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Roof membrane
A pure guess - but I am guessing it is 40 mil. In commercial construction 40 mil EPDM or TPO is considered a budget roof...60 mil is the more expensive and durable roof.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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