Fireplace Refractory Panels

A factory-built fireplace is a metal box designed and tested as a complete system, and the refractory panels are part of that system. They absorb and slow the transfer of heat so the steel behind them doesn’t overheat, warp, or burn through, and so nearby wood framing stays at safe temperatures. Many panels are also shaped to reflect heat back into the room.

Masonry fireplaces work differently. Instead of panels, they are lined with firebrick set in refractory mortar. If you have a site-built brick fireplace, see our firebox joints page for the masonry version of this repair.

• Cracks that are wide, deep, or getting longer
• Chipped, missing, or crumbling pieces of panel
• Panels that have shifted, bowed, or come loose from their clips
• Gaps where you can see the metal behind the panel
• Rust on the metal around or behind the panels
• Panels that feel soft or powdery to the touch

Fine surface cracks are common and are not always a problem. Many manufacturers give guidance on what kind of cracking is acceptable and when a panel must be replaced, so we compare what we see with the instructions for your specific fireplace. Larger cracks, missing pieces, or exposed metal mean the fireplace should not be used until the panels are replaced.

1. Identify your fireplace. Factory-built fireplaces have a rating plate or label, usually just inside the opening or behind the screen, showing the manufacturer and model. Replacement panels need to be the ones made for that model.

2. Inspect. We look at the panels, the firebox, the damper, and the chimney pipe and cap. Panel damage is sometimes a sign of something else, such as very hot fires or water coming in from the top of the chimney.

3. Get the right parts. We source panels listed for your fireplace. Generic panels, homemade panels, or firebrick cut to fit can change how the fireplace handles heat and are not a safe substitute.

4. Replace and secure. The old panels are removed, the firebox is cleaned, and the new panels are installed and secured the way the manufacturer specifies.

5. Final check. We confirm the panels are seated properly and go over a few habits that help them last.

When a panel cracks through or breaks away, heat reaches the metal firebox directly. Over time that can warp or burn through the steel, and heat can travel toward wood framing inside the chase or wall. Because a factory-built fireplace is tested as a system, keeping the correct panels in good condition is part of using it safely.

To help panels last, build moderate fires rather than very large ones, set logs down gently instead of tossing them in, use a grate so wood doesn’t rest against the panels, and keep water out of the system with a good chimney cap, storm collar, and rain pan.