07 17 00 Bentonite Waterproofing

07 17 00 Bentonite Waterproofing

Specification Details




8.5" x 11"


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Unlimited Projects


07 17 00

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Bentonite Waterproofing

Use this CSI 3-part SimpleSpecs™ master specification to specify panelized or composite sheet form bentonite waterproofing at below-grade, under the slab, and split slab construction.


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


In geotextile sheets, bentonite waterproofing consists of bentonite clay between two geotextile fabrics.


The sheet conforms to irregular surfaces to become useful for waterproofing against excavations and lagging.  Also used for traditional below-grade and under-slab applications.


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


Composite bentonite waterproofing combines bentonite clay factory pre-applied to an HPDE waterproofing sheet.


Since bentonite swells, it can exert tremendous pressure on overlying slabs and adjacent construction when it becomes wet. 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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