Roof Flashing

Flashing deflects water from vulnerable areas on the roof. This helps prevent leaks and water damage.

There are two types of roof flashing — step flashing and counter flashing. Both are made of metal.

Step flashing is installed where a pitched roof meets a vertical wall. It's laid under the shingles and makes an L shape to eliminate water leaks at the seam. Counter flashing is then attached to a vertical surface, usually a chimney or a wall and should always overlap step flashing.

Flashing problems can cause leaks. But there are a few steps a homeowner can take to insure roof flashing is secure:

Check the roof to make sure the step flashing is interwoven between the shingles and the counter flashing is tightly sealed with mortar or caulk.
Check yearly for gaps, cracks and any missing flashing.
Don't substitute flashing with caulk, sealant or roof cement. These compounds can't do the job nearly as effectively as proper flashing.

Flashing is the last line of defense against roof leaks, which can be a very expensive problem to have. If you suspect you have a flashing problem, call in a professional before it gets any worse.