How Thick Is Roof Decking

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

How thick is roof decking.

Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. In this case you can t use a 3 8 inch thick sheet. Osb roof decking thickness 7 16 1 2 or 5 8. 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.

The thickness of plywood used for roof decking depends on the roof slope the spacing of. 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. Most roofs are spaced at least 20 inches apart. 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.

The typical thickness range for sheathing is 3 8 to 3 4 inch. When it s too thin. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. Many factors affect thickness.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. 8d ring shank nails should be used instead. Plywood is made with three or more layers of thin wood glued together with the grain. What is plank sheathing.

Keep the 16 oc go with 1 2 osb and add an extra clip in each space. 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. Flexural strength can be assumed to be 33ksi unless a new single ply system is contemplated that requires a higher pull out strength. Never attach roof sheathing with staples.

In that case a pullout test device can confirm adequacy. Sheathing should be a minimum of 19 32 inch thick. The minimum plywood for roofing plywood is layers of wood.