Damp & Leaking External Wall Solutions

Dampness on inside walls after driving rain, efflorescence (white salt patches), blistering paint on the weather-facing wall — external walls absorb water through pores and hairline cracks long before you see a leak.

This collection covers penetrating silane-siloxane repellents that work invisibly inside the pore structure, and transparent protective coatings for stone and masonry. They keep the wall breathable while blocking driving rain.

Cracks wider than hairline? Fill them first — see crack repair. Building new? Waterproof the plaster from inside the mix with an integral admixture.