Use scrap polyiso for inground gutters?
I have bunch of scrap 1 1/2″ fiberglass-faced roofing polyiso left over from basement insulation project. Next large project I will be working on is fixing grading issues around the perimeter of the house, removing all the bushes right next to foundation, and putting down washed p-stone (likely). I have read before on GBA about those inground insulation “skirts”, but there XPS or EPS is recommended with EPDM on top. Would it be bad to just use scrap polyiso under EPDM?
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