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Do rigid polyurethane panels exist in the US?

bluesolar | Posted in Energy Efficiency and Durability on

Hi all — The Wikipedia list of insulation materials includes “polyurethane rigid panels” as one of the highest scoring materials. It reports R-6.8 per inch as the initial value for pentane-expanded polyurethane, and R-5.5 when aged 5-10 years (which is still about 38% higher than EPS).


Problem: I can’t find polyurethane panels at Home Depot, Lowe’s, or Menards. All I find are EPS, XPS, and polyiso.

Do polyurethane panels exist in the US market? If so, where are they sold?



  1. Expert Member
    BILL WICHERS | | #1

    Those R value numbers are about right for polyiso. Polyiso is polyisocyanurate. Regular two-part spray foam is a type of polyurethane foam, which also has similar R values to polyiso. You might as well just go with polyiso since it’s readily available and offers essentially the same R value as the Wikipedia article gives to polyurethane foam.

    Wikipedia even mentions that polyiso starts out similarly to polyurethane as a chemical compound, but has some different reactants to arrive at the different final product.


  2. Expert Member
    NICK KEENAN | | #2

    There's a guy near me selling factory seconds on Craigslist that he advertises as "basically spray foam in sheets." I don't know if that means polyiso or really polyurethane.

    1. Expert Member
      BILL WICHERS | | #3

      Those sheets look like polyiso to me. Usually one side will have some printing to tell you what it is, but I didn’t see that in his pic.

      You could probably haggle his prices down a bit too. I usually see factory second 1/2” polyiso for around $5/sheet, for example.


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