Some composite decking materials are designed to be installed with hidden fasteners. These clip systems generally are screwed into to the deck frame across each joist and fit tightly into a cavity running down the side of the boards. In most climates, temperatures fluctuate enough to cause an issue with how the decking is spaced from summer to winter. Composite decking tends to grow and shrink across the length of the boards as it heats and cools. Proper spacing will allow some movement without buckling. Doing so will ensure that you get the best-looking and lasting deck.It is very important to follow the manufacturer’s instructions when installing composite decking material. Thermal expansion is always something to be aware of when dealing with plastics. With composite decking, it is important to adhere to the recommendations of the brand’s instructions. A good rule of thumb is ¼” to 1 1/2″ for most decks. The amount you overhang should be determined by design, material, and the brand of composite used. As well as preventing damage to the fascia board and reducing potential splintering of wood deck boards. Overhanging deck boards offer a cosmetically pleasing finish to your deck. Even better if you have stairs, keep it consistent with the stair nosing and go with a 1″ overhang. This will offer greater support and longevity to the deck board. The maximum overhang for a 2×6 deck board is 2″.īut you are better off limiting the overhang to 1 1/2″. Along with differences between the ends and the edge of the board. Each brand’s design and material limit how much they can overhang. For all the same reasons, we overhang wood decking.īut do check the brand’s limit. But yes, you can overhang most brands of composite decking. You can probably guess from my previous answer. To save going through each brand here, click the link for a handy guide and article about acceptable composite decking overhangs by brands. Composite decking: 0″-2″, but most are 1”īut with a few exceptions, most composite decking should have an overhang of less than 1″. Not only will design determine the ideal overhang but also decking material.Ī solid 2×6 pressure-treated spruce board can easily overhang 2″ without breaking, but cosmetically smaller would be better. This range offers enough material for a good finish but not so much as to cause potential problems like sagging or splitting. When considering your deck’s design and amount of overhangs, a good rule of thumb is ¼” to 1 ¾”. How Much Overhang Should a Deck Board Have? The wood fibres after the screw help hold the decking together and prevent further splitting. Overhanging the decking provides this necessary material. This is because the wood’s elasticity allows it to stretch around the screw without cracking, but there must be enough material in the decking to bring it back together after the screw is in place. It is important to note that these splits usually occur at the ends of the boards rather than the middle. Many decks have been weakened or destroyed due to splits in the wood deck boards. Overhanging decking helps wood decking to splits less
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