Osb Or Plywood Base Under Metal Roof

Table 2304 7 3 gives the 7 16.

Osb or plywood base under metal roof.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Moisture also affects the strength of plywood. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. We ll discuss plywood vs osb more later.

So while exterior glued plywood can be used outdoors it works best. While osb oriented strand board is generally cheaper than plywood it is heavier and not as stiff as plywood and can result in soft squeaky floors under weight the biggest complaint against osb is that it doesn t handle moisture very well so it is more suited for indoor use. Thicknesses range from 5 16 to 3 4 inch and the proper. Metal roofing roofing answers roofing installation roofing materials oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands.

Speaking of osb it s a top choice of homeowners looking for something more affordable than plywood. From the 2012 ibc international building code table 2304 6 1 over framing spaced 24 inches on center 7 16 osb fastened with 8d common nails six inches on center at the edges and in the field will support a maximum design wind speed vult of 110 mph miles per hour in exposure b or 90 mph in exposure c. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. April 3 2017 filed under.