As water becomes trapped between the boards with nowhere to go but feed the fungi eating away at the joist. I have torn many decks apart, and whenever you have two boards sandwiched together, the chances of rot is almost guaranteed. Without the decking overhanging the fascia board, water becomes trapped between the rim joist and the fascia board. Especially if you install composite fascia board to the rim joist. It may not seem like much, but it does make a difference. Limiting water exposure helping to keep your substructure dry and rot free. Structural Reasons to Overhang Composite Deckingįirst, hanging the decking past the edge joist, water is lead off and away from the joist. Overhanging deck makes your deck look better and increases the life of the deck. There are two big reasons to overhang composite decking. Overhanging both the front and sides of the deck consistently.Īllowable Composite Decking Overhang by Brands Brands Board Edges Board Ends DuraLife 2” (50mm) 2” (50mm) Calimboo 5/8” (15mm) 5/8” (15mm) Envision Not Permitted Not Permitted Moisture Shield ¾” (18mm) 1 ½” (38m) Trex ¾” (18mm) ½” (12mm) TimberTech 1” (25mm) non-scalloped 1” (25mm Verandadeck 1 ½” (38m) 1 ½” (38m) Composite Decking Overhang Limitations by Brands This is especially true with scalloped decking boards.įor consistency, whichever is the smallest between the two, you will want to overhang the decking. There are two areas of composite decking with overhang limitations, the ends and the edges. What are the manufacturers ‘ limits to composite decking overhang? Unlike wood decking, composite decking overhang is determined by the manufacturer’s, which varies between brands and composite decking lines. Most composite decking should overhang the deck’s substructure ¾” (18mm) but may be limited to only a 1/2″ (12mm) or as great as a 1 ½” (38mm). Overhanging composite decking is an important element to the deck’s design for aesthetic reasons and protection of the deck’s substructure. Also, composite decking overhang helps to increase the life of the deck by diverting water. The decking overhang creates consistency in the overall deck appearances and hides many inconsistencies between the decking and deck’s substructure. Just like traditional wood decking, composite decking should overhang the edge of the deck.
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