Delta-Floraxx from Cosella-Dörken Products is a perforated drainage board for use in green-roof assemblies. Made from 60% recycled high-density polyethylene, the membrane features 20-mm-high octagon-shaped dimples to retain rainwater, holding up to 21.98 fluid ounces per square foot. Surplus water then drains through perforations and between dimples to an open-channel system under the dimple sheet. The board comes in rolls measuring 6.6′ by 65′. cosella-dorken.com; 888.433.5824.
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