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Licensed, Insured, and Trusted Across Southern California
Fireplace firebox with refractory brick lining

Fireplace Firebox Repair and Rebuilding

Cracked firebricks and deteriorated mortar compromise fireplace safety. We repair and rebuild fireboxes to code.

BBB Accredited
National Chimney Sweep GuildGoogle Guaranteed
California CSLB Licensed

The firebox is the combustion chamber where flames burn directly against refractory materials. Cracked firebricks, gaps in mortar joints, and spalled panels allow heat to transfer to combustible framing behind the fireplace. Eco Grizzly repairs individual firebricks, replaces factory refractory panels, and performs full firebox rebuilds using high-temperature firebrick and refractory mortar rated to 2,500 degrees Fahrenheit.

Firebox Repair

Project Photos

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When to Repair vs. Rebuild

Single cracked bricks or small mortar gaps can be patched with refractory caulk or replaced individually. If multiple bricks are cracked, the back wall is bowed, or the firebox shows signs of heat damage to surrounding framing, a full rebuild is the safe choice.

Masonry vs. Factory-Built Fireboxes

Masonry fireboxes are built with firebrick and refractory mortar on site. They can be repaired brick by brick or rebuilt entirely. Factory-built (prefabricated) fireboxes use steel or cast refractory panels that bolt or snap into place. When panels crack, they must be replaced with manufacturer-specified parts. We service both types and use the manufacturer-specified panel your unit calls for when a replacement is needed.

Our Repair Process

We remove all loose and damaged material from the firebox, clean the substrate, and install new firebricks or panels with high-temperature refractory mortar. For full rebuilds, we lay a new firebrick floor, rear wall, and side walls on a bed of refractory mortar, maintaining proper clearances to combustible materials. After the mortar cures for 24 hours, we perform a controlled test fire to verify draft, smoke path, and structural integrity.

How It Works

Four simple steps from first call to finished job.

1

Call or Book Online

Reach us at (424) 258-9882 or submit the online form. We respond within two hours on business days.

2

On-Site Assessment

A certified technician performs a thorough chimney and fireplace assessment at your home.

3

Detailed Report

Receive a written report with photos, condition ratings, and an itemized repair estimate within 24 hours.

4

Expert Service

Choose the repairs or maintenance you need. Our crew completes the work on schedule with a clean jobsite.

Why Choose Eco Grizzly

Licensed, insured professionals delivering quality chimney and fireplace service.

$49 Chimney Inspection

Book online and get a professional Level I chimney inspection for just $49. Written condition report included.

Licensed and Insured

All technicians hold California contractor licenses and carry full general liability and workers compensation insurance.

21-Point Safety Check

Our proprietary 21-point checklist covers every chimney component from crown to cleanout.

Same-Day Scheduling

Call before noon and we can often arrive the same day. Next-day appointments are available for most service areas.

Transparent Pricing

You receive a written, itemized estimate with photos before any work begins. No surprises on the invoice.

Eco-Friendly Practices

We use green cleaning agents, HEPA-filtered vacuums, and recyclable materials to minimize environmental impact.

Real Results

Firebox Repair Projects

See real firebox repair work completed by our licensed technicians.

Cracked and damaged smoke chamber breastplate before repairBefore
Chimney & Fireplace

Smoke Chamber Breastplate Repair

Southern California

The breastplate (the sloped front wall of the smoke chamber above the firebox opening) had developed significant cracks and spalling that allowed carbon and gases to escape into the surrounding masonry. Our crew cleaned out all loose material, rebuilt the damaged area with refractory-grade mortar, and smoke-tested the repair to confirm a complete seal. The homeowner can now operate the fireplace safely without risk of CO migration.

Have a project in mind? We can help.

Firebox Repair FAQs


Common questions answered by our certified technicians.

It depends on the severity. Small hairline cracks in individual bricks are common and usually safe. Large cracks, missing mortar, or bricks that have shifted should be repaired before use.
A standard firebox rebuild takes one to two days depending on size and complexity. The mortar needs 24 hours to cure before the first fire.
Replacing a few cracked bricks or panels is a very different job from rebuilding the firebox. Size, whether it is masonry or a prefab panel system, and how far the damage extends all matter. We inspect the firebox and give you an itemized quote covering only what genuinely needs replacing.

Chimney Repair Service Areas

We provide chimney repair throughout Southern California. Search for your city or browse by county.

Discover + Learn From The Industry Leaders

Find answers and insights from chimney experts through our blog section, featuring industry trends, tips and solutions.

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Repair Your Firebox

Call (424) 258-9882 or fill out the form below for a same-day quote.

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