Many homeowners are surprised to learn that tile and grout are not waterproof. Grout is porous, and water that gets behind the tile can rot walls, grow mold and damage the floor below. That is why waterproofing is the most important step in any shower project.
What a waterproofing membrane does
A waterproofing membrane is applied over the shower walls, pan and curb before tile goes on. It creates a continuous barrier that sends any water that gets through the grout down to the drain instead of into your walls.
Where it goes
- Shower walls, at least up to the shower head height
- The shower pan and curb
- Around niches, benches, valves and the drain
- Inside corners and seams, reinforced with fabric or corners
Slope to the drain
A correctly sloped shower floor keeps water from pooling. With large tiles, we often recommend a linear drain so the floor slopes in one direction.
Signs your current shower is not waterproofed
Loose or hollow-sounding tiles, cracked grout that keeps coming back, musty smells and stains on the ceiling below are all warning signs.
Planning a new shower or a bathroom remodel? Learn more about our bathroom and shower tile installation and get a free estimate.