3 layer insulation for cathedral ceiling?

Hi GBA,I am turning an attic into a room.   I have 2×5 rafters (old house), 16″ on centre.The roof (which I am about to replace) will be steel on a… Hi GBA,I am turning an attic into a room.   I have 2×5 rafters (old house), 16″ on centre.The roof (which I am about to replace) will be steel on a…Read MoreGreenBuildingAdvisor