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Leaks where roof meets siding

 If you’ve ever had a leak occur where your roof meets your siding, it may have caused all sorts of problems. It can cause mold, collapse dry wall, and stain inside your house.

What causes those leaks and what can you do about it?

The cause of the leaks

Houses should have a piece of metal flashing where the roof meets the siding. This is called step flashing, and it lies flat on the roof on one edge, generally under the shingles. The other edge goes behind the siding.

Because the roof expands and contracts over time due to heat and cold, the part that is behind the siding is not nailed down. That way, it can move back and forth.

One way the leaks are caused is when the roof is replaced, but the step flashing is not replaced. As a result, it gets more and more holes in it. If you’ve had three or four roofs on your house in 30 years, the step flashing is going to have a lot of nail holes if it also hasn’t been replaced.

That’s one reason why we usually talk with customers about a roofing system rather than just a roof. There are many components to a roofing system that work well to protect your home.

How to stop the roof leak

The ideal solution is if the step flashing is rusty at all, you have it replaced by a roofer who knows what they are doing.

If your house has had storm damage, be aware that insurance companies don’t like to pay for the step flashing to be replaced at the same time. But a competent roofer will talk to the insurance company and get it paid for.

Really, it’s also a code issue and a manufacturer recommendation. So you want to be sure that your step flashing is in good shape or you could void your warranty and get in trouble. And obviously you don’t want the leaks either.

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