One of the slickest systems we’ve seen to keep the area under an elevated deck dry is SpaceMaker decking. The 1-inch-thick tongue-and-groove deck boards are solid PVC with no fillers and an ASA cap. What keeps the water out is the decking’s Super Seal, a unique vulcanized silicone gasket that wraps around the tongue and is held in place via keyways (see illustration, below). When a deck board is installed, the patented gasket system, which the manufacturer claims is resilient from -100°F to 400°F, is compressed against the groove, preventing water from passing through; instead, water follows the channel between boards to the edge of the deck….
Author Credit: PROREMODELER
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