Then install a non corrosive metal valley flashing of 24 minimum width.
Repair roof valley flashing.
Open valleys have metal flashing to protect this critical area of the roof.
Then reshingle sliding metal step flashing behind the fascia board the trim behind the gutter.
Plug pinholes with roofing cement and patch holes up to about 3 4 inch in diameter with a patch from the same material as the flashing.
A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.
Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
This should cover the most leak prone areas.
The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in.
Once the roof valley has begun to leak you will need to cover the valley with flashing in order to prevent a repeat of the problem.
Repairing a roof valley involves removing some shingles and installing a.
If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof.
A crack in the valley can cause major damage and i.
In other cases shingles are overlapped to make a valley and water from harsh rains can find a way under the shingles.
At the top edge of your roof valley check to make sure the flashing is properly angled to line up with the slope of the roof.
First roughen the area around the hole with a wire brush or sandpaper and then clean it.
Install an underlayment centered in the roof valley.
In order to lay the flashing the shingles on the roof will have to be removed.
While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately.
Replace all shingles you removed making sure their edges are at least 1 inch from the elevated center of the flashing.
If leaks continue to occur from ice dams consider installing roof edge heating cables.
Use roofing nails to secure the flashing in place driving nails at 1 foot intervals along the outer edges of each side from top to bottom.
Toronto s roof repair specialists http www mrroofrepair ca show the cause of a major interior roof leak.
Small holes or corroded spots in flashing can be easily repaired.
