Osb Or Plywood For Roof Sheathing

Sheathing a 2 400 sq.

Osb or plywood for roof sheathing.

When osb does get wet it also tends to swell along the edges and those edges stay swollen even after the material has dried out. Plywood used for roof decking is typically called sheathing and. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot. Oriented strand board isn t plywood nor is it a type of particleboard fiberboard or wafer board and although it is a newcomer to a plywood dominated market its use for exterior sheathing is.

For pricing and availability. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8. Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8. 2x greater shear strength than similar sized plywood source.

Typical types of wood used 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. Osb is now used for about 70 percent of all floor wall and roof sheathing in north america. The most common materials for this are oriented strand board osb or plywood both formed of layers of wood bonded into a panel.

University of massachusetts meets most building codes for roof and wall sheathing. Many contractors will use osb for roofing and subfloors. Osb takes longer to get wet than plywood but also takes longer to dry out. Today you can find osb in thickness from 7 16 to 1 1 8 for different applications from roof wall subfloor i joists and everything between.

In 2001 oriented strand board surpassed plywood in terms of square footage produced. When used as a roof sheathing this tendency to hold moisture means it can degrade faster than plywood when exposed to chronic leaks. Building codes the engineered wood association architects and most builders rate plywood and oriented strand board obs sheathing equal in strength and durability. Home at current prices would cost about 700 more with plywood than osb.

Osb is much more waterproof than plywood and cdx plywood. When building a house osb makes for excellent sheathing.