When you compress fiberglass insulation you increase its r value per inch up to a point.
													
																	6 inch batt insulation. 
									
	
		
	
																	Buy roxul rockwool acoustical insulation also called mineral wool 6lbs. 
																	Knauf insulation r 19 ecobatt kraft faced fiberglass insulation batt 6 1 4 in. 
																	If you compress a 6 inch r 19 batt into a 3 1 2 inch cavity you get about r 14 or 4 0 per inch. 
																	Roxul s rockwool is very similar to owens corning 705 but is much cheaper. 
															
													
									
	
		
	
																	However there may be times when insulation is compressed to fit specific needs. 
																	Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 
																	Sound attenuation batt insulation ul u465 1 hr single layer wall system 51 ral tl89 288 single layer 5 8 type x gypsum. 
																	If you compress a 6 inch r 19 batt into a 3 1 2 inch cavity you get about r 14 or 4 0 per inch. 
															
													
									
	
		
	
																	As a benchmark one inch of solid wood has an r value of 1. 
																	47 w05182 single layer. 
																	3 8 ss 3 thick sound attenuation batt insulation ul u465 1 hr. 
																	Bi506 10 20 fiber glass insulation manufacturers design batts to fit standard wood and metal framing sizes. 
															
													
									
	
		
	
																	Even in a 5 1 2 inch wall the r 19 which is rated at 6 inches of thickness gives you only r 18. 
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																	Use mineral wool to build broadband acoustic panels and bass traps. 
																	Foamular codebord extruded polystyrene rigid insulation 24 inch x 96 inch x 1 5 inch ship lap edge foamular extruded polystyrene rigid insulation is made in canada and offers a combination of characteristics that result in long term thermal performance of r 5 per inch compressive strengths of 20 100 psi and exceptional moisture resistance. 
															
													
									
	
		
	
																	However when you compress a batt of a particular thickness the total r value does decrease. 
																	In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. 
																	This is a much higher r value per inch but the total value of r 14 is still substantially less than the r 19 you started with. 
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