[BLDG-SIM] Insulation Values

Renee J. Azerbegi renee at ambient-e.com
Sun Feb 26 07:22:36 PST 2006


Another insulation question while we are on the subject - how have people
taken into account the loss in insulation from roof drain locations when
calculating the average insulation level of a rigid roofs? Is there an
established protocol, paper, or anything to reference on this topic? 
Thank you,
Renée

-----Original Message-----
From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of Kidd, Peter
Sent: Saturday, February 25, 2006 9:14 PM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] Insulation Values

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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