What Plywood To Use For Roof Decking

One side is usually better quality than the other c in this case.

What plywood to use for roof decking.

The sole exception to this is pressure treated cdx which can survive for decades without even a protective coating. Do not use cdx for roofing sheds or other places that are exposed to moisture consistently. Required dimensions of plywood for roofing. Only use cdx plywood for the interior of a house where water damage is far less likely.

This kind of plywood can be used on roofs with minimal load. Most construction sites will consider the use of either osb or plywood for the roof. Foot and with a maximum of spacing of. In the first half of the 20th century roofs in missouri were built with wood shingles over planks spaced about 1 apart.

The industry offers a thickness of anywhere from 5 16 inch to inch. What size plywood should you use for your roof. Plywood typically comes in 4 8 ft. Use it indoors or outdoors but avoid using for framing permanent structures such as a shed or a home.

Steeper rather than flatter roofs will have lesser load per sq. Roof sheathing or decking is one of those elements. It should be placed up on the roof. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design.

It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. 5 ply is a versatile type of plywood that is about 4 millimeters thick. Look for something that s graded as exposure 1 or exterior. A is smooth and knot free while d the lowest quality has missing knots and cracks.

In addition to the thickness you also need to make sure that you choose plywood that s graded for outdoor use. The common grade of plywood for roof sheathing is cdx. This plywood is strong and durable enough for use in roofing framing and other exterior structural. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof.

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. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements. As a quick primer in plywood each side is rated from a to d.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. Sheet with varying thickness. Multi ply is a catchall term for plywood with seven or more plies.