**Assess your substrate condition before applying any waterproofing membrane.** Clean surfaces must be structurally sound, free of dust, oils, and loose particles—any contamination creates a barrier between membrane and stone, leading to delamination and eventual water intrusion. For natural stone installations in showers and wet areas, this preparation step determines whether your waterproofing lasts five years or fifty.
**Apply liquid or sheet membranes in multiple thin layers rather than one thick coat.** Building up waterproofing gradually—typically two to three coats with drying time between applications—ensures complete …
