Step 4: Waterproofing: the part you *won’t* see (but it matters most)

By Cali Dream Construction | January 09, 2026 | San Diego

Tile is not waterproof. Grout is not waterproof. A shower’s performance comes from the waterproofing system underneath.

A properly built shower typically includes:

• correct slope toward the drain

• a waterproofing system (membrane or equivalent)

• careful sealing at penetrations (valves, niches, benches)

• attention to transitions (floor-to-wall, curb details, corners)

If you’re creating a “wet room” feel, waterproofing details become even more critical.

The best approach is to treat waterproofing as a system, not a random combination of products.