What did Loma Prieta actually do to chimneys?

Seismic movement separates clay tile liner sections at their joints and cracks the tiles themselves. The stack above the roofline often shows visible damage and gets repaired; the liner inside frequently does not get looked at. If a property changed hands after 1989 with no record of flue assessment, that gap is still open.

We converted to gas logs. Does the chimney still need attention?

Yes, though not a sweep. Gas produces minimal creosote, so cleaning becomes largely unnecessary. Everything else continues: the flue still vents combustion products, the cap still corrodes, animals still get in, and the liner still ages. Gas systems fail quietly, which is the argument for looking at them on a schedule.

How do Spare the Air days affect maintenance?

They restrict burning, not servicing. The practical effect is that South Bay fireplaces accumulate deposits more slowly than their age suggests, so the annual question here is more often about condition than about cleaning.

Bay Area · 1,936,259 residents (2020 Census)

Chimney Services in Santa Clara County

A very large stock of mid-century masonry fireplaces, a major earthquake in living memory, and almost no documentation connecting the two.

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Chimney & Fireplace

Sweeping, inspection and repair

Wood, Gas & Factory-Built

Different systems, different work

Inspection Is Separate

Not bundled into a cleaning

California Service Areas

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Santa Clara County's residential build-out ran heavily from 1950 to 1985, and it put clay-tile-lined masonry fireplaces into an enormous number of near-identical houses. Those flues are now between forty and seventy-five years old. The county also took meaningful shaking in 1989, and the chimney damage from that event was frequently addressed at the visible level only. The combination — aging liners plus undocumented seismic history — is the county's defining chimney question.

What matters about Santa Clara chimneys

The 1989 Loma Prieta earthquake caused chimney damage across the county. Repairs commonly addressed the visible stack above the roofline without the clay tile liner inside being assessed.
Source: USGS
Residential build-out concentrated between 1950 and 1985 installed a very large inventory of near-identical masonry fireboxes with clay tile liners, now forty to seventy-five years old.
The county falls under the Bay Area Air Quality Management District, which declares mandatory Spare the Air no-burn days through winter and restricts device installation under Regulation 6 Rule 3.
Source: BAAQMD
Winter burn restrictions have driven substantial conversion to gas log sets, which reduces creosote but leaves venting, cap condition, animal intrusion and liner integrity entirely unaddressed.
Western foothill communities along the Santa Cruz Mountains front sit in elevated fire hazard terrain, where the spark arrestor required on every wood-burning chimney matters most.
Source: CAL FIRE

Valley Floor, West Valley Hills and South County

San Jose dominates the numbers, and The San Jose page covers its mid-century tract chimneys. The rest of the county splits three ways. In the north county cities, Palo Alto, Mountain View, Sunnyvale and Santa Clara, the housing runs older in places: Palo Alto's Professorville neighborhood is a historic district of houses from around the turn of the 20th century, and chimneys of that age call for softer, lime-based mortar when they are repointed.

In the west valley, the hillside parts of Los Gatos and Saratoga border the Santa Cruz Mountains, where fire hazard severity zones make the spark arrestor on a wood-burning chimney the first thing to check. Morgan Hill and Gilroy in the south county sit further inland, with warmer summers and more semi-rural property than the valley floor.

Fifteen Cities and the County

Santa Clara County has fifteen incorporated cities, and each issues its own building permits. Permits for installation, relining or rebuild work come from the city where the house sits. Unincorporated pockets, including Cambrian Park and parts of Alum Rock next to San Jose, are permitted by the county instead.

Burn rules are the one thing that does not change across the county: all of it is under the Bay Area Air Quality Management District, so a Spare the Air alert applies in Gilroy exactly as it does in Palo Alto.

Cities in Santa Clara County

San Jose

1,013,240 residents (2020 Census)

Other cities we serve in Santa Clara

Sunnyvale · Santa Clara · Mountain View · Milpitas · Palo Alto · Los Gatos · Saratoga · Campbell · Morgan Hill · Gilroy

Nearby counties

Alameda County Contra Costa County

Santa Clara County — common questions

It is extremely common in this county, which is rather the point. A flue of that age has had over fifty years of heat cycling plus a significant regional earthquake, and the condition of the clay tile liner cannot be established from the firebox. That assessment is the useful first step.

Not sure which service you need?

Tell us what the chimney or fireplace is actually doing and we will tell you which service applies — including when the answer is that you do not need one yet.

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