07 17 00 Bentonite Waterproofing

07 17 00 Bentonite Waterproofing

Specification Details




8.5" x 11"


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07 17 00

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Bentonite Waterproofing

Use this CSI 3 part SimpleSpecs™ master specification to specify bentonite waterproofing geosynthetic sheet, panelized, or composite sheet form, for use as below-grade, underslab, and split slab construction.


Waterproofing incorporates bentonite clay which absorbs water until it is fully saturated, at which point no water will pass through.the clay. Composite bentonite waterproofing incorporates both bentonite clay and a prefabricated waterproof sheet.


In geotextile sheet form bentonite waterproofing consists of bentonite clay between two geotextile fabrics. Since it conforms to irregular surfaces it is useful for waterproofing against excavations and lagging but is also used for traditional below-grade and underslab applications.


Waterproofing in panel form places the bentonite inside corrugated cardboard panels that are mechanically fastened to vertical surfaces or placed loose over a mud slab or prepared subgrade in underslab applications.


Composite bentonite waterproofing combines bentonite clay that is factory applied to an HPDE waterproofing sheet.


Since bentonite swells when it becomes wet it can exert tremendous pressure on overlying slabs and adjacent construction. Consult with a manufacturer when considering waterproofing for these applications.


This waterproofing requires a protection course to prevent damage during backfilling and placement of overlying construction. A drainage course applied over the waterproofing reduces hydrostatic pressure, thereby reducing the possibility of leaks. Some drainage boards can also act as the protection course.


Related Association:

Industrial Minerals Association – North America


Related SimpleSpecs™ master specifications:

07 13 13 – Bituminous Sheet Waterproofing

07 14 13 – Hot Fluid-Applied Waterproofing

07 14 16 – Cold Fluid-Applied Waterproofing

07 16 16 – Crystalline Waterproofing



Bentonite Waterproofing

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