Repair Where Two Roofs Meet

How to install roof flashing where 2 roof valleys meet.

Repair where two roofs meet.

Place the 2 by 4 inch piece of lumber along the center of the flashing. My suggestion is to tin the junction of the two roofs and put two rows of water and ice barrier down as added protection. Sealing metal roof valleys watertight fix valleys where two rooflines meet are typical problem areas on metal roofs. Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter.

This should cover the most leak prone areas. 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. We cut the rafters to length on the porch roof so that the subfascia would be in line with the subfascia on the new overhangs we d added to the shed roof. The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in.

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. Metal to metal connections are difficult to keep watertight long term. Position the flashing between the two roof pitches.

Cover the repaired area with a patch of roll roofing. This should cover the most leak prone areas. If leaks continue to occur from ice dams consider installing roof edge heating cables. Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter.

Slide the right edge of the flashing under the highest roof pitch. Attach the valley in place with 1 1 4 inch roofing nails and a shingle hatchet or hammer. Make sure that all of the procedures preceding roof flashing are done so that you can flash the roof. 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.

Step 1 make sure all your homework is done. Step 2 consider your available flashing options. If leaks continue to occur from ice dams consider installing roof edge heating cables. 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.