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A durable, flexible and non-deteriorating material, installed in a continuous sheet to retard the pressure-driven flow of soil gas through elements of a structure.
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Related Code Sections

E302 Florida Standard for Radon-Resistant New Commercial Construction, Soil Gas-Retarder Membrane.
Acceptable soil gas-retarder membranes shall consist of a single layer of polyethylene, not less than 0.006-inch (6 mils) thick with a maximum perm ...
E402.2 Florida Standard for Radon-Resistant New Commercial Construction, Soil Cover
In slab-on-grade construction, the soil cover consists of the soil gas-retarder membrane and the concrete slab. In crawl spaces, the concrete slab ...
E302.10 Florida Standard for Radon-Resistant New Commercial Construction, Repairs
Where portions of an existing slab have been removed and are about to be replaced, a soil-gas-retarder membrane shall be carefully fitted ...