Hi all, I’m building in Maine(zone 6) directly on the coast. The roof is an unvented 3 pitch shed roof. It was my intention to have my builder insulate the top of the roof deck with rigid board before the metal roof went on and additional insulation in the roof assembly to the inside. After a conversation months ago I thought we were on the same page. What has been done is, ice and water directly on the Zip sheathing and metal on top of that. After speaking to him about it, he wants to spray a heavy layer of closed cell on the underside of the sheathing and fill the rest of the rafter with probably fiberglass before a layer of strapping and then blueboard and plaster. I feel like i’ve lost an opportunity to have a great roof insulation job. I’ve done a little reading on this but i’m getting lost in some of the details. One concern i found was, too thick a layer of foam could be problematic, among other things… My hope was to have a continuous insulation layer on the outside so i’m wondering if what he’s suggesting makes sense and would it be wise to add an additional layer of continous rockwool to the bottom of the rafters before strapping? thanks in advance, K-Wig