How To Tie In Valleys On Shingle Roofs Together

How to shingle a valley with architectural shingles.

How to tie in valleys on shingle roofs together.

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. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition.

The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley. 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. After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in. With a clean valley you can lay down some peel and stick roofing membrane.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. To secure the roof valley flashing nail it down carefully. Only nail at the edges with only enough nails to hold it in place. Up from the valley center and cut through the shingles and underlayment.

Use a speed square to find the proper angles and cut. When two roof planes meet at an inside corner a valley is created. 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. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

Ensure ice and water protector has been installed along the valley first. 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.