Proper Way To Shingle A Roof Valley

When shingling a roof with three tab shingles it s easiest to shingle the roof planes first working toward the valley.

Proper way to shingle a roof valley.

In addition it is important to avoid nailing the shingles through the valley metal. Imbed each step flashing in a 75 mm 3 wide application of asphaltic plastic cement and nail in place. To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof. However these shingles are not run entirely through the valley area but rather the center of the metal valley is left exposed.

Only nail at the edges with only enough nails to. As the asphalt shingles are installed over the roof deck the shingles are extended into the valley. Ensure ice and water protector has been installed along the valley first. To secure the roof valley flashing nail it down carefully.

Remove existing roof and underlayment. There are two simple rules to follow. From the stepped off main part of the roof run shingles into the valley and cut them square from where the bottom corner intersects with the shingles nailed along the valley line. Use 4 nails per shingle and 6 nails on the prevailing windward sides of the roof as wind resistance nailing.

The original plan was to preserve a portion of the existing roof since. Place the nails along the edge of the valley metal not into it. Butt a full shingle up against the cut shingle and nail into place. Each flashing should overlap the one below by at least 75 mm 3 but not be visible below the shingle top lap.

All valleys start the same. Repeat this basic pattern alternating shingles across the roof working toward the right side using the chalk line to keep the shingles straight horizontally. One nail goes into the top section of the shingle where it covers the valley metal. I then move the shingle to the uppermost course on the roof plane line up the mark on the shingle with the valley center and again mark the corner.

This picture gives you an idea of the condition of the existing roof plywood and you.