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.
1 2 inch osb for roof.
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.
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.
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.
3 4 is unheard of and i d consider it absurdly wasteful.
My solution when i built our garage was trusses on 19 3 center the canadian std and 5 8 osb.
Around here southern mn the cities you can drive through the neighborhoods with cheaper houses the ones with trusses on 24 centers and 1 2 or 7 16 sheeting and most many will have sagged roofs.
If you get 45 or more pounds of pull out resistance that s considered acceptable for most applications.
Here in snow country 1 2 osb is standard with 7 16 being common for walls.
7 16 is adequate but you dont want to have to many people or shingles in one spot.
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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.
Half inch osb is suitable for rafter spacings up to 24 inches whether or not the edges are supported.
This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness.
3 8 is insane walking truss to truss.
One option is to try some test fasteners in the osb.
1 2 cat ps2 10 osb sheathing application as 4 x 8 item 12213 model 660663 compare find my store for pricing and availability 5 zip system 1 2 cat ps2 10 tongue and groove osb sheathing application as 4 x 8 item.