Shower waterproofing in Miami
Almost every failed shower we are called to look at failed in the same place: behind the tile. Tile and grout are not waterproof. The layer underneath is, and in Florida that layer is the difference between a bathroom that lasts and one that grows mold in three years.
What proper shower waterproofing looks like
We use a membrane or liquid system across the entire enclosure, not just the shower floor: Schluter Kerdi, RedGard or Hydro Ban depending on the build. Corners, seams, changes of plane and every screw penetration get sealed, because those are the points that actually leak.
Pre-slope, then the pan
Water has to reach the drain. A pan built flat and then sloped only at the surface traps water underneath it permanently. We build the slope into the base before the waterproofing goes on, so the water sitting inside the assembly still runs out. That base is rebuilt from scratch on every tub to shower conversion, and on a curbless walk-in shower installation the floor is recessed and the slope planned before anything is poured.
The flood test
Before a single tile is set, we plug the drain, fill the pan, and leave it. If the level drops, something is wrong and we find it while it is still cheap to fix. Tiling over an untested pan is the industry habit that produces the leaks nobody can trace two years later.
Why Florida is different
Humidity means the assembly never fully dries out between uses. A wall that would have survived a marginal detail in a dry climate stays damp here, and damp plus organic material behind tile is how mold starts. That is why we treat this stage as the one that is never negotiable.
Signs your current shower is failing
- Loose or hollow-sounding tiles, especially near the floor
- Grout that keeps cracking in the same corner
- A musty smell that does not clear with ventilation
- Staining on the ceiling or wall of the room below
If you are seeing any of those, the fix is usually a rebuild rather than a patch. We will tell you honestly which one you are looking at. See the stages we work through, or ask in the chat.