Chase Covers: Common Source of Leaks

What Is a Chimney Chase Cover, And Why It’s One of the Most Common Leak Problems

Not All Chimneys Are Brick, And That Matters

When most people think of a chimney, they picture a brick-and-mortar structure. But a large number of homes, especially in areas like Chester, Chesterfield, Richmond, and surrounding communities, actually have what’s called a chimney chase.

A chimney chase is essentially a framed structure built just like the rest of your house:

• Wood framing

• Plywood sheathing

• Covered with siding, vinyl, or sometimes stone veneer

Inside that chase is usually a factory-built fireplace or direct vent appliance, with a metal flue pipe running up and out the top.

And right at the very top of that structure is one of the most important, and most overlooked—components:

👉 The chase cover

What Is a Chase Cover?

A chase cover is a metal pan that sits on top of the chimney chase, sealing it off from rain, debris, and animals.

It has:

• A hole for the flue pipe to pass through

• A raised collar around that hole

• Edges that sit over the top of the chase

Think of it like a lid on a box, it’s the only thing keeping water out of that entire structure.

Why Chase Covers Are the #1 Source of Chimney Leaks

Here’s the problem: most chase covers are built with cheap materials from the start.

Typically, builders install:

• Galvanized steel

• Thin painted metal

Over time, these materials fail, and they fail in predictable ways:

1. Rusting Through

Once the coating wears off, the metal begins to rust.

Eventually, it creates holes in the top, allowing water to pour directly into the chase.

2. Sagging and Water Pooling

Many chase covers are flat or poorly braced.

They begin to sink in the middle, which causes water to sit instead of draining off.

That standing water:

• Speeds up rusting

• Eventually eats through the metal

3. Water Running Underneath the Cover

Without a proper edge design, water can:

• Run off the top

• Curl back underneath

• Get trapped against siding and wood

This leads to:

• Rotting wood framing

• Interior leaks

• Mold and hidden structural damage

Signs Your Chase Cover Is Failing

If you’re noticing any of the following, your chase cover could be the culprit:

• Water stains on ceilings or walls near the fireplace

• Musty odors coming from the fireplace

• Visible rust on top of the chase

• A sagging or “dished-in” top

• Loose or deteriorated sealant around the pipe

• Hearing water dripping inside your fireplace (this is very common with factory-built fireplaces, where water drips down onto the metal firebox and can actually be heard)

By the time you see—or hear—these signs, the problem has usually been there for a while.

The Right Way to Fix It (And Not Have to Worry Again)

When a chase cover fails, patching it is usually temporary at best.

The real solution is replacement and doing it right

.

At Dan’s Chimney Service, we replace chase covers with custom stainless steel systems designed to last.

Here’s what makes them different:

Stainless Steel Construction

• Will not rust like galvanized or painted metal

• Built to last decades (often a lifetime)

• Eliminates repeat failures

Built-In Drip Edge

• Directs water away from the chase

• Prevents water from running underneath

• Protects siding and framing from rot

X-Brake (Raised Center Design)

• The center of the cover is slightly elevated

• Forces water to run off instead of pooling

• Prevents sagging over time

Raised Collar Around the Flue Pipe

• Keeps water from entering around the pipe

• Works together with a properly sealed storm collar

• Adds another layer of leak protection

A One-and-Done Upgrade

A properly built stainless steel chase cover isn’t just a repair—it’s an upgrade.

It:

• Solves one of the most common leak points permanently

• Protects the entire chimney structure below it

• Improves the overall look of your home

• Saves money by preventing ongoing damage

Once it’s done right, it’s not something you should have to worry about again.

Serving Chester, Chesterfield, and the Richmond Area

If you’ve got a chimney chase and you’re dealing with leaks—or just want to prevent them—it’s worth taking a look at the condition of your chase cover before it becomes a bigger problem.

Need Help With a Leaking Chimney?

If you suspect your chase cover may be failing, having it inspected early can save you from much more expensive repairs down the road.

Dan’s Chimney Service specializes in diagnosing and correcting chimney leaks, including full chase cover replacement with long-lasting stainless steel systems.