Is Osb Good For Roof Sheathing In 7 16

That in a nutshell is the one big advantage plywood holds over osb.

Is osb good for roof sheathing in 7 16.

University of massachusetts meets most building codes for roof and wall sheathing. 7 16 osb with a span rating of 24 16 is only good for re roofing your house. With edge support and the same snow load 3 8 inch osb can be used. However there is a common reason to upgrade the thickness of the roof sheathing as explained above.

That is the job of the contractor and inspector. The 24 16 rating of 7 16 osb will pass code for any standard construction walls roof. Common practice for a composition roof in n texas is with a roof deck of 7 16 osb and rafters at 24 o c. Thicknesses range from 5 16 to 3 4 inch and the proper.

For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. The sign should have said it was great for sheathing over an existing roof. You get what you pay for. You don t need to worry about that.

I only use 1 2 osb on roof sheathing but the apa rating of the osb does allow for 24 centers now the fact that you are on 16 centers 7 16 would be fine although i probably would still use 1 2 out of habit. 2x greater shear strength than similar sized plywood source. Panel thickness will also affect permeability using the 2 perm variable of 7 16ths osb sheathing at 3 4 thickness the permeability drops to 2 3rds of a perm. Osb roof decking thickness 7 16 1 2 or 5 8.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7 16 osb decking. Plywood s advantage over osb. Most roofs look fine yet some roofs show sag.

The sign below the osb i bought from hd said it was great for roofing. Typical framing details are to use 7 16 osb for roof framing on 24 centers. Currently we space rafters 16 oc and use 7 16 osb with h clips. 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 comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. I m contemplating upgrading to 1 2 or even 5 8 osb though to reduce roof sag hopefully to nil.