Chimney Repair: A Step-by-Step Guide

The majority of homeowners do not consider their chimney… until the moment they cannot ignore it anymore.

But what most homeowners fail to realize is that it is often the chimney, that hard-working, exposed masonry structure that extends up out of the roofline, that is the cause of much greater problems. And when a chimney begins to leak or fall apart, the damage can spread very quickly.

Now, if you are wondering how to fix a chimney or what goes on there, is it? Well, you are in the right place. When done right, chimney repair can often prevent the need for bigger, more expensive structural work. But knowing what’s involved – and when to call in pros – makes all the difference.

In this guide, we will take you through what is involved in chimney repair step by step, so you can safeguard your home without any worries.

Why Chimneys Need Repair? - And What Causes the Damage?

It helps to first understand why chimneys tend to deteriorate faster than many other parts of a home:

Constant exposure to weather: Your chimney is exposed 24/7/365, with no attic or siding to shield it.
Water infiltration: Water seeps into porous masonry and freezes, causing cracks.
Heat expansion: Fireplaces and furnaces heat the structure, then it cools rapidly, stressing materials.
Structural shifting: Homes settle over time, which can affect chimney alignment.
Aging materials: Mortar and bricks naturally wear down over decades.

Common problems that result:

Crumbling mortar (needs tuckpointing)
Loose or spalling bricks
Cracked crowns (the concrete top of the chimney)
Rusted or missing flashing
Damaged or missing flue liners
Tilted or leaning chimneys

What’s Involved in Chimney Repair? The Full Process

Chimney repair is never “one quick fix.” A thorough professional repair addresses the entire system, not just the obvious cosmetic issues.

Here’s what’s involved when you hire an expert team like Brian LeBlanc Roofing:

Full Chimney Inspection & Assessment

Every quality chimney repair starts with an inspection, because many problems aren’t visible from the ground.

A pro roofer or chimney specialist will check:

Masonry condition (outside and inside)
Mortar joints
Chimney crown
Flashing at the roof line
Flue liner (with video scope if needed)
Signs of water leaks in the attic or living space
Overall structural integrity

This assessment drives the entire repair plan, preventing missed problems and “quick-fix” band-aids that don’t last.

Masonry Repairs: Tuckpointing & Brick Replacement

Tuckpointing is one of the most common chimney repairs.
Old, cracked mortar is carefully removed and replaced with fresh, color-matched mortar, sealing joints and restoring strength.

If bricks themselves are damaged (cracked, spalled, or loose), they are cut out and replaced to match the original style.

Why this matters: Strong masonry keeps water out and prevents further structural damage.

Crown Repair or Rebuild

The chimney crown (top concrete cap) protects the stack from rain, snow, and ice.

Repair may involve:

Why this matters: A sound crown prevents thousands of dollars in future water damage.

Flashing Repair or Replacement

Flashing is the metal barrier where the chimney meets the roof. When it fails, water gets in, not just around the chimney, but into attic insulation, framing, and walls.

A full flashing repair includes:

Removing old rusted or failing flashing
Installing new step flashing and counter-flashing
Integrating with shingles and underlayment
Sealing with flexible, long-life waterproofing
Trim, flashing, and finish work

Why this matters: Proper flashing is the #1 defense against costly leaks.

Flue Liner Repair or Replacement

If your chimney liner is cracked or missing, dangerous combustion gases may not vent safely.

Options include:

Why this matters: Flue liners protect your home from carbon monoxide and fires.

Waterproofing & Final Protection

The final step is to protect the restored chimney against future weather:

Why this matters: Sealing the work extends the life of your investment.

Repair vs. Rebuild - When Is It Time?

Not all chimneys can be “patched.” Sometimes, a full rebuild is the safest option:

An experienced contractor will always recommend rebuilds only when necessary and provide clear guidance on costs, options, and timelines.

Why Professional Chimney Repair Matters?

Could you DIY some chimney repairs? Maybe, but most homeowners underestimate:

“How much structural work is required?”
“The danger of incomplete flu repairs”
“The critical role of flashing and crowns”
“The risks of water intrusion into roof framing”

When you hire Brian LeBlanc Roofing, you get: