Roof Sheathing Plywood Or Osb

While a sheet of plywood might be 5 to 7 plies thick a sheet of osb is made from as many as 50 strand layers packed and compressed into the same thickness.

Roof sheathing plywood or osb.

Sheathing a 2 400 sq. 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. Roof sheathing or decking is one of those elements. Plywood is made with an odd number of layers for optimal strength and performance.

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. Osb boasts a more consistent density. 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.

Up until 2000 plywood held the majority of the market for wall roof and floor sheathing when it was surpassed by osb which as of 2018 held about 75 of the market share. Plywood subflooring 3 8 plywood plywood roof sheathing 3 4 plywood 4x8 3 4 sheathing plywood 48 24 sheathing plywood. Plywood is a bit more expensive but is usually stronger and is often selected in cases where the roof covering is heavier such as for slate clay or concrete tile roofs. 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.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Home at current prices would cost about 700 more with plywood than osb. Osb panels can be manufactured in lengths up to 16 feet or sometimes even higher while plywood is generally limited to 8 to 10 feet.