Repair Where Two Roofs Meet

Position the flashing between the two roof pitches.

Repair where two roofs meet.

Step 2 consider your available flashing options. Cover the repaired area with a patch of roll roofing. Sealing metal roof valleys watertight fix valleys where two rooflines meet are typical problem areas on metal roofs. Step 3 calculate needed flashing.

Attach the valley in place with 1 1 4 inch roofing nails and a shingle hatchet or hammer. Place the 2 by 4 inch piece of lumber along the center of the flashing. We mitered the two subfascias where they met and then filled in with wedged shaped blocking screwed to the tops of the common rafters to support the plane of the shed roof. The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in.

A 2 12 pitch should actually get a rubber covering as shingles will not. This should cover the most leak prone areas. Metal to metal connections are difficult to keep watertight long term. Using 3 layers of thermal tec s mr multi ply roof system where most of the movement occurs will provide a watertight seal in these areas.

The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in. Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter. If you didn t need to replace the roof substrate cut a patch of tar paper or rubber roll roofing 12 in 30 cm wider and longer than the mended section. Apply a generous layer of roof cement over the repaired tear then set the patch over the cement covered area.

Slide the right edge of the flashing under the highest roof pitch. Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter. How to install roof flashing where 2 roof valleys meet. This should cover the most leak prone areas.

Make sure that all of the procedures preceding roof flashing are done so that you can flash the roof. Step 1 make sure all your homework is done. My suggestion is to tin the junction of the two roofs and put two rows of water and ice barrier down as added protection. Cut each side at the upper end of the valley to conform with the corresponding slopes of the roof.