Chimney Checks After an Earthquake

The Valley Has Seen This Before

On January 17, 1994, the Northridge earthquake shook the San Fernando Valley hard enough to topple chimneys across the region. Woodland Hills, Canoga Park, Encino and Tarzana were all close to the center of it. Many chimneys that came down were rebuilt. Many more that cracked but stayed up were patched, and those patches are now three decades old. Smaller earthquakes since have kept working on the same weak points.

If you feel a quake strong enough to knock things off shelves, the chimney deserves a look before the next fire. This guide explains why, what an inspection after an earthquake involves, and what to do with the result.

Why Chimneys Take the Damage

A masonry chimney is tall, heavy and stiff, and it is attached to a house that flexes. During shaking, the house and the chimney move differently. Stress collects where the chimney passes through the roof and where it meets the firebox. Older chimneys built without steel reinforcement, which describes many built before the 1970s, have nothing holding the brick together but mortar.

The damage that matters most is often invisible from the room. Clay flue tiles crack, or the mortar joints between them open. Sections of liner shift sideways, leaving offsets. Those gaps let heat and exhaust reach the brick around the liner, and in the worst case the framing beyond it. A chimney can look perfectly normal from the yard and the firebox while the flue inside is no longer able to contain a fire safely.

Signs to Look For Right Away

After a quake, before calling anyone, you can check a few things from the ground and the room:

• - Cracks in the brick or stucco, especially at the roofline or running diagonally across several courses.
• A gap between the chimney and the house wall that was not there before.
• The chimney leaning, even slightly. Compare it to a corner of the house.
• Bricks or pieces of the crown on the roof or in the yard.
• Debris, mortar or tile fragments in the firebox or on the smoke shelf.
• A damper handle that sticks, or a plate that will not shut flush anymore.

If you see a lean, a large crack, or loose brick at the top, stay away from that side of the house, and do not use the fireplace. If you see nothing, that is good news but not the whole answer, because the flue is where the hidden damage sits.

What an Inspection After an Earthquake Involves

NFPA 211 names earthquakes among the events that call for a Level 2 inspection. That means a recorded camera run up the full flue, plus everything in a visual check and the attic and roof areas beside the chimney. Ours is $380, with flue count, stack height and roof access deciding the figure.

Our report for a post-quake inspection does a few specific things:

• - Marks every crack, open joint and offset by its height above the damper, with a still from the video.
• Separates fresh damage from older damage where the photos allow. Fresh cracks have clean, sharp edges. Old ones carry soot and staining.
• Maps exterior cracks by face and course, distinguishing earthquake cracking from ordinary weather wear.
• Rates every finding safe to use, watch it, or fix before the next fire.
• Includes the full video file for an insurer or contractor.

That separation matters for insurance. If you carry earthquake coverage, an adjuster will want to know what the quake did and what was there before it. A dated report with video is the clearest evidence you can hand them.

What Decides the Repair

Three things decide what happens after the report: the kind of damage, where it sits, and whether the chimney above the roof is still sound. Cracked or offset liner sections usually mean relining with a stainless steel liner. Open joints in the outside brick mean repointing. A chimney cracked through at the roofline, leaning, or with loose brick at the top usually needs the section above the roof rebuilt, and that gets its own written assessment before any price is given.

Where the video shows enough, our next-step page gives a written price for each repair, numbered to its finding. If you want to know what a post-quake inspection would cost for your house, send the address and a photo of the chimney. We will reply with the price and the first open slot.

Rebuilds and What Has Changed Since 1994

When a chimney needs rebuilding after an earthquake, the work is done to current building code, with a permit and city inspection. A rebuilt section is reinforced and anchored to the house framing in ways the original was not. Some owners choose to replace the top section with a lighter framed chase and metal flue instead of brick, which is less heavy above the roof. Our rebuild assessments lay out the options side by side.

We photograph each stage of a rebuild, including the reinforcement before it is covered, because once the brick is up there is no other way to show it is there. Those photos and the permit sign-off become part of the completion report.

Do Not Wait for the Cold Weather

Earthquakes do not keep to the burning season. A quake in summer can leave damage that goes unnoticed until the first fire in November. If you felt real shaking, book the inspection while the memory is fresh and the weather is dry, so any repair can be done before the fireplace is needed.

Booking in Woodland Hills

We inspect chimneys after earthquakes across Woodland Hills, Canoga Park, Tarzana, Encino, Sherman Oaks and the rest of the Valley. Call us with the phone button on this page, tell us what you noticed, and we will tell you the level and price on the call.