Composite Decking Span Chart

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Simply follow the chart below.

Composite decking span chart.

To learn more about deck joist sizing spacing and allowable span reference this chart. For timbertech azek decking it s recommended to have a minimum 1 8 to 1 4 side to side gap between deck boards. Proper side to side deck board spacing allows for air water and debris to flow around the decking leading to a long lasting low maintenance deck. For example joists spaced 16 inches from the center of the joist next to it can span 1 5 times in feet the depth of their inches.

But let s first explain what the numbers in the chart actually mean because it can be a bit confusing. See the deck post size table to make that determination because it will affect the size of beam you choose. Expansion joints in buildings. Also many composite decking materials require 12 or even 10 on center stair stringers spacing to support composite stair treads.

Your selection of decking material will determine the maximum spacing of your joists. Composite deck 11 2 inch depth 36 inch coverage 7 foot to 12 foot optimal span range pan perforated acustadek option available with smooth series rivet attachments or welded aesthetic flat pan underside meets sdi 1 5wr standard profile requirements 3wxh 36 hi form 3wxhf 36 hi form composite deck 2 inch nominal depth 36 inch coverage. Ready to start calculating how much lumber you ll need for your joists. The deck beam span table on this page makes it easy to determine how far apart your posts and therefore the span of the beam should be.

Nubim vulcraft add in for revit software. But you ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers. As a rule the larger the deck the larger the joists. The majority of composite deck board brands including trex timbertech and more require deck joists spacing to be at 16 inches o c.

Some brands like weardeck let you get away with more reinforced with a layer of fiberglass on both the top and bottom weardeck boards easily allow for spans of 24 inches oc. Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc. Read on and learn a little bit about what affects your decking s strength like material and joist spacing. Most composite decking materials like trex composite decking require minimum joist spacing for composite decking at 16 on center spacing for straight decking and 12 on center joist spacing for 45 degree angle diagonal decking.

The decking span you choose will affect the feel and potentially the safety of your deck. Composite decking brands also generally require 12 inches o c joist spacing for 45 degree or angled composite deck board applications. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span.

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