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.