Quantifying global warming potential of various rigid foams?
It’s easy enough to find the GWP of blowing agents used for various rigid foams. For example, from the info I’ve found on GBA and elsewhere:
EPS (all types) uses pentane, GWP=7
Typical XPS uses HFC/HCFC blends, GWP=1430
Soprema Sopra XPS-30 uses undisclosed formula, GWP=1
What I haven’t found is how much blowing agent is used to produce, say, a pound of each type of foam. It seems like that’s an important number.
Does it take twice as much pentane to produce Type I EPS (1lb./CF) vs. Type IX (2lb/CF)? Or half as much? Or is there any difference?
How does the amount of HFC/HCFC required to blow typical XPS compare with the amount of pentane required to blow EPS?
How does the amount of Sopra’s blowing agent per pound compare with the amount of agent per pound used for typical XPS and EPS?
It seems if Sopra uses 7X the amount of blowing agent per pound as Type IX EPS, the actual carbon footprint of using either below grade would be about the same. (Assuming one can simply multiply the GWP of the agent by the quantity of agent used.)
Can anyone point me in the right direction?
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