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Home » Customer Service » Chimney Repairs & Installations » Pre-Fabricated Chimney Repairs » Water Damaged Firebox (Rusting)

Water Leaks on Prefabricated Chimneys

Unlike Masonry Chimneys, Prefabricated chimney components are made of thin sheet metal and are very susceptible to rusting. Left unchecked, water damage often causes your fireplace or stove to become damaged beyond repair requiring a total replacement of the entire system! For this reason, it is imperative that water is not allowed to collect or infiltrate where it doesn’t belong!

The following are the most common types of water leakage problems we see on prefabricated, factory-built chimney systems. If your chimney system has any of these problems, you’ll want to have it corrected as soon as possible to avoid unsafe conditions or avoidable expensive repairs in the future.

Chimney Cap Issues

Damaged chimney rain cap.Damaged chimney rain cap.

Missing chimney rain cap.Missing chimney rain cap.

Chase Pan Cover Issues

Ponding water on chase pan cover.Ponding water on chase pan cover.

Chase pan cover rusted through.Chase pan cover rusted through.

Chase pan cover penetrated with nails or screws.Chase pan cover penetrated with nails or screws.

Chase pan cover rusted and incorrectly pieced together.Chase pan cover rusted and incorrectly pieced together.

Wood rot due to an incorrectly sized chase pan cover.Wood rot due to an incorrectly sized chase pan cover.

Storm Collar Issues

Storm collar missing.Storm collar missing.

Storm collar not caulked.Storm collar not caulked.

This storm collar has been installed too high.This storm collar has been installed too high.

Signs of Water Leaks

A peek between the upper fireplace ventilation louvers will often reveal water marks if a leak above is present.A peek between the upper fireplace ventilation louvers will often reveal water marks if a leak above is present.

Visible water stains inside the firebox are also strong indicators that the sheet metal firebox is on its way to becoming rusted out. Visible water stains inside the firebox are also strong indicators that the sheet metal firebox is on its way to becoming rusted out.

When this happens, the entire fireplace and chimney pipe will need to be replaced.When this happens, the entire fireplace and chimney pipe will need to be replaced.

Extensive rust damage.Extensive rust damage.

You can convert your prefab unit with a wood stove insert. Consult with A to Z to get all the details about this type of upgrade to be sure it’s done right!


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Your employee was on time and very careful about cleanliness! I appreciated the fact that he took the time to not only put tarps down in front of my fireplace, but also everywhere he walked as he came in and out of my home… I have had my chimney cleaned by several companies over the years, and I don’t think I remember anybody being as careful to keep it clean as A to Z!

Also, another difference I noticed was the fact that your guy was here about ½ hour longer than any other chimney guys I’ve had in the past. Not only did it seem he was more meticulous and concerned about doing a thorough job, but he also put a Chim Scan Camera up into my chimney after cleaning to make sure there were no dangerous cracks or gaps.

You guys weren’t the cheapest in town, but I feel I DEFINTELY got a better value with your company than any others I’ve used in the past. You took more time, did a better job, and thoroughly answered all of my questions in terms that I could understand.

Great job from start to finish! Now that I’ve found you, I’ll use A to Z exclusively from now on!
~ Greg and Marsha Johannson, Granite Bay, CA
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