How To Tie In Valleys On Shingle Roofs Together

Measure between that truss or rafter and the valley rafters with a tape measure and cut short rafters to tie the old and new rafters together.

How to tie in valleys on shingle roofs together.

With a clean valley you can lay down some peel and stick roofing membrane. Up from the valley center and cut through the shingles and underlayment. After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

How to shingle a valley with architectural shingles. Use a speed square to find the proper angles and cut. The roofing cement will resist possible leaks overnight. Then starting at the base of the valley center your first piece of flashing in the valley.

When two roof planes meet at an inside corner a valley is created. 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. Only nail at the edges with only enough nails to hold it in place. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition.

Because valleys collect and channel a greater volume of water than a single roof plane i always make an extra effort to design and build them as watertight as possible. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. Ensure ice and water protector has been installed along the valley first. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. To secure the roof valley flashing nail it down carefully.