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This is where roofing material runs up to and along a
vertical wall. As each row of shingle is installed a metal flashing (Step
Flashing) is installed over the shingle and up and under the wood, stucco or
vinyl siding material or under the counterflashing imbedded in brick. The
first thing to check is to see if there is metal flashing installed with the
roofing material and does it look in good condition. If you find that this area
has it been tarred or caulked, you can consider that you found the likely
area for a leak to originate from. Before your begin this repair, check to make
sure the siding is in good shape as this can also lead to leaks along these
areas. Usually, installing the correct flashings is time consuming, requires an
experienced roofer and can be expensive. But sidewall flashings are an
important part of the roofing system.

Generally, roof leaks are the result of poor roofing installation
techniques, an older roof ready for replacement, a product mounted or attached
to the roof system incorrectly (a satellite dish for example) or poor roof top maintenance
such as the build up of debris or moss on the roof. But sometimes even the best
leak detectives can be fooled. Attic condensation caused by high humidity can
cause leak like symptoms. Make sure dryer, bath and stove vents are connected
directly to dedicated vents that expel the moisture outside the attic crawl
space.

When inspecting your roof – remember, be cautious and safe.
Hire a professional when in doubt.