How To Tie In Valleys On Shingle Roofs Together

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing.

How to tie in valleys on shingle roofs together.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Up from the valley center and cut through the shingles and underlayment. The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley. Only nail at the edges with only enough nails to hold it in place.

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. 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. Use a speed square to find the proper angles and cut. First clean the debris out of the valley including sawdust nails and whatever else is in there.

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. After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in. The roofing cement will resist possible leaks overnight.

To secure the roof valley flashing nail it down carefully. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. How to shingle a valley with architectural shingles. 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.

With a clean valley you can lay down some peel and stick roofing membrane. 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.