[BLDG-SIM] Insulation Values

Kidd, Peter jpkidd at hydro.mb.ca
Sat Feb 25 20:13:41 PST 2006


google on LTTR (long term thermal resistance); products which use air as a blowing agent do not change in r-value due to outgassing; some argue that hermetically sealed insulations (encased in metal in one example) cannot outgas and retain their initial high R-value, but a perfect seal or delayed loss ?

From:  

	To: BLDG-SIM at gard.com 
	Sent: Friday, February 24, 2006 4:41 PM
	Subject: [BLDG-SIM] Insulation Values


	Does thermal conductivity of polyisocyanurate roof insulation change over time? 
	Will the R-value decrease over time? There seems to be conflicting information about this. 

	Mark Zoeteman 


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