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A mid-century modern Eichler-style home in a Silicon Valley neighborhood — San Mateo, California service area

Structure Fumigation

Fumigation in San Mateo, CA

101 Exterminators performs structural fumigation in San Mateo when a drywood termite infestation has spread past what local treatment can reach, using Vikane (sulfuryl fluoride) under SPCB Lic. #9119. Older Baywood and Hayward Park houses hold decades of framing behind lath, plaster and stucco, where evidence in three or four separated members rarely means only three or four galleries. We inspect before we recommend it.

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Local Context

Plaster, Stucco and Ninety Years of Framing Hide What Spot Treatment Has to Reach

Tenting is decided by reach, not by how alarming a single finding looks. Drywood termites (Incisitermes minor) live entirely inside wood, and one structure can hold several unconnected colonies at once. In San Mateo's pre-1940 stock — the Craftsman bungalows of Hayward Park, the period-revival and Spanish Colonial Revival houses in Baywood and on the older blocks around Central Park — framing sits behind lath and plaster inside and stucco outside. Drill-and-inject works well when we can find and reach a gallery. It does nothing for the one two bays over.

The 1950s and 1960s houses hide wood a different way. Low-slope roofs, wide overhangs and exposed beam ends let drywood termites in above the ceiling plane, and once galleries run through a beam that continues from the eave through to the interior, there is no accessible face along most of its length. Gas reaches all of it because it travels as a gas — into joints, voids, checks in the wood, and the parts of a roof assembly nobody can open without demolition.

San Mateo also makes tenting logistically specific. Lots in San Mateo Park and Baywood are close-set with mature trees over the roof, and much of the Bay Meadows and Hillsdale housing is attached or multi-unit, which limits what can be tented at all. Both facts belong in the recommendation, not in a surprise on the day of the job.

How We Work in San Mateo

Before we recommend tenting a San Mateo house we map every finding — attic, eaves, garage framing, window and door headers, and any accessible sub-area — and show you why the evidence is not localized. If it is localized we say so and treat it locally instead. When fumigation is the right call we run the whole sequence: preparation checklist, tarping and sealing at the foundation, neighbor notification, monitored gas introduction, aeration, and clearance readings by a certified clearance company before anyone re-enters.

San Mateo Climate

San Mateo sits 46 feet above the bay with a mild Peninsula climate. January lows average about 42°F and September highs about 78°F, and rain arrives on roughly 60 days a year for a total near 19 inches. Nothing in that range forces a winter shutdown. Argentine ants forage through January, and wall cavities stay warm enough that drywood colonies keep working between swarms. Drywood swarmers fly in the late-summer window, August through October, on warm afternoons at the end of a heat spell; subterranean swarms come with the rains, February through May.

Housing Stock

Three building eras stack up inside one city. The oldest, in Hayward Park, Baywood, San Mateo Park and North Central, dates to the estate subdivisions that followed 1906: dense old-growth redwood and Douglas fir framing, raised foundations, and crawl spaces a technician can actually get into. Post-war tract blocks fill the middle of the city, most of them on shallow slabs with tight or no crawl access. Then there is Bay Meadows, built on the old racetrack from the 2010s onward, along with the lagoon-side blocks at Shoreview and Fiesta Gardens that went up on filled bay margin. A 1912 bungalow and a 2015 podium building do not fail the same way, and they do not get inspected the same way.

Why Local Expertise Matters

Peninsula escrow does not wait. A San Mateo listing that turns up Section 1 findings in a 1915 crawl space needs the report written correctly the first time, because the correction bid, the lender and the closing date all hang off it. We have been licensed in California since 2005, we hold SPCB License #9119, and our reports are filed with the Structural Pest Control Board. That experience covers both ends of San Mateo's range: original-growth framing in the pre-war neighborhoods and slab-on-grade construction at Bay Meadows.

Warning Signs

Signs You Need Fumigation Service in San Mateo

We manage the entire fumigation process: pre-fumigation inspection and documentation, structure tenting with certified fumigation tarps, introduction of Vikane fumigant to specified concentration, aeration protocol, post-fumigation clearance testing, and coordination with a certified fumigation clearance company before you return. We also provide bagging requirements and preparation guidance for food, medications, and plants.

Multiple locations of frass (termite pellets) throughout the structure — not just one area

Evidence of drywood termites in structural framing, not just surface wood

Previous localized treatments that have not resolved the infestation

Inspector-identified infestation in inaccessible areas (wall cavities, sealed areas)

WDO report showing extensive Section 1 conditions throughout the structure

Visible winged termites (swarmers) emerging from multiple locations

How It Works

Our Fumigation Process in San Mateo

Every job follows the same methodical approach — no shortcuts, no guesswork. Here is what to expect when you work with us in San Mateo.

01

Pre-Fumigation Inspection

We document all entry points, confirm the infestation scope, measure the structure for gas calculation, and review the preparation checklist with you at least 3 days before the fumigation date.

02

Structure Tenting

Our crew tents the entire structure with specialized fumigation tarps, sealed at the foundation to prevent gas escape. Neighbors are notified as required, and warning signs are posted.

03

Gas Introduction & Monitoring

Vikane is introduced to calculated concentration and held for the required exposure time. Readings are monitored throughout the process to confirm effective dosage.

04

Aeration & Clearance

The structure is thoroughly aerated until Vikane levels are below the safe entry threshold. A certified third-party inspector confirms clearance levels before we authorize re-entry.

Why 101 Exterminators

Fumigation You Can Count On in San Mateo

Complete Structure Coverage

Gas fumigant penetrates every void, cavity, and piece of wood in the structure — including areas impossible to reach with liquid or foam treatments.

Vikane — Industry Gold Standard

Vikane (sulfuryl fluoride) is the most widely used and thoroughly studied structural fumigant. It leaves no residual after aeration — the structure is safe to re-enter after clearance.

Third-Party Clearance Testing

Re-entry is only authorized after independent clearance testing confirms gas levels are below threshold. No guesswork on when your home is safe.

Real Estate Compliant

Fumigation clears all Section 1 termite conditions for real estate transactions. We issue the required Completion Notice accepted by lenders and escrow companies.

Common Questions

Fumigation FAQs for San Mateo

Can an attached townhouse at Bay Meadows or Hillsdale be fumigated?

Attached construction limits fumigation and sometimes rules it out. A tent has to seal to the ground around a complete structure, so an attached unit generally means fumigating the entire building rather than one address, which takes the association, the owner and every occupant coordinating. In much of San Mateo's attached stock we go to local treatment instead — drill-and-inject or borate work on accessible framing. The inspection decides which is realistic.

What happens to the mature trees over my Baywood house during a fumigation?

Limbs touching or overhanging the roof usually need trimming back before the tarps go on, and the crew protects landscaping at the tent perimeter. That is a real consideration in San Mateo Park and Baywood, where oaks and street trees often sit directly over the structure. We flag it at the pre-fumigation inspection so it becomes scheduled work instead of a morning-of problem. Houseplants come out; in-ground planting at the drip line gets covered as needed.

How do I know the gas is gone before my family goes back into the house?

Clearance is measured, not estimated. After the required exposure period the structure is aerated on a set protocol, and a certified clearance company takes readings inside before the seal is released and anyone re-enters. You do not go back in on our word alone — the clearance is documented. We hand you the preparation checklist for food, medications and plants well ahead of the date so nothing has to be sorted out that morning.

Local Pest Pressure

Common Pests We Treat in San Mateo

Every area has its own pest profile shaped by climate, housing, and geography. These are the pests we see and treat most often in San Mateo — tap any one to learn how to identify it and what treatment involves.

Drywood Termites

The estate subdivisions built after the 1906 earthquake left Hayward Park, Baywood and North Central full of century-old redwood and fir framing

Subterranean Termites

The low blocks around Marina Lagoon, Shoreview and Seal Slough sit on a shallow water table that keeps colonies foraging year round

Roof Rats

Mature street trees in the pre-war neighborhoods put branches on rooflines, which is how roof rats reach attics

Argentine Ants

Supercolonies in the older landscaped blocks come inside twice a year, first out of waterlogged nests and later in search of water

German Cockroaches

Restaurant density downtown and around Hillsdale sustains commercial German cockroach pressure that residential-only suburbs do not carry

Fumigation · San Mateo

Free Pest Evaluation in San Mateo

CA licensed and insured. Written estimate before any work begins. Urgent situations in San Mateo are prioritized.

Schedule an Inspection(831) 500-1613
Trusted by San Mateo families since 2005