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GaryGary · 03-12-10, 09:29 PM

Hi,
As Ryland says, the insulation itself is much more resistant to heat that polystyrene. Polystyrene starts to have trouble around 130F, while polyiso can go above 270F.

I found that around here several lumber yards have it, but did not know it by the name polyiso or polyisocyanurate -- you had to go look at what they actually carried to see.
If its polyiso, it will say polysiocyanurate somewhere on one of the face sheets. You may find that a local place has it, but just does not know it by that name. Atlas and Firestone are two of the common brands.

Gary

03-12-10, 09:29 PM	#4
GaryGary Apprentice EcoRenovator Join Date: Nov 2008 Location: SW Montana Posts: 139 Thanks: 1 Thanked 21 Times in 15 Posts	Hi, As Ryland says, the insulation itself is much more resistant to heat that polystyrene. Polystyrene starts to have trouble around 130F, while polyiso can go above 270F. I found that around here several lumber yards have it, but did not know it by the name polyiso or polyisocyanurate -- you had to go look at what they actually carried to see. If its polyiso, it will say polysiocyanurate somewhere on one of the face sheets. You may find that a local place has it, but just does not know it by that name. Atlas and Firestone are two of the common brands. Gary