What type of membrane should I use under my bathroom tile?

For bathroom tile installations in Vancouver, you'll need a waterproof membrane system — either a liquid-applied membrane like RedGard or Aquadefense, or a sheet membrane like Kerdi or NobleSeal. The choice depends on your specific application, but liquid membranes are most common for typical bathroom renovations.

Liquid-Applied Membranes are the go-to choice for most Vancouver bathroom renovations. Products like Custom Building Products RedGard, Mapei Aquadefense, or Laticrete Hydro Barrier go on like paint and cure to form a seamless waterproof barrier. They're ideal for shower surrounds, tub surrounds, and bathroom floors. Application is straightforward — roll or brush on in thin coats, paying special attention to corners, penetrations, and transitions. Cost runs $3-5 per square foot for materials and application.

Sheet Membranes like Schluter Kerdi or NobleSeal offer superior protection for high-end installations or complex geometries. These fabric or plastic sheets bond directly to the substrate and provide excellent waterproofing, especially around niches, benches, and curbs. They're more expensive ($8-12 per square foot installed) but offer peace of mind for luxury renovations. The Kerdi system is particularly popular because it integrates with matching drains, corners, and trim pieces.

These factors make proper waterproofing even more critical here. Our 1200mm+ annual rainfall and high humidity levels mean bathroom moisture management is essential. The BC Building Code requires waterproof membranes in all shower areas and recommends them for bathroom floors. Many Vancouver contractors also extend membranes up walls beyond the minimum 6-inch requirement, especially in older homes where settling might create cracks.

Professional vs. DIY depends on your skill level and the project scope. Simple floor applications with liquid membrane can be DIY-friendly for experienced renovators, but shower surrounds require careful attention to corners, transitions, and penetrations. Any mistakes can lead to water damage behind tiles — expensive to repair and potentially affecting neighboring units in condos. Most Vancouver tile contractors include membrane installation in their quotes, and it's often worth the investment for proper application and warranty coverage.

Involve assessing your specific bathroom layout and choosing the appropriate system.