Fireplace Repair in Woodland Hills: Written Report, Licensed Technicians

A homeowner on a quiet side street off Tujunga Village called us last winter after buying a gas log set online and hiring a handyman to install it inside a 1950s masonry firebox. Within two weeks, the mortar joints behind the gas burner started flaking. Chunks of old refractory panel had crumbled onto the firebox floor, and the homeowner could see hairline cracks running up the back wall of the firebox. She wasn't sure whether this was cosmetic wear or a genuine hazard, but the smell of hot dust every time the gas logs ran made her nervous enough to shut the unit off and call us.

This is one of the most common calls we get from the Ventura Boulevard flats and the Moorpark Street corridor. Older masonry fireboxes in Studio City were built for wood fires. The firebrick and refractory panels in these units handled radiant heat from burning logs, but a gas log burner concentrates heat differently. It pushes sustained, focused flame against the same spot on the back panel for hours. When a firebox already has earthquake micro-cracks or 70 years of thermal cycling behind it, a gas log conversion can accelerate failure fast. Before converting any masonry firebox to gas logs, the firebox itself needs to be evaluated, not just the gas line.

When we inspected that Tujunga Village fireplace, the Level 2 camera scan (required under NFPA 211 anytime the appliance type changes) confirmed what we suspected. The original refractory panels were cracked through in three places, and the throat damper was rusted partially open and could no longer seal. For a gas log conversion on a masonry firebox like this, we replaced all four refractory panels with panels rated for continuous gas flame exposure. We also removed the corroded throat damper and installed a top-mount damper with a silicone seal, which gives a much tighter closure when the fireplace isn't running. That single change cut her heating loss through the flue significantly. A full firebox rebuild would have been necessary if the firebrick behind the panels had deteriorated, but in this case the brick was intact, so panel replacement and the damper swap were enough.

The distinction between refractory panel replacement and a full firebox rebuild matters for your budget and your timeline. Panel replacement on a structurally sound firebox takes one visit. A full rebuild, where we strip the firebox to bare masonry and relay firebrick, takes two to three days and costs roughly double. We see both regularly along the Moorpark Street corridor, where post-war ranch homes share similar construction. Every gas log conversion we handle starts with an inspection and a fireplace cleaning so we can see the true condition of the masonry before recommending either path. If your firebox passes, conversion is straightforward. If it doesn't, you'll know exactly why and what it costs to fix.