Grace Ice and water shield HT on roof sheathing below rigid insulation
Hello GBA community. I will soon be building our home in NC, on the boarder of climate Zone 3 & 4. I have been doing alot of home work on this and other sites about the different building techniques for green and energy efficiency. Today however i have a question about the G i&WS. i will be building out the roo like such. plywood sheathing, I&WS, 4 inch rigid foam insulation, plywood, standing seam metal roofing. my question is weather or not to use i&ws on the structural roof decking or something such as vycor env-s. if i were to use the vycor env-s on the sturctural seathing should i use i&ws on the top seathing below the metal roofing? thank you for your opinions.
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