Siding Completion Artis Exterior November 1, 2016November 14, 2016 0 Comment The siding is completed. The dormer is insulated inside with polystyrene and foamed. Most of the walls are insulated with fiberglass R-15. We will add 1.5″ of polystyrene R-7 after the electrical is installed and inspected. Dormer insulation Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Like this:Like Loading... Related