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Vapor Barrier and slab foundations

Vapor Barrier and slab foundations

Vapor Barrier and slab foundations

(OP)
Vapor barrier are manufactured from plastic material that tend to be smooth. When the material is places between concrete and the ground surface there is no doubt there is a reduction in friction. In structures where there is risk of sliding the reduction in surface friction becomes a concern.

Are there any research papers quantifying the loss of friction when vapor barriers are used?

RE: Vapor Barrier and slab foundations

Plastic is not placed below the foundation except in a thickened edge slab, which should not be used if the entire building is subject to sliding.

Plastic is intended to provide a vapor barrier and help with shrinkage cracking by reducing friction restraint for slabs on grade, not the foundation.

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