Bob flashed back to the installation of the new roof. First the crew removed the old layers of roofing material from the barn. Next they added a layer of Louisiana Pacific oriented strand board (OSB) over the original sheathing. It's manufactured with thin wafers of wood, resins and wax compressed under intense heat. When used as roof sheathing it's extremely resistant to moisture damage. Then they stapled down a layer of felt paper and marked with chalk lines to lay out the courses of asphalt shingles. Since these are double layer shingles, they're fastened along the pre-marked white line to assure that both layers are attached to the roof. Frames for the Velux VSE skylights were installed. These vented skylights will be operated with a hand-held remote. Copper step flashing is added to the side of the skylights and the asphalt roof shingles are fastened up to it.

House eleven of the Elmwood project. A new kind of rubber slate is applied to the entire roof.

Ken Langevin from Owens Corning tells Bob about the architectural shingles that have been selected to replace the old roofing material. The shingles are called architectural because they have a three-dimensional look, and they have a 40-year warranty because of the extra build-up of asphalt and mineral granules. Contractors find the shingles are easy to install. The ridge vent comes in a roll. It's rolled out on the ridge and attached with a nail gun. It has a wind driven baffle so any rain that does get in will just sit, and it's covered with the hip and ridge shingle to give it that architectural, three-dimensional look. They also installed an ice and water barrier on the ridge and eaves so that any ice build-up in the gutters won't be able to push up underneath the new shingles.