANSI A137.1). Highly porous tile (absorption above 7%, classified as non-vitreous) absorbs shower water, harbors bacteria, and deteriorates faster in wet applications. Standard ceramic wall tile rated for wet applications meets the absorption requirement. Unglazed natural stone with high absorption does not without additional sealing treatment.

Shower floors require tile with a coefficient of friction (COF) of 0.42 or greater when wet per the Americans with Disabilities Act (ADA) guidelines for bathing surfaces. Small mosaic tile (2 x 2 inch or smaller) on mesh backing automatically increases the grout joint-to-tile ratio, which provides additional slip resistance on shower floors. Polished stone and large-format smooth tile do not meet the COF threshold for shower floor use without additional surface treatment.

Grout for Showers

Use epoxy grout or a premium urethane grout such as Custom Building Products Prism for shower applications wherever budget allows. These grouts are chemically inert, impermeable to water and cleaning chemicals, and do not require sealing. Standard cementitious grout in a shower requires annual sealing and still deteriorates faster than epoxy under the chemical load of daily bathing products.

If using cementitious grout in a shower, seal it within 72 hours of completion and reseal annually. Use a penetrating siloxane sealer specifically formulated for wet areas. Topical sealers peel and trap moisture beneath them in high-humidity environments.

Niche and Bench Construction

Shower niches and benches are the most water-vulnerable points in a shower enclosure. They are horizontal or near-horizontal surfaces that collect standing water after each use. Any substrate failure at these points allows water to penetrate behind the tile and cause framing rot that is not visible until the damage is severe.

Build niches and benches from waterproof materials only: Wedi board, Schluter Kerdi-Board-S (specifically designed for shower niches), or traditional mud-set construction. Do not build shower niches from standard cement backer board alone without a liquid waterproofing membrane applied to all surfaces. Apply waterproofing membrane to all interior surfaces of the niche, including the back wall, before tiling.

The shower installation is the one situation in residential DIY tile work where the cost of a professional waterproofing consultation or inspection is worth every dollar. A failed shower waterproofing system costs $5,000 to $15,000 to remediate when it includes structural framing repair and mold remediation. The waterproofing materials themselves cost under $200. The proportion is not rational. Spend the $200 and do it right.

Is Ceramic Tile Good for Outdoor Installation?

Standard ceramic tile is not suitable for outdoor installation in climates that experience freeze-thaw cycles. Standard ceramic tile has an absorption rate above 3%. Water absorbed into the tile body expands when it freezes, generating internal stress that fractures the tile from within. A single hard freeze can crack an entire installation of non-frost-resistant tile.

For outdoor use in freeze-thaw climates, specify porcelain tile with an absorption rate below 0.5% (classified as impervious per ANSI A137.1). Fully vitrified porcelain does not absorb enough water to fracture during freezing. It is also harder, denser, and more resistant to chemical staining than standard ceramic.

Outdoor Substrate Requirements

Outdoor tile substrates face thermal expansion far greater than indoor installations. Concrete patios expand and contract with seasonal temperature swings of 80 to 120 degrees Fahrenheit in many climates. Standard thinset cannot accommodate this movement without cracking. Use a large-and-heavy tile mortar (ANSI A118.15) rated for exterior applications with an elongation factor of at least 50%.

Install exterior movement joints every 8 to 10 feet in outdoor tile installations. This is more frequent than interior requirements (20 to 25 feet) because outdoor temperature swings are far greater. Use a flexible silicone caulk rated for exterior and UV exposure in all movement joints. Standard latex or acrylic caulk degrades rapidly under UV exposure and outdoor weathering.

Slip Resistance for Exterior and Pool Surrounds

Exterior tile exposed to rain and wet conditions requires a minimum COF of 0.60 when wet per ANSI A326.3 test method. Pool surround tile must meet a COF of 0.60 or higher. Smooth polished porcelain, regardless of its absorption rating, does not meet this COF requirement for exterior wet applications. Use textured or matte-finish porcelain, or specify tile that carries an explicit wet COF rating on its technical data sheet.

Ceramic tile is an excellent outdoor material in warm or dry climates where freeze-thaw is not a concern. In freeze-thaw climates, the absorption rate is the deciding specification. Below 0.5% absorption, the tile is suitable for outdoor use. Above 3%, it is not. Values between 0.5% and 3% require review of the specific product’s freeze-thaw test data before specifying for exterior use.

Can You Install Ceramic Tile Yourself or Do You Need a Professional?

Most homeowners with basic tool skills and patience can successfully install ceramic tile in standard dry applications (kitchen floors, entryways, laundry rooms, and straightforward bathroom floors) without professional assistance. Wet areas (showers and steam rooms), large-format tile over 24 inches, and installations with complex patterns or transitions benefit significantly from professional experience.

The decision between DIY and professional installation should be based on three factors: installation complexity, wet area involvement, and the cost of a do-over. A bathroom floor that fails and must be redone costs two to three times the original installation price. In wet areas where structural water damage is possible, professional waterproofing is insurance, not a luxury.

For most first-time DIY installers, start with a dry application (laundry room floor, entryway, or kitchen floor) before attempting a shower. The skills transfer directly and the cost of a mistake is a single tile removal and reset rather than a full shower teardown.

Does Ceramic Tile Need to Be Sealed?

Glazed ceramic tile does not need sealing. The glaze is a fired glass coating that is impermeable to water, stains, and bacteria. It cannot absorb sealers and does not benefit from topical sealers applied to its surface.

The grout between the tiles does need sealing unless you are using epoxy or urethane grout. Cementitious grout (sanded and unsanded) is porous and absorbs water, food stains, soap residue, and bacteria without a penetrating sealer. Apply sealer to grout joints only, not to the tile face, in standard glazed ceramic installations.

Unglazed ceramic tile and natural stone tile do need sealing. These materials are porous on their face surface and absorb stains directly. Apply a penetrating siloxane or fluoropolymer impregnating sealer to the entire tile face (and grout joints) in unglazed installations. Reapply annually in wet areas and every 2 to 3 years in dry areas.

What Grout Width Should You Use for Ceramic Tile?

Standard ceramic floor tile (12 x 12 inches and similar) is typically installed with a 1/8-inch grout joint. Wall tile (4 x 4 and 3 x 6 subway tile) is commonly installed with a 1/16-inch joint for a tight, contemporary look or a 1/8-inch joint for a more traditional appearance.

The tile manufacturer’s recommended joint width accounts for the dimensional variation in that specific tile. Rectified tile (tile that has been precisely cut to uniform size after firing) can be installed with joints as narrow as 1/16 inch. Non-rectified tile (tile sized by the die without precision trimming) requires joints of 1/8 inch or wider to absorb dimensional variation without lippage.

Wider grout joints (3/16 to 1/4 inch) are specified for outdoor applications, large natural stone installations, and situations where the substrate flatness tolerance cannot be achieved within 1/4 inch over 10 feet. Wider joints are more forgiving of minor substrate irregularities and tile size variation.

Can You Use Regular Drywall in a Shower?

Regular drywall (standard gypsum board) must never be used as a tile substrate in wet areas. Standard drywall deteriorates rapidly when exposed to moisture. The gypsum core softens, the paper face delaminates, and mold colonizes the wet organic material within weeks of moisture exposure.

Moisture-resistant drywall (greenboard or purple board) is also not an acceptable shower substrate. The TCNA Handbook explicitly excludes moisture-resistant gypsum board as a substrate for shower walls. Moisture-resistant drywall reduces water penetration compared to standard drywall but does not prevent it. Water eventually reaches the gypsum core and the failure mode is identical to standard drywall.

The correct substrate materials for shower walls are cement backer board, fiber-cement board, foam board tile backer (Wedi, Schluter Kerdi-Board), or a cured mud-set mortar bed. Each requires a separate waterproofing layer applied before tile installation, or is inherently waterproof (foam board products) by its material composition.

How Do You Remove Ceramic Tile Without Damaging the Subfloor?

Ceramic tile removal without damaging the subfloor requires patience, the right tools, and a systematic approach. The goal is to break the thinset bond between the tile and substrate without gouging, fracturing, or delaminating the wood or concrete below.

Start at a grout joint. Use an oscillating multi-tool or grout saw to cut through the grout joint down to the substrate on all four sides of one tile. This breaks the mechanical connection between adjacent tiles and gives you access to the tile edge.

Insert a wide cold chisel or a floor chisel at the tile edge at a low angle (approximately 15 to 20 degrees from horizontal). Strike with a hammer firmly but not aggressively. The goal is to slide the chisel under the tile and break the thinset bond in a shearing motion. Do not try to pry the tile up from a steep angle. This fractures the subfloor or gouges the concrete.

For larger tile removal projects (entire bathroom floors, large format tile), rent an electric floor tile removal machine. These machines use a wide chisel that oscillates at high speed and slides under tile efficiently without manual hammer work. They preserve the subfloor significantly better than manual demolition on large areas.

After removing tile, scrape the residual thinset from the subfloor. A floor scraper removes most thinset from concrete. For plywood subfloors, use a belt sander or floor grinder to bring the remaining thinset layer flat rather than trying to remove it entirely. A completely clean plywood surface is not required. A flat surface is.

What Type of Ceramic Tile Is Best for a Bathroom Floor?

The best ceramic tile for a bathroom floor combines four properties: sufficient hardness to resist scratching from daily traffic, a COF rating above 0.42 when wet for slip safety, dimensional uniformity for clean installation, and an absorption rate below 3% for moisture resistance.

For most residential bathrooms, a glazed ceramic floor tile rated for floor use (PEI hardness rating of 3 or above, wet COF above 0.42) in a 12 x 12 or 12 x 24 format delivers the best combination of durability, ease of cleaning, and installation quality. The PEI (Porcelain Enamel Institute) hardness rating system classifies tile for use in light residential (PEI 1-2), residential floors (PEI 3), heavy residential and light commercial (PEI 4), and commercial heavy-duty (PEI 5).

Matte-finish tiles provide better slip resistance than polished or satin-finish tiles at equivalent hardness ratings. A matte-finish ceramic floor tile rated PEI 3 with wet COF above 0.42 is the safest and most practical choice for bathroom floors in homes with children or older adults.

Mosaic tile (tiles 2 x 2 inches or smaller on mesh backing) is an excellent choice for shower floors specifically because the high number of grout joints per square foot increases friction and meets the 0.42 wet COF threshold easily. Ceramic mosaic tile on mesh backing is also easier to conform to sloped shower floors than large-format tile.

How Do You Handle Transitions Between Tile and Other Flooring?

A transition between ceramic tile and an adjacent flooring material (hardwood, carpet, vinyl plank, or another tile) must accomplish three things: it must visually frame the end of the tile field, accommodate any height difference between the two surfaces, and provide a movement joint between materials that expand and contract at different rates.

Use a metal transition strip, a schluter trim piece, or a wood threshold to handle these transitions. The type depends on the height differential and the materials being joined. Schluter offers an extensive line of aluminum and stainless steel trim profiles for virtually every transition scenario, including Jolly (tile edge trim with no adjacent floor), Reno (transition to higher floor), and Schiene (tile edge protection at same height).

Never run tile tight to a wood floor without a transition. Wood expands significantly with humidity changes (up to 1% of its width per 4% change in moisture content). A rigid tile field butting directly against wood that expands will either crack the tile at the joint or buckle the wood floor. A flexible caulk joint or a transition strip with a slip mechanism accommodates this differential movement.

Height differences above 1/4 inch at a transition create a tripping hazard per ADA guidelines and most residential building codes. Use a ramp transition strip to slope from the lower to the higher surface over a 1-inch horizontal run. Do not leave abrupt transitions above 1/4 inch exposed in any residential or commercial installation.

What Happens If You Walk on Tile Too Soon After Setting?

Walking on tile before thinset achieves its initial set strength shifts the tiles laterally in the wet mortar bed. This breaks the thinset ridge contact established when the tile was first pressed in, reduces bond coverage, and can shift tiles out of alignment or into lippage with their neighbors. In worst cases, tiles that shift significantly before thinset sets must be lifted and reset.

Standard modified polymer thinset achieves initial set (enough to resist light foot traffic) in approximately 12 to 16 hours at 70 degrees Fahrenheit and 50% relative humidity. Full cure strength develops over 28 days, but the industry standard waiting period before grouting (24 hours) and before normal traffic (24 to 48 hours) is based on when the thinset is strong enough to resist normal residential loads without displacement.

In cool conditions (below 60 degrees Fahrenheit), thinset cures significantly more slowly. Double the standard waiting time in cool environments. In hot, dry conditions (above 85 degrees Fahrenheit with low humidity), thinset can develop initial set in 8 to 10 hours but may also dry too quickly on the surface (skin over) during application. Work in small batches and keep the substrate and tile cool in hot weather installations.

Ceramic tile installation done correctly is a permanent improvement that adds lasting value to any home. The preparation steps covered in this guide, from substrate flatness assessment through proper thinset application and movement joint placement, are not complicated. They are sequential. Follow each step in order, verify each before moving to the next, and the finished installation will outlast every other surface in the room.

The most important investment in any tile project is time spent on preparation and layout before a single tile is set. Everything after that is execution of a plan that either works or does not based on what you did before mixing the first bag of thinset.

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