Roof Decking Thickness 6 Oc

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.

Roof decking thickness 6 oc.

706 7 when a roof covering on an existing site built single family residential. In the first half of the 20th century roofs in missouri were built with wood shingles. The typical thickness range for sheathing is 3 8 to 3 4 inch. Based on standard 16 oc joist spacing and type of material this may be the minimum allowable thickness.

Structures that already comply are exempt from this requirement i e. Controlled random layup two inch decking. This is the most common decking board sold. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.

Permitted under the 2004 code or newer. 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. Sheathing should be a minimum of 19 32 inch thick. 2017 fbc building 6 th edition 23 wood 2304 general construction requirements 2304 8.

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. 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. End joints in 2 in. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

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. Never attach roof sheathing with staples. Deck re nailing fbc existing building section 706 7 establishes the requirement that the roof decking is to be re nailed.