Repair Where Two Roofs Meet

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.

Repair where two roofs meet.

Cover the repaired area with a patch of roll roofing. Attach the valley in place with 1 1 4 inch roofing nails and a shingle hatchet or hammer. 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. How to install roof flashing where 2 roof valleys meet.

If leaks continue to occur from ice dams consider installing roof edge heating cables. The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in. Cut each side at the upper end of the valley to conform with the corresponding slopes of the roof. My suggestion is to tin the junction of the two roofs and put two rows of water and ice barrier down as added protection.

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. If leaks continue to occur from ice dams consider installing roof edge heating cables. This should cover the most leak prone areas. Place the 2 by 4 inch piece of lumber along the center of the flashing.

Sealing metal roof valleys watertight fix valleys where two rooflines meet are typical problem areas on metal roofs. Apply a generous layer of roof cement over the repaired tear then set the patch over the cement covered area. Step 2 consider your available flashing options. Metal to metal connections are difficult to keep watertight long term.

Make sure that all of the procedures preceding roof flashing are done so that you can flash the roof. Step 3 calculate needed flashing. 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.

Position the flashing between the two roof pitches. Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter. A 2 12 pitch should actually get a rubber covering as shingles will not. The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in.