Seal the Top Before Water Finds the Framing

Dennis Hearth & Home LLC fabricates and installs custom stainless steel chimney chase covers for homeowners in Mid-Michigan. Galvanized chimney covers rust through and lift at the seams. You may notice rust stains running down the chase siding, standing water pooling on top of the cover after rain, or gaps where the cover no longer sits flush against the chase walls. These signs indicate that the cover has failed and is allowing moisture into the wood structure below.

A chase cover is the metal lid that caps the top of your chimney chase, fitting over the wood framing and sealing around the flue pipe. Factory covers are typically made from galvanized steel, which corrodes quickly in Mid Michigan's freeze-thaw cycles and leaves the wood sheathing exposed to rain and snowmelt. Once the cover rusts through or its seams separate, water enters the chase cavity rotting the framing from the inside out.

If you see rust, standing water, or gaps on your chase cover, schedule a measurement and fabrication consultation to prevent further damage to the structure below..

When you arrange a chase cover replacement with Dennis Hearth & Home LLC, the team measures the chase dimensions on your roof and fabricates a cover from stainless steel, which resists rust and maintains a watertight seal for decades. The new cover includes a raised flue collar that fits snugly around the pipe, a sloped top that sheds water away from seams, and hemmed edges that overlap the chase walls by at least two inches on all sides.

After installation, you will no longer see rust stains on the siding, and standing water will drain off the sloped surface instead of pooling. The stainless steel finish remains bright and corrosion-free through winter salt air and summer humidity, and the sealed perimeter stops moisture from reaching the wood framing. Most covers are installed in a single visit once fabrication is complete.



Chase cover replacement does not include repairing existing wood rot or replacing damaged siding on the chase itself. If the framing or sheathing has already deteriorated, that work is addressed separately before the new cover is installed. The cover replacement focuses solely on sealing the top opening.

Homeowners often ask how long a stainless cover will last and whether custom fabrication is necessary. These questions address material differences, installation details, and long-term performance.

Why does stainless steel last longer than galvanized?

Galvanized coatings wear away in Mid Michigan winters, exposing bare steel that rusts rapidly. Stainless steel resists corrosion throughout its entire thickness and does not rely on a surface coating.

How is a custom cover different from a stock replacement?

Custom covers are measured to your exact chase dimensions and fabricated with seams in the correct locations, ensuring a tight fit and proper drainage. Stock covers often leave gaps or require modification on site.

What happens if I wait to replace a rusted cover?

Water enters the chase through the corroded areas and rots the wood framing, leading to far more expensive reconstruction work. Replacing the cover early prevents structural damage.

Can I install a new cover over damaged wood?

No, the wood must be solid enough to support fasteners and provide a stable mounting surface. If rot is present, the sheathing is repaired first.

How do you seal the cover to the chase?

The cover edges overlap the chase walls and are fastened with corrosion-resistant screws, then sealed with high-grade caulk that remains flexible through temperature changes common in Mid Michigan.

Dennis Hearth & Home LLC provides custom stainless steel chase covers throughout Mid Michigan, ensuring a precise fit and long-term protection for your prefab fireplace enclosure. Contact the team to arrange a measurement visit and receive a fabrication timeline based on your chase dimensions.