How Thick Is Roof Decking

Flexural strength can be assumed to be 33ksi unless a new single ply system is contemplated that requires a higher pull out strength.

How thick is roof decking.

Roof sheathing standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. When it s too thin. Keep the 16 oc go with 1 2 osb and add an extra clip in each space. In this case you can t use a 3 8 inch thick sheet.

Most roofs are spaced at least 20 inches apart. 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. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Once the spacing hits 24 inches a 5 8 inch thick sheet is more ideal. 8d ring shank nails should be used instead. For this you can either go for a half inch or 5 8 inch thick sheet. For example a 26 gauge steel panel can range between 0 0179 and 0 0217 inches thick according to a university of north carolina at chapel hill resource.

Many factors affect thickness. Never attach roof sheathing with staples. What is plank sheathing. Sheathing should be a minimum of 19 32 inch thick.

The minimum plywood for roofing plywood is layers of wood. 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. The thickness of plywood used for roof decking depends on the roof slope the spacing of. Thickness of a steel roof deck can be determined at a roof hatch where the edge of the deck may be available for measurement with a micrometer.

In that case a pullout test device can confirm adequacy. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.