A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.
Patching a roof valley.
Clear any debris in the roof valley and surrounding area.
Move to the highest end of the valley and work your way down cleaning.
Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.
Follow these three preparatory steps to get ready to fix the valley leak.
If you find that this is a problem then you will need to repair your roof valley before anything serious happens such as plaster loss or even major water damage.
Measure the width of the sheet metal valley flashing.
Start at the upper row of shingles at the upper end of the.
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.