Wood Roof Decking Spans

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.

Wood roof decking spans.

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. Plywood is layers of wood. This arrangement is applicable to 4 or more supports 3 or more spans. 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.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors. 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. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks.

4 tongue and groove roof decking. All end joints occur in line on every other support figure 6.