What Plywood To Use For Roof Decking

What size plywood should you use for your roof.

What plywood to use for roof decking.

This kind of plywood can be used on roofs with minimal load. Sheet with varying thickness. Roof sheathing or decking is one of those elements. Multi ply is a catchall term for plywood with seven or more plies.

Plywood typically comes in 4 8 ft. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. This plywood is strong and durable enough for use in roofing framing and other exterior structural. In the first half of the 20th century roofs in missouri were built with wood shingles over planks spaced about 1 apart.

As a quick primer in plywood each side is rated from a to d. Use it indoors or outdoors but avoid using for framing permanent structures such as a shed or a home. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. The minimum thickness of plywood used for roofing is 3 8 th of an inch.

What plywood should you use for a roof. The sole exception to this is pressure treated cdx which can survive for decades without even a protective coating. X stands for exterior use. The industry offers a thickness of anywhere from 5 16 inch to inch.

It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. Only use cdx plywood for the interior of a house where water damage is far less likely. Wood shingle are expensive so when these roofs need to be torn off and replaced it is cheaper to resheath the entire roof and go over it. Required dimensions of plywood for roofing.

It should be placed up on the roof. Look for something that s graded as exposure 1 or exterior. 5 ply is a versatile type of plywood that is about 4 millimeters thick. Most construction sites will consider the use of either osb or plywood for the roof.

In addition to the thickness you also need to make sure that you choose plywood that s graded for outdoor use. Steeper rather than flatter roofs will have lesser load per sq. Foot and with a maximum of spacing of. The common grade of plywood for roof sheathing is cdx.

One side is usually better quality than the other c in this case. The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. A is smooth and knot free while d the lowest quality has missing knots and cracks. Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements.