Muckin_Slusher
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Yeah, I read all about that. I was gonna use polystyrene, but it's more difficult to find in town. They only had the crumbly pressed white balls stuff or the pink/blue expensive stuff.Poly iso is good. Looses r value faster in cold, but starts higher than other foam also.
6 sheets of 4x8x2" of this stuff cost me nearly $600 CDN.