Wood Roof Decking Spans

4 tongue and groove roof decking.

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. This arrangement is applicable to 4 or more supports 3 or more spans. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. Deck beam span table deck joist span table deck joist rule of thumb deck porch construction structural fasteners deck porch post beam connectors.

All end joints occur in line on every other support figure 6. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors. 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 pieces are supported on three supports.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 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.