Cost to Waterproof a Shower Before Tiling
Waterproofing a shower before tiling involves fastening cement board or waterproof backer board to the studs, sealing every seam, corner, and screw head, then applying a liquid membrane. The careful parts are creating a flat backer-board surface, caulking the joint at the shower pan, and covering the full wall surface and pan lip before tile goes on.
- Silicone sealant2.53 tube @ $12$30
- Waterproofing Membrane126.5 sq ft @ $2$253
- Supplies subtotal$215–$418
- Labor$578–$1,023
- Permits & fees$85
Based on 115 sq ft (typical size). Figures are ballparks — get a contractor quote to confirm.
Common reasons homeowners do this job
- Preparing a shower for new tile
- Replacing worn or damaged shower wall materials
- Updating a bathroom as part of a renovation
- Creating a moisture-tight barrier before installing tile
- Replacing backer board before a shower tile project
DIY or call a pro?
This is a legitimate DIY project for a homeowner who is comfortable installing backer board, sealing seams and screw heads, and applying a liquid membrane over the wall surface and pan lip. Consider a professional if any of those steps feel uncertain. Wear protective eyewear and a dust mask when cutting cement board, and keep the bathroom properly ventilated while using liquid membranes and sealants.
Frequently asked questions
- Can I waterproof a shower myself before tiling?
- Yes, this is a DIY-friendly job. Start by checking that the wall studs are level and plumb, since the backer board needs a flat surface. A professional is worth considering if installing board on studs, sealing the shower-pan joint, or applying the membrane over the full wall area feels outside your comfort level.
- What makes shower waterproofing cost more?
- The price scales with the shower's size, labor time, and the materials selected, including backer board, waterproof tape, mortar or thin-set, sealant or caulk, and liquid membrane. Removing old material can add haul-away or disposal, while a small shower project may still involve a minimum or trip charge.
- Where does the waterproofing membrane need to go?
- Apply the liquid waterproofing membrane over the entire shower wall surface and the pan lip. Before that, waterproof tape covers the board seams and corners, mortar or waterproof sealant covers seams and screw heads, and caulk seals the seam between the shower pan and backer board.
- What should I do before installing cement board in a shower?
- Measure the shower area so there is enough cement board and waterproofing material, then inspect the studs for level and plumb. Protect the existing tub or shower pan with plywood or another protective cover before installation. Let the membrane dry completely according to its manufacturer instructions before tiling.
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