Osb Or Plywood For Roof Sheathing

Osb takes longer to get wet than plywood but also takes longer to dry out.

Osb or plywood for roof sheathing.

Building codes the engineered wood association architects and most builders rate plywood and oriented strand board obs sheathing equal in strength and durability. Osb is much more waterproof than plywood and cdx plywood. Both types of panels contain phenol formaldehyde in the adhesive osb also contains isocyanurate resin but neither contains the urea formaldehyde which is quite toxic to humans. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8.

Many contractors will use osb for roofing and subfloors. 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. For pricing and availability. With edge support and the same snow load 3 8 inch osb can be used.

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. There are even variants of osb that come with building wrap already in place so installation is as easy as taping the seams together. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8. Home at current prices would cost about 700 more with plywood than osb. When used as a roof sheathing this tendency to hold moisture means it can degrade faster than plywood when exposed to chronic leaks. 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.

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. Osb is now used for about 70 percent of all floor wall and roof sheathing in north america. For pricing and availability.

In 2001 oriented strand board surpassed plywood in terms of square footage produced. 2x greater shear strength than similar sized plywood source.