Blown In Insulation in Kensington - Same-Day Service, Done Right the First Time

Fast, Reliable Blown In Insulation Across Kensington

Blown in insulation in Kensington typically costs $1.80 to $3.50 per square foot installed, with most attic jobs running $2,200 – $4,800 and wall retrofits in pre-WWII homes ranging $3,500 – $7,500. We’re usually on Arlington Avenue, Berkeley Avenue, or the streets off The Alameda within 45 minutes of a call, and we schedule most Kensington jobs within two business days.

Call (864) 428-1615

We know these streets. Our Blown In Insulation crews have worked the narrow wall cavities of 1920s Spanish Colonials near Kensington Circle and the uninsulated attics of Craftsman bungalows off Colusa Avenue. The marine layer here isn’t abstract, it’s the fog that rolls in thick enough to wet your windshield at 10 a.m. in July. That moisture changes what goes into your walls. Get it wrong, and you’re trapping humidity against wood that’s already been cold and damp for a century. Call (864) 428-1615 for a free written estimate, or read on to see how we handle Kensington’s specific conditions.

Why Aspen Attic Insulation Is Kensington’s Preferred Blown In Insulation Company

We’ve been called to enough Kensington homes to recognize the pattern before we pull a wall. The 1920s – 1940s wood-frame construction, the lath-and-plaster interiors, the original sheathing with no insulation behind it, these aren’t footnotes. They’re the starting point for every job we bid.

Our technicians arrive by name and photo, sent to your phone before anyone knocks. Every tech is background-checked, identity-verified, and wears a clean marked uniform with a photo ID badge at the door. If someone else shows up, the visit is free and we make it right. That’s The Threshold Standard, and it applies to every Kensington homeowner, whether you’re home alone, raising kids, or just tired of not knowing who’ll pull into your driveway.

Our 365-Day Done Right Promise covers every job in writing. Labor and materials, full year. If a repair fails, we come back free. No exceptions, no phone-tag. A live person answers our line 24/7, not a voicemail loop.

Dispatch and scheduling for Kensington run through our San Francisco Bay Area office, but the crew that shows up at your door lives and works locally. They know the difference between a fog-heavy morning near the hilltop and the slightly drier pockets toward Arlington Avenue. That local familiarity saves time and prevents the moisture mistakes that ruin insulation jobs in older homes.

Blown In Cellulose Insulation in Kensington

Blown In Cellulose Insulation in Kensington is our most common recommendation for pre-WWII homes with narrow wall cavities and moisture-sensitive sheathing. We install loose cellulose fibers, typically GreenFiber or CertainTeed, blown at dense-pack density into attic floors and wall cavities to fill gaps that batt insulation can’t reach. In Kensington’s 1920s – 1940s housing stock, cellulose performs well because it manages vapor better than fiberglass when installed with proper density and air-sealing. Most attic jobs run $2,200 – $4,200, while dense-packing walls in a typical Craftsman bungalow ranges $3,500 – $6,500 depending on cavity depth and access.

Moisture Management in Older Walls

Kensington’s fog-driven humidity means we never blow cellulose into a wall without first checking the sheathing condition and verifying the cavity can dry. On a Spanish Colonial on Arlington Avenue, our crew pulled a plaster wall and found the original sheathing furred out with damp, crumbly wood and no cavity insulation at all. Moisture from the marine layer had been condensing there for decades. We dried the bays, verified the sheathing would stay vapor-open, and blew GreenFiber cellulose at dense-pack density so the wall could still manage vapor rather than trap it. The homeowner got warmer rooms and stopped the slow rot cycle.

Dense-Pack Technique for Narrow Cavities

Pre-WWII Kensington walls often measure 3.5 inches or less, with irregular framing and lath protrusions that create voids. We use a two-hole method, drilling through exterior siding or interior plaster at strategic points, then pack cellulose at 3.5 pounds per cubic foot minimum. This density prevents settling and creates an air barrier without the rigid foam that can trap moisture in fog-prone climates.

Blown In Fiberglass Insulation in Kensington

Blown In Fiberglass Insulation in Kensington works best in attics with adequate ventilation and modern vapor management, or as a cost-effective top-up over existing insulation in homes that have been previously upgraded. We blow loose fiberglass, typically Johns Manville or Knauf, into open attic spaces to achieve consistent R-value without the compression common with batt installation. In Kensington’s damp climate, we use fiberglass only where we can confirm the attic isn’t receiving fog-season condensation through bypasses from the conditioned space below. Attic jobs with fiberglass typically run $1,800 – $3,800, with premium high-density products toward the upper end.

When Fiberglass Makes Sense

Fiberglass doesn’t absorb moisture the way cellulose can, which sounds like an advantage. In practice, that means it also doesn’t alert you to a problem, wet fiberglass can sit against sheathing for years while mold grows underneath. We use fiberglass in Kensington attics only after sealing bypasses, verifying soffit and ridge ventilation, and confirming the space stays dry through fog season. For wall cavities in pre-WWII homes, we rarely recommend fiberglass alone.

Ventilation Requirements

Blown fiberglass needs room to perform. In Kensington’s older homes with original eave vents blocked by decades of paint or retrofit work, we clear and restore airflow before blowing anything. A fiberglass job in a sealed attic is a future mold job. We check first.

Trusted Brands We Service in Kensington

We stock materials from eight industry-leading brands, including Johns Manville, Knauf, and CertainTeed, with product lines selected for the Bay Area’s marine climate. For Kensington’s pre-WWII homes, we typically specify CertainTeed’s vapor-permeable blown fiberglass or Johns Manville’s formaldehyde-free fiberglass for ventilated attics, and GreenFiber’s borate-treated cellulose for dense-pack wall work where moisture management matters most. Having multiple brands on hand means we’re not forcing a one-size-fits-all product into a cavity that needs something specific. Most Kensington jobs start within 48 hours of estimate approval because we don’t wait on special orders.

Common Blown In Insulation Problems We See in Kensington Homes

• Fiberglass compressed against damp sheathing in narrow wall bays. In 1930s Kensington bungalows, blown fiberglass stuffed into unvented 3.5-inch cavities presses against cold, fog-wetted sheathing. The fiberglass loses R-value, the sheathing stays wet, and neither the homeowner nor the inspector sees the problem until the wall comes open.
• Cellulose degraded by attic condensation in homes with no vapor management. Fog-season humidity rises through bypasses around chimneys and top plates, condensing on the underside of roof decking. Blown cellulose in an unsealed attic absorbs this moisture, compacts, and feeds mold while the homeowner wonders why the upstairs smells musty every winter.
• Settled material from skipped air-sealing around lath penetrations. Pre-WWII Kensington walls have dozens of lath nail holes, gaps at the top plate, and balloon framing that connects floors. Without sealing these first, blown-in material settles into the stud bay below or leaks into the basement, leaving the intended cavity half-empty and the heating bill unchanged.
• Retrofit jobs that ignore the existing rot cycle. We find hidden rot in Kensington sheathing more often than homeowners expect. Blowing insulation over compromised wood, or into a cavity that can’t dry, accelerates decay. We inspect sheathing condition before we bid, and we tell you what we found even if it changes the scope.

Pricing for Blown In Insulation in Kensington, CA

We Also Serve Cities Near Kensington

Our crews work throughout the Bay Area and beyond. If you’re outside Kensington proper, we also provide Blown In Insulation in Kensington and surrounding communities including Los Angeles, San Diego, San Jose, and San Francisco. Scheduling and dispatch for all locations run through our Bay Area office with the same Threshold Verified technician protocols and written pricing guarantee.

FAQs About Blown In Insulation in Kensington