A peaceful Central California residential street lined with single-family homes — Los Altos, California service area

Insulation Services

Insulation Installation in Los Altos, CA

Name: 101 Exterminators Inc.
Address: 635 Sanborn Pl Ste 12, Salinas, CA, 93901, US
Telephone: (831) 500-1613
Price range: $$
Rating: 5

101 Exterminators handles insulation installation in Los Altos after removal or exclusion work — blowing cellulose or fiberglass to a target R-value and installing batt in crawl-space joist bays. Licensed in California under SPCB Lic. #9119 since 2005. A 1950s or 1960s ranch attic was insulated to the expectations of its day, and California Title 24 has been rewritten many times since that ceiling went in.

(831) 500-1613Free pest evaluation · no obligation

Local Context

Los Altos Attics Get Reinsulated After Rats, Not After a Cold Winter

The trigger here is contamination, not comfort. Los Altos winters stay mild and the city almost never gets a hard freeze, so a thin attic never announces itself the way it does in a town that frosts. The moment a Los Altos attic actually gets reinsulated is usually the moment right after rodent-contaminated material was vacuumed out of it — which means the decision about what goes back in gets made under time pressure, by a homeowner who was not planning an energy project.

That is also the one moment when the whole job is easy. The attic is empty, the crew is already up there, and three things can happen at once: air-sealing at top plates, flue chases and recessed light housings; confirmation that the roof plane is sealed against re-entry; and a choice of material. Borate-treated cellulose carries inherent pest resistance, which is worth something in a city where the framing directly above that insulation has a sixty-year drywood termite history. Title 24 targets for California attics run well above the depth a postwar build carried.

Post-and-beam houses do not get this opportunity. An Eichler roof deck is the finished ceiling, so there is no cavity to blow — insulation goes above the deck, which realistically means during a roof replacement. Raised-floor ranch houses have a second option most owners never consider: fiberglass batt between the crawl-space joists, which pairs naturally with vapor barrier work and addresses the cold floors people in these houses complain about every February.

How We Work in Los Altos

We measure existing depth, note where air sealing is needed at top plates, flues and can lights, and confirm the attic is rodent-free and the roofline sealed before any material goes in. Blown cellulose or fiberglass is installed to the target R-value with depth markers left in place so anyone can verify it later. Crawl-space joist bays get fiberglass batt where under-floor insulation makes sense. Because most Los Altos ranch attics are entered from a hallway scuttle, we run hose from outside rather than carrying bags through the house.

Los Altos Climate

Los Altos has a warm Silicon Valley climate with summer temperatures reaching 84–92°F and mild winters with 15–17 inches of rainfall. Its central valley position gives it consistent temperatures without the hillside extremes of Los Gatos or Saratoga. The mature tree canopy throughout the city creates a slightly cooler, more humid microenvironment at the street level that maintains Argentine ant activity and soil moisture year-round.

Housing Stock

Los Altos is defined by its 1950s–1960s ranch homes on well-maintained lots throughout virtually the entire city. These homes — now 60–70 years old — represent the heart of the drywood termite risk in Los Altos: original wood framing, original window trim and exterior siding, and crawl spaces that have been aging for decades. Custom and newer construction exists in smaller quantities near the hills adjacent to Los Altos Hills.

Why Local Expertise Matters

Los Altos' uniformly established 1950s–1960s housing stock means the entire city faces a similar generation of termite vulnerability simultaneously — we see this reflected in the consistent inspection findings throughout the city. Our 20 years of service in Los Altos gives us a thorough understanding of where drywood termite activity concentrates in this specific housing era.

Warning Signs

Signs You Need Insulation Install Service in Los Altos

Blown-in cellulose or fiberglass installation to achieve target R-value (typically R-38 to R-60 for California attics). Crawl space joist bay fiberglass batt installation for under-floor insulation. We work to California Title 24 standards and can provide documentation for permit purposes when required.

Attic insulation below R-19 or compressed to less than 4 inches — significant energy loss

Recent insulation removal that needs replacement

Home failing energy audit or experiencing higher-than-expected heating/cooling costs

Crawl space floor insulation missing or falling from between joists

How It Works

Our Insulation Install Process in Los Altos

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

Existing Conditions Assessment

We measure current insulation depth, note any areas requiring air sealing before installation, and confirm that the attic is rodent-free before new insulation goes in.

Air Sealing (As Needed)

Gaps around recessed lights, plumbing penetrations, HVAC ductwork, and top plates are sealed before insulation is blown in to maximize thermal performance.

Insulation Installation

Machine-blown cellulose or fiberglass is distributed to uniform depth and density across the attic floor or specified area. Depth gauges are placed and photographed for documentation.

R-Value Confirmation

Installed depth is documented and final R-value confirmed. For permit applications, we provide the necessary documentation of materials and installation specs.

Why 101 Exterminators

Insulation Install You Can Count On in Los Altos

Title 24 Compliance

We install to California energy standards with documentation for permit and utility rebate purposes.

Pest-Resistant Options

Borate-treated cellulose provides both thermal performance and inherent pest resistance — termites and cockroaches avoid borate-treated materials.

Common Questions

Insulation Installation FAQs for Los Altos

What R-value should a Los Altos attic be insulated to?

California Title 24 targets for attics in this climate zone generally land in the R-38 to R-60 range, well above what a house built in the 1950s or 1960s originally received. The right number for your house depends on the framing depth, whether there is HVAC ductwork in the attic, and how much air sealing gets done first. Air sealing matters more than most people expect — adding depth over unsealed top plates and can-light housings just insulates a leak.

Is borate-treated cellulose worth it in a Los Altos attic?

In a city where the framing above the insulation is around sixty years old and has a drywood termite history, it is a reasonable choice. Borate-treated cellulose resists insect activity within the insulation itself and does not become nesting material as readily as untreated fill. It is not a termite treatment and it does not protect the framing — it addresses the insulation layer only. We install it alongside the actual structural work rather than presenting it as a substitute for it.

Can an Eichler in Los Altos be insulated without replacing the roof?

Options are limited, because there is no cavity to fill. The roof deck is the ceiling, so added insulation normally goes above the deck as rigid board during a re-roof, which is why most Eichler owners time the two together. In the meantime the meaningful gains are elsewhere: sealing perimeter and penetration gaps, insulating the garage ceiling where one exists, and addressing glass. We will tell you plainly when the answer is to wait for the roof rather than sell work that will not perform.

Local Pest Pressure

Common Pests We Treat in Los Altos

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

Drywood Termites

1950s–1960s ranch homes throughout Los Altos have original wood framing that is now 60–70 years old — prime territory for established drywood termite colonies

Argentine Ants

Supercolonies extend throughout the fully-developed residential grid, supported by the consistently irrigated landscaping that maintains soil moisture year-round

Roof Rats

Dense mature urban tree canopy throughout Los Altos provides widespread arboreal rat habitat with direct roofline access to older homes via overhanging branches