How Thick Is Roof Decking

Plywood is made with three or more layers of thin wood glued together with the grain.

How thick is roof decking. What is plank sheathing. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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. 8d ring shank nails should be used instead.

The minimum plywood for roofing plywood is layers of wood. Most roofs are spaced at least 20 inches apart. Sheathing should be a minimum of 19 32 inch thick. The thickness of plywood used for roof decking depends on the roof slope the spacing of.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. In that case a pullout test device can confirm adequacy. When it s too thin. Never attach roof sheathing with staples.

Once the spacing hits 24 inches a 5 8 inch thick sheet is more ideal. The typical thickness range for sheathing is 3 8 to 3 4 inch. 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. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof.

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. For this you can either go for a half inch or 5 8 inch thick sheet. Many factors affect thickness.

Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. 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. Keep the 16 oc go with 1 2 osb and add an extra clip in each space.