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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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Several years ago I had one of the biggest chimney sweep companies in town come out to clean my chimney and it was a DISASTER! By the time they finished, my carpets and furniture were covered in dirty, grimy soot, and it was a nightmare to have cleaned!

Because of my past experience with that other company, I was understandably cautious about having another chimney sweep into my home, but I decided to give A to Z since they came highly referred. Needless to say, I was not disappointed! A to Z was on time and very careful to cover my white carpets with fresh, clean tarps not only in front of my fireplace, but everywhere they walked, too!

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