Roof Decking Thickness 6 Oc

This is the most common decking board sold.

Roof decking thickness 6 oc.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. If the plywood thickness is less than or the osb less than 7 16 it is going to be weak with the roof rafters spaced the standard 2 on center. End joints in 2 in. Sheathing should be a minimum of 19 32 inch thick.

Permitted under the 2004 code or newer. Structures that already comply are exempt from this requirement i e. What is plank sheathing. Eight quarter or 8 4 or 2x e g 2 x 6 2 x 4.

Nominal thickness decking not oc curring over supports when random length pieces are used shall a be matched tongued and grooved or b have metal splines inserted at ends so that loads may be distributed from end to end as well as across the planks. In the first half of the 20th century roofs in missouri were built with wood shingles. We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7 16 osb decking. 706 7 when a roof covering on an existing site built single family residential.

Deck re nailing fbc existing building section 706 7 establishes the requirement that the roof decking is to be re nailed. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 2017 fbc building 6 th edition 23 wood 2304 general construction requirements 2304 8. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.

Osb roof decking thickness 7 16 1 2 or 5 8 currently we space rafters 16 oc and use 7 16 osb with h clips. The typical thickness range for sheathing is 3 8 to 3 4 inch. 8d ring shank nails should be used instead.