After finishing sheeting the roof it is time to insulate and waterproof it. For the insulation we used 1 inch extruded foam with an insulation value of r-5. For the waterproofing we used Sharkskin roofing underlayment. Underneath all that we first put on commercial grade tyvek just to add another layer of protection. The waterproofing is a normal thing for all roofs and exteriors of every house obviously but the insulation on the outside isn’t. The purpose of the insolation is to help prevent thermal bridging through the much less insulative wood studs, headers, and rafters. This insulation is just in addition to the other insulation that will eventually be sprayed on from the inside.
The front door of the future office of Footprint Construction.
