1 2 Inch Osb For Roof

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1 2 inch osb for roof.

My solution when i built our garage was trusses on 19 3 center the canadian std and 5 8 osb. This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. Half inch osb is suitable for rafter spacings up to 24 inches whether or not the edges are supported. Rediculous except for certain reasons on floors which has nothing to do with this question or 1 2 inch thick osb osb is made up of various chips of wood from different species of trees in a combination that will meet the wwpa structural specs.

One option is to try some test fasteners in the osb. 7 16 is adequate but you dont want to have to many people or shingles in one spot. Sheets must have a 1 8 inch expansion gap between them and should be secured to the rafters. 30 years on it s working out fine.

Osb roof decking thickness 7 16 1 2 or 5 8 if were using osb we get 9 16 we dont worry about getting both 7 16 and 9 16 for walls then the roof we just get all of the same. Only once in many years of construction did i see someone pay for 5 8 osb on a roof presumably to prevent any slight sagging years down the road. Features span rated sheathing 32 16 roof floor on center spacing exposure 1 rated for limited exposure exterior glue for general construction sized for spacing panel width and length may vary up to 1 8 to aid with. Roof leaks of course but also improper attic ventilation can cause condensation in the roof deck that can cause the osb to weaken.

Isherwood jul 26 16 at 15 19. 1 2 vs 5 8 roof sheathing that amazing i dont know of one builder here in minnesota that uses 5 8 for roof decking most use 7 16 osb and have seen a few who use 3 8 cdx. Here in snow country 1 2 osb is standard with 7 16 being common for walls. 3 4 is unheard of and i d consider it absurdly wasteful.

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