Wood Roof Decking Spans

4 tongue and groove roof decking.

Wood roof decking spans.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. This tongue and groove decking combines appearance grade with unsurpassed quality of finish making them ideal for exposed ceiling applications. Steel post cap connectors plywood post to beam cleats other connectors deck porch railings code requirements safety deck framing tables codes specifications questions answers about allowable spans for deck floor or porch framing.

All end joints occur in line on every other support figure 6. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors. Tongue and groove decking provides the customer with an outstanding solution for roof and subfloor structure where exposed to the lower level. For combination simple span and two span continuous multiply by 1 31 for two span continuous multiply by 1 85 loads shown are for dry use conditions multiply by 9 for wet service factor conversion factor to determine the board footage of decking required multiply the square footage of the roof area to be covered by a factor of 2 40.

This arrangement is applicable to 4 or more supports 3 or more spans. Also available for the android os. Standard structural decking patterns are 2 nominal tongued and grooved t g and 3 and 4 double t g products available with vee or eased edges to meet discriminating architectural requirements. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

Plywood is layers of wood. All pieces are supported on three supports.