Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.
Osb roof sheathing thickness.
1 inch 25 4 mm.
Cdx works fine in 1 2 or 5 8 thickness.
Some roofers or manufacturers don t like to install over skip sheathing but i ve never had a problem with it locally.
Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8.
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.
Allowable spans for lumber floor and roof sheathing a b for si.
With edge support and the same snow load 3 8 inch osb can be used.
For pricing and availability.
Osb roof decking thickness 7 16 1 2 or 5 8 currently we space rafters 16 oc and use 7 16 osb with h clips.
Thicknesses range from 5 16 to 3 4 inch and the proper one to use.
For pricing and availability.
Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.
Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8.
With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.
I ve never used commodity osb on a roof but it s probably fine in 5 8 thickness and possibly in 1 2 thickness.
Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.
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.