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.

Ryley and Dominic demonstrate installation of architectural grade dimensional asphalt shingles on the Habitat for Humanity Blitz Build house in Yonkers, New York.

Bob and roofer Paul Morris start by cutting a rough opening in the roof and laying a weather shield. The skylight is mounted into place and the flashing is applied. Bob then assists in laying the new asphalt-shingles.