Install a shingle underlay. Insert the edge underneath the layer of shingles closest to the house’s edge. The underlay should easily slide underneath the shingles and extend approximately 3 inches over the house’s edge.
Secure the underlay to the house with a continuous bead of roofing cement along the underlay’s top. Press down on the shingles. Secure the underlay’s ends by nailing roofing nails into the overlay underneath the shingles.
Install the 2-inch fascia wrap underneath the shingle underlay. Position the vented wrap in the place of a gutter or eave. Secure the ends of the wrap under the entire length of shingle underlay using roofing nails and a hammer.
Ensure that the shingle underlay extends approximately one-half inch over the fascia wrap.