The higher the r value the greater the insulation performance.
													
																	Roof panel r value. 
									
	
		
	
																	To convert rsi to r value multiply the rsi by 5 67826. 
																	R value table for roofing materials and building insulation. 
																	The r value of each osb facing is r 0 55. 
																	To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 
															
													
									
	
		
	
																	R value measures how well certain building insulation materials can resist heat. 
																	R value is used in the united states. 
																	R value is used as a measurement of the effectiveness of thermal insulating materials. 
																	The higher the r value the better a material performs as a thermal insulator. 
															
													
									
	
		
	
																	Types of roof insulation. 
																	When determining how much insulation you need don t guesstimate calculate. 
																	Calculated r values for generic structural insulated panel sip including 7 16 oriented strand board osb on each side. 
																	For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. 
															
													
									
	
		
	
																	Expanded polystyrene eps is type i per astm c578 11.