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Our new build is done with insulation on the top of the deck, peel and stick membrane then Polyiso insulation then a top layer and screwed to the deck and two ply torch on membrane over that, can use metal if you have enough slope need about 1 1/2" over a foot.
Any commercial roof co will inform you of the details, not cheap though, up here about $20 sq ft if I remember right.
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87 930,
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