How Thick Is Roof Decking

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.

How thick is roof decking.

In that case a pullout test device can confirm adequacy. Once the spacing hits 24 inches a 5 8 inch thick sheet is more ideal. 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.

Keep the 16 oc go with 1 2 osb and add an extra clip in each space. 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. Plywood is made with three or more layers of thin wood glued together with the grain.

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. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. Many factors affect thickness. In this case you can t use a 3 8 inch thick sheet.

Most roofs are spaced at least 20 inches apart. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks. Flexural strength can be assumed to be 33ksi unless a new single ply system is contemplated that requires a higher pull out strength. The typical thickness range for sheathing is 3 8 to 3 4 inch.

8d ring shank nails should be used instead. What is plank sheathing. The thickness of plywood used for roof decking depends on the roof slope the spacing of. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

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 minimum plywood for roofing plywood is layers of wood. For this you can either go for a half inch or 5 8 inch thick sheet.