The most commonly used OSB size for roofing is 7/16-inch OSB. It’s slightly smaller than 1/2-inch roof sheathing and considered the absolute minimum where rafters/trusses are spaced 24″ O.C. However, you can use other OSB sizes depending on your location and how far apart you space trusses or rafters.
What is the actual thickness of 7/16 OSB?
Oriented Strand Board (Common: 19/32 in. x 4 ft. x 8 ft.; Actual: 0.578 in.
Why is 7/16 OSB so expensive?
Increasing OSB prices are due to demand over supply, increasing construction starts, and several natural disasters. As contractors, architects, and building owners struggle to offset the high OSB prices, an excellent alternative sheathing product to consider is Barricade Thermo-Brace.
Is OSB stronger than plywood?
Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood. This is one of the reasons osb is used for webs of wooden I-joists. However, nail-holding ability controls performance in shear wall applications.
Can I use 7/16 OSB for wall sheathing?
Fred S. The 24/16 rating of 7/16″ OSB will pass code for any standard construction (walls &roof). You don’t need to worry about that. That is the job of the contractor and inspector.
Can I use 7/16 OSB for subfloor?
Oriented strand board, or OSB, is a wood structural panel that can also be used for flooring. It is made from shredded strands of wood pressed together with wax and a special adhesive, then hot pressed into a panel with up to 50 layers of strands. OSB can be used for subfloors, although it is not as common as CDX.
Can 7/16 OSB span 24 inches?
Wall panels 7/16 Category may be used on studs spaced up to 24” o.c.
Why is OSB so expensive?
OSB is expensive because it takes a long time to expand lumber mills and increase their supply output.
Is OSB board waterproof?
As a general rule, most OSB are water resistant. Due to their construction process using wood strands, resins and wax they come fairly water resistant. However, if you’re looking for a truly waterproof OSB you need to make sure it is stamped stating so.
What size OSB is used for roofing?
Standard types of wood designed for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. Sheets of 7/16-inch thick, without edge support, can be used in an area where the snow load is 30 pounds per square foot.
Can I use 7/16 OSB for attic?
Many new homes around here have trusses 24 on center, most of the attic floors are double thickness OSB (7/16) when furnaces and water heaters are present. Some have single 7/16 OSB spanning 24″ where the attic is only for storage. The access on all examples is folding stairs or ceiling scuttles.
Which side of OSB goes down?
OSB also has stamping that reads “This Side Down”. This directs the worker on the correct orientation of the board when installing. The side with the stamp is the smoother side. When installed smooth side down, the rough surface will then face up and give the worker traction for safety.
What does green OSB mean?
More accurately, I should have reported that OSB is green because it’s made from a variety of “fast-growing and relatively small trees,” according to the Web site of the Louisiana-Pacific Corp.,
Is OSB cheaper than plywood?
OSB is less expensive than plywood. To build a typical 2,400-square foot home, OSB may cost $700 less than plywood. OSB is considered by many to be a “green” building material because it can be made from smaller-diameter trees, such as poplars, that are often farmed.
Why is OSB going back up?
That supply decline is simply outmatched by high demand from builders who are still selling homes faster than they can build them. As prices started to spike late last year, suppliers and homebuilders responded by increasing their lumber orders.
