Osb Or Plywood For Roof Sheathing

For pricing and availability.

Osb or plywood for roof sheathing.

With edge support and the same snow load 3 8 inch osb can be used. The most common materials for this are oriented strand board osb or plywood both formed of layers of wood bonded into a panel. When used as a roof sheathing this tendency to hold moisture means it can degrade faster than plywood when exposed to chronic leaks. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

University of massachusetts meets most building codes for roof and wall 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. Building codes the engineered wood association architects and most builders rate plywood and oriented strand board obs sheathing equal in strength and durability. There are even variants of osb that come with building wrap already in place so installation is as easy as taping the seams together.

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. Osb is much more waterproof than plywood and cdx plywood. Many contractors will use osb for roofing and subfloors. When building a house osb makes for excellent sheathing.

Sheathing a 2 400 sq. Osb is now used for about 70 percent of all floor wall and roof sheathing in north america. Osb takes longer to get wet than plywood but also takes longer to dry out. 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.

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. For pricing and availability. Home at current prices would cost about 700 more with plywood than osb.

In 2001 oriented strand board surpassed plywood in terms of square footage produced. 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.