How to Tile on and Around Your Old Tub

Renovating a bathroom with an aged tub can elevate both style and durability. This guide covers the steps, materials, and best practices for tile installations on and around an old tub, including prep, waterproofing, cutting, setting, grouting, and sealing. With careful planning and precise execution, a tiled tub surround and surrounding walls can look seamless and endure moisture for years.

Preparation And Planning

Start with a clear plan for tile size, layout, and waterproofing. Measure the tub dimensions, ceiling height, and wall conditions. Decide on tile spacing, considering a standard 1/8-inch grout line for a clean look, or 3/16-inch for more room to adjust. Choose a water-resistant underlayment and cement backer board appropriate for wet areas. Ensure the tub is securely anchored and check for any leaks or rot before proceeding.

Tools And Materials

• Tile: ceramic, porcelain, or natural stone depending on budget and style
• Backer board or waterproof cement board
• Waterproof membrane or liquid waterproofing barrier
• Thin-set mortar (modified for tile and substrate)
• Grout (sanded for larger joints, unsanded for small joints)
• Tile spacers, trowels, knee pads
• Tile cutter or wet saw, nippers
• Silicone caulk or color-matched sealant for edges
• Paint roller or brush for surrounding walls after tiling
• Level, chalk line, and rubber mallet
• Bucket, sponge, grout float, and clean rags

Surface Preparation

Remove any loose paint or old caulk from the tub surround and walls. Clean surfaces thoroughly and let dry. Install backer board over the wall area that will receive tile, sealing all seams with alkali-resistant tape. Apply a waterproofing membrane to prevent moisture infiltration behind tiles. If tiling around a bathtub, ensure the tub flange is accessible and the substrate is flat and plumb. For existing tubs, use a waterproof membrane up to at least the first row of tiles to protect the edge.

Tile Layout And Planning

Dry-lay tiles on the floor or a large sheet to confirm layout. Start with full tiles at the center of the longest wall for a balanced look, or begin at the tub edge for even coverage around the flange. Mark lines with a level and a chalk line to ensure straight grout lines. Plan for a clean transition at the tub edge with a vertical foam or cork bead installed behind the tile to create a rounded, water-tight edge. Decide where to place any decorative band or accent tile and how it interacts with doorways and fixtures.

Tile Cutting And Dry-Fitting

Use a tile cutter or wet saw to cut tiles for edges and around obstructions. For delicate channels around plumbing, score and snap or use a diamond wheel to avoid chipping. Dry-fit cut pieces to verify fit before applying adhesive. For tub fronts, you may need a trim piece or a bullnose edge to finish the exposed tile edges. Always wear eye protection and follow blade manufacturer safety guidelines during cutting.

Installing Tiles On Tub Surround

Apply thin-set mortar with a notched trowel suited to tile size. Work in small sections and comb the mortar to create even ridges, then press tiles firmly against the backer board. Use tile spacers to maintain consistent joints. Set large tiles with a sliding motion and a leveling system to prevent lippage. Periodically check for level and plumb. When tiling near the tub flange, ensure the first row is perfectly vertical to avoid gaps at the edges. Allow tile to set according to manufacturer recommendations before grouting.

Grouting And Finishing Touches

Mix grout to the recommended consistency and apply with a grout float, pressing into joints at a 45-degree angle. Remove excess grout and wipe with a damp sponge, rinsing frequently. After grout cures, seal the grout if using a cementitious grout type that requires sealing. Install silicone caulk along the tub edge and corners to prevent water intrusion; choose a color that blends with tile. Clean the tile surface and ensure all seams are smooth, with no gaps or high spots that could trap moisture.

Around The Edges: Waterproofing And Sealant Details

Pay special attention to the transition between tile and tub. Use a high-quality silicone or polyurethane sealant that remains flexible and mildew-resistant. Re-apply sealant as needed over time to maintain a watertight seal. If the tub is in a high-use shower area, consider an additional polyurethane sealant or clear sealant on top of grout to enhance moisture protection. For alcoves or niches, line with a waterproof membrane beneath tiles and seal all corners thoroughly.

Maintenance And Longevity

Routine cleaning with non-abrasive cleaners helps preserve grout color and tile shine. Inspect for grout cracks or missing sealant every 6–12 months and repair promptly to prevent water damage. If signs of moisture behind tiles appear, stop water exposure and re-evaluate the waterproofing system. With proper installation and ongoing maintenance, tiled tubs and surrounds provide durable, easy-to-clean surfaces for many years.

Tips For A Small Bathroom

• Choose lighter colors to visually enlarge the space.
• Opt for large-format tiles to reduce grout lines and maintenance.
• Plan an efficient layout to minimize cuts and waste.

Common Mistakes To Avoid

• Inadequate waterproofing behind tile in wet areas.
• Using the wrong mortar for wet environments or incorrect curing times.
• Failing to account for movement joints and expansion gaps.