Forum Title: Polyiso over comp roof?
We install mostly metal roofing?homeowner wants more insulation, he has open ceilings. Is there any problem putting down polyiso sheets(2?)and cover with cdx plywood and underlayment before screwing down the standing seam metal roofing panels? And is there any reason to buy the polyiso bonded with OSB or plywood which is twice as costly as just buying the two parts separately and sandwiching them and screwing them to the old roof? What kind of fastener to go through the 2? and old roof and into a t/g planking?needs to have some broad but flat head.? And not allow the roof to blow off. Thanks for any advice Dick
Category: Roofing Post By: JUDITH R (Detroit, MI), 03/16/2018

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