How thick should roof boards be?

Typically 3/4″(18mm) for floors and 3/8″ (9mm) for walls and 1/2″ (11mm) roof. Also make sure that you get your supporting timbers at the correct spacing.

What is the minimum thickness for roof decking?

Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Sheathing should be a minimum of 19/32-inch thick. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. The typical thickness range for sheathing is 3/8 to 3/4 inch.

How thick is a roof?

Standard roof sheathing consists of 4-by-8 plywood or oriented strand board, or OSB. It is 1/2-inch thick and attaches to the roof rafters or trusses. An exception may occur if you intend to install slate, concrete or tile shingles. To support the added weight, you need to install 5/8 inch roof sheathing.

Is 7/16 OSB OK for roof?

OSB is the most common choice for roof sheathing because of its flexibility and low price point. This is because plywood tends to require thicker roof decking compared to OSB. The most common roof sheathing thickness is 7/16″. 7/16″ is durable and maintains building integrity much longer than other sizes.

How thick should OSB board be for roof?

Standard roof sheathing thickness is ½” to ⅝” thick. If you are using OSB for your roof deck, then ⅝” is the recommended thickness. For plywood, which is slightly stronger than strand board, ½” thick is appropriate. Another factor is how far apart your trusses or rafters are spaced.

Can you use screws on OSB?

You only need a #8 wood screw that is 1 1/2 inches long for 5/8 inch OSB or at most 2 inches long for 3/4 inch plywood. Also, deck screws have a coating that helps protect the screw from exterior exposure, which is not needed indoors. Deck screws will also cost more than the screws needed for your subflooring.

Can plywood be used for roofing?

Most Common Thickness For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. It will support roof loads for most situations and is the standard for most roof applications.

Can 3/8 OSB be used for roofing?

Standard types of wood designed for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. With edge support and the same snow load, 3/8-inch OSB can be used.

How thick should roof plywood be?

3/8 inch
Most roofs will be sheathed in plywood at least 3/8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the pitch of the roof; the flatter the roof, the greater the load on any one section. Steeper roofs will have lighter loads per square foot.

What plywood is used for roofing?

CDX is the grade of plywood most commonly used for roofing (CDX plywood means it is Construction Grade for exterior purposes).

What’s better plywood or OSB?

Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood. This is one of the reasons osb is used for webs of wooden I-joists.