Roof Sheathing Thickness 16 Oc

1 inch 25 4 mm.

Roof sheathing thickness 16 oc.

For subfloors zip s 1 2 in. Sheathing should be a minimum of 19 32 inch thick. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. What about the roof sheathing at 24 in.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Currently we space rafters 16 oc and use 7 16 osb with h clips. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. That means it can be used at 24 in. I m contemplating upgrading to 1 2 or even 5 8 osb though to reduce roof sag hopefully to nil. Panels are rated 32 16.

For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. The typical thickness range for sheathing is 3 8 to 3 4 inch. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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.

Huber s zip system sheathing which we are using on the fhb house has a span rating of 24 16 for 7 16 in. Secure roof sheathing panels to the roof framing with 8d common nails spaced six inches on center at the edges and twelve inches on center at intermediate supports. 8d ring shank nails should be used instead.