Roof leaks can cause major damage to your home. The difficult part is finding the leak and figuring out whether to repair or replace the roofing material. Here are some common places where leaks can start. If you suspect a problem, ask a roofing contractor to inspect the roof for damage.

Check Out the Roofing Material

Sometimes a roof leak starts in the main roofing material. Whether the roof is made of shingles, slate, or another material, it can wear out over time or become damaged. With roof shingles, look for cracks at the edges of each section or missing granules. Sometimes nails can come out of the roof sheathing and cause problems.

Beware of Roof Valleys

The roof valley is the line where two planes of roofing material intersect. Depending on your locality, the valley may be joined with metal flashing or rolled roofing. Also, if the shingles have not been trimmed properly, they can allow water to penetrate in these locations.

Roof Flashing is Important

Also check out the roof flashing at those areas where the roof meets an opening or structure, such as a chimney, wall, or window. Those areas are often a source of roof problems, particularly on older homes that have not been well maintained. All areas should contain adequate flashing to prevent water from seeping into the joint. In places where the roofing material meets a wall, the flashing should direct water down the wall and away from the edge of the shingles.

Inspect Roof Plumbing Vents

Many homes contain plumbing vents on the roof. These openings can cause problems if there is not adequate flashing. Make sure the seal around the plumbing pipe is intact and that the bottom of the flashing covers the roofing material.

Wind and Ice Can Cause Roof Leaks

Wind damage and ice damming also are a major source of roof leaks. Ice damming causes water to back up and flow into the house. When your home improvement plans involve replacing the roof, ask your roofing contractor about adding ice barriers to help prevent ice damming.

About the Author
Allison E. Beatty is a syndicated real estate writer who has been writing home improvement columns for 15 years.