Clear any debris in the roof valley and surrounding area.
Repairing roof leaks in valleys.
And you can tar it but it s a real stop gap band aid like measure.
The best way to find and stop the roof leak is to start over and roof the valley the right way.
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.
Most shingle installers will use a thick 30 lb paper as a base for the valley.
Most roofers that do shingles will use a heavy base paper instead of a rubber membrane.
Valley areas are prone to leak due to the lack of using proper materials.
In order to stop the leak in your roof you need to get to where the leak is occurring.
Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.
Move to the highest end of the valley and work your way down cleaning.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
The right thing to do here is to pull a valley basically pull a valley apart and rebuild it.
This will require that you remove the shingles.
Pull the nails at that side of the ridge shingles to install the.
Make a neat pile of the shingles that you will be able to continue using.
Follow these three preparatory steps to get ready to fix the valley leak.
And roof leaks in valleys often turn into unsightly repairs.
Most roofers that install shingles will not have rubber membranes with them to do such areas.
Where valleys run from the edge of the roof to a ridge trim the flashing to fit under the corresponding side of the ridge shingles.
For example soak the downhill side of a chimney first then each side then the top on both sides.
And if they put a second layer of shingles on they brought it up the valley but they didn t replace the valley it s probably leaking and cracking and split.
A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.
Isolate areas when you run the hose.
Start low soaking the area just above where the leak appears in the house.
A lead valley is a particularly difficult item to dispose of as lead is toxic and so a repair may involve simply patching up your lead roofing.
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.