Insulation or other building material 9.
													
																	Wood insulation r value. 
									
	
		
	
																	For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. 
																	Aging effects comments. 
																	The closer a climate gets to an extreme in heat or cold the more necessary it becomes to use insulation with a higher r value. 
																	Wood r values log wall r values vary 16. 
															
													
									
	
		
	
																	In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. 
																	A material s thermal resistance or resistance to heat flow is measured by its r value. 
																	These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 
																	The table below shows what levels of insulation are cost effective for different climates and. 
															
													
									
	
		
	
																	The r value for wood ranges between 1 41 per inch 2 54 cm for most softwoods and 0 71 for most hardwoods. 
																	R value is a measure of insulation s ability to resist heat traveling through it. 
																	1 01 1 41 softwoods 0 71 hardwoods the r value of wood varies by wood density species moisture content. 
																	Recommended home insulation r values. 
															
													
									
	
		
	
																	Insulation level are specified by r value. 
																	For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. 
																	In a solid log wall the logs provide both structure and insulation.