Sodium bentonite based waterproofing systems have steadily gained in popularity for below-grade application for both blindside and positive side construction. Although bentonite is in many household products, it has become one of the more versatile waterproofing materials available on the market today. Bentonite has many applications that include:
- Under slab
- Zero property line (blindside) construction
- Back-filled walls
- Earth-covered structures
- Split-slab deck construction
- Hydrostatic and non-hydrostatic site conditions
There are many manufacturers who offer a variety of bentonite waterproofing systems. Some of these product variations include standard bentonite sheet with a high-density polyethylene (HDPE) waterproofing membrane for repelling water or a multi-layer (bentonite, HDPE, and woven fabric) sheet membrane combination for repelling water and gas. The multi-layer sheet membrane is designed for use with shotcrete and cast-inplace concrete applications.