Bentonite waterproofing is a natural and eco-friendly method used to prevent water from penetrating foundation walls, basements, and underground structures. The core material, bentonite clay, is formed from volcanic ash and primarily consists of the mineral montmorillonite. What makes this clay unique is its ability to expand up to 15 times its dry volume when it comes into contact wi... https://nymasonrypaving.com/water-proofing-foundation/