Concrete Slab Curling Over Vapor Retarders

Concrete Slab Curling Over Vapor Retarders

Submitted by Dennis Keane, Stego Industries, LLC for publication by CSI 6/12/2017
Posted with permission from the American Concrete Institute ( in September, 2016.

We have always been told that concrete slabs placed directly on a vapor retarder curl more than slabs cast directly on a prepared base. However, we recently measured a slab that we know had a vapor barrier only in limited areas. The portions cast oyer the vapor retarder had less curling than those cast directly on the base. What is the current industry understanding of this issue?

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