When you discover roof leaks you should try and find the exact location that the roof leaks are coming from, because although the roof might be leaking from one spot the source of the roof leaks might have originated way on the other side of the roof.
This task can take time and lots of patience. Look for pools of water and check your shakes or shingles, gutters, eaves etc. Ok so you have checked all of the above and you still cannot locate the roof leaks, well it is time that you should check your valleys.
To check your valleys you will have to open them by removing some of the valley shingles to see what type of roofing underlayement or flashing is under the valley shingles. Check the valley for holes along the joint, and if you discover any holes these will have to be repaired with the same type of sheet metal that your valley is made of.
Simply clean the valley surface using a wire brush and cut the sheet metal patch around two inches bigger that the actual hole. Paste on a generous amount of roof cement and press the patch in position on the damaged area.
Apply some more roof cement on the edges of the patch to make a secure waterproof seal. If on the other hand you discover that some of the valley shingles are damaged and need to be replaced, you should not attempt this task until you are sure that you are experiencing fine weather conditions, as this task cannot be done in rainy weather conditions.
Start from the top of the valley down, roll back the shingles and remove both the undrlaying nails and damaged valley shingles.
Remove enough valley shingles so that you have at least three feet of space to work with. Before you begin installing your new valley shingles make sure that you have adequate flashing installation in the valley.
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