Fast, Reliable Blown In Insulation Across San Francisco
Blown in insulation in San Francisco solves a set of problems you don’t see in most other cities. The fog belt pushes moisture into flat-roof homes, and pre-1978 construction rarely leaves you a clean attic to work in. Most blown in insulation projects we handle in San Francisco run $1,800 – $4,600, depending on square footage, current R-value, and whether we’re removing settled material first. Call (254) 272-5876 for a straight written price before any work begins.
Alden Attic Insulation sends background-checked, uniformed technicians for Attic Insulation in San Francisco to every neighborhood, from the Outer Sunset to Bernal Heights. We understand what marine-layer moisture does to loose fill and fiberglass in this city. The number you approve is the number on your invoice. Every job carries a 365-day written guarantee. No exceptions.
Why Alden Attic Insulation Is San Francisco’s Preferred Blown In Insulation Company
San Francisco homeowners call us because they’ve been burned before. A contractor no-shows, revises the price at the door, or leaves a mess in a crawlspace and never answers the phone again. Alden Attic Insulation operates under the Garrison Standard, the written operating code of the Garrison Partners family, established in 2002. That means a written price in your hand before a single tool comes off the truck, and a written guarantee that covers every job for 365 days.
Bryce Holloway leads our San Francisco operations, and he holds every crew member to the same standard. Technicians arrive in uniform, inside the scheduled window, not a vague half-day range. The moment you call (254) 272-5876, a live person answers. Not a voicemail. Not a form. That’s true at 9 a.m. on a Tuesday and it’s true at 2 a.m. the night the fog rolls in and your upstairs bedrooms drop five degrees.
We also install products from GreenFiber, Owens Corning, Johns Manville, and Knauf. You can look up every one of those brands on your own before we arrive. That’s how we want it.
Blown In Fiberglass Insulation in San Francisco
Blown In Fiberglass Insulation is one of the most common services we perform in San Francisco, and the way the job works depends heavily on your roof type. In a city where flat roofs and sealed joist cavities outnumber accessible attics, our team often blows fiberglass through a roof hatch or wall cavity rather than a pull-down stair. That’s normal for San Francisco. It’s not normal for most of the Bay Area, and it changes how the job is priced and how long it takes.
Homeowners in the Richmond and Sunset districts call us when upstairs rooms stay cold even with the furnace running. In many cases the issue isn’t the furnace at all. It’s fiberglass that settled years ago into a compressed mat near the roof deck, leaving gaps that funnel fog-belt cold straight into the living space. We remove the failed material, verify the cavity is sealed, and blow fresh fiberglass to the correct R-value.
What the job covers
We remove degraded or settled material when needed, then blow in new fiberglass to the specified depth and R-value. This includes checking the roof hatch, wall penetrations, and any chase where air moves between floors. If there’s a gap, we tell you. The written price covers what we found during the walkthrough, not a surprise discovered mid-job.
When replacement beats adding more
If the existing fiberglass has been damp, compressed, or disturbed by pests, adding more on top won’t fix it. We vacuum out the failed layer first. In pre-1978 San Francisco row houses, that step is often the difference between a fix that holds and one that fails again in two winters.
Loose Fill Insulation in San Francisco
Loose Fill Insulation is what most San Francisco homeowners picture when they think about blown in insulation, and in this city it’s often the right answer for flat-roof homes where batts won’t fit cleanly into odd joist bays. Loose fill settles into irregular cavities better than any other material. But marine-layer moisture is the wildcard. Loose fill that gets damp through a flat roof or an unvented crawlspace clumps, compresses, and loses R-value faster than most homeowners realize.
In the Outer Sunset and Richmond, we regularly remove loose fill that has absorbed fog moisture over years and compacted into a dense, cold mat. The fix isn’t more insulation on top. It’s removal, air sealing, and a fresh blow to spec. Our crew did exactly that on a 1930s row house in the Outer Sunset: we vacuumed out moisture-degraded loose fill, sealed the roof hatch and crawlspace, and blew in fresh GreenFiber. The homeowner reported the second-floor bedrooms held heat within a day.
GreenFiber and cellulose options
We install GreenFiber loose fill where homeowners want a recycled-content product with strong coverage in older San Francisco cavities. It works well in the city’s tighter joist bays and around irregular framing common in pre-war construction. We’ll tell you if it’s the right choice for your roof type.
Why air sealing matters in fog-belt homes
Loose fill can’t do its job if moist air moves through gaps around roof hatches, wall penetrations, or recessed light fixtures. In San Francisco, those gaps pull fog-damp air into the insulation layer. We seal them before we blow. It’s a small step that changes how long the material lasts and how well it insulates next winter.
Trusted Brands We Service in San Francisco
We install and remove insulation using products from Owens Corning, Johns Manville, GreenFiber, and Knauf, including Reflectix repair in San Francisco when needed. These aren’t obscure brands. Homeowners can research every one of them independently before committing to a single thing. We stock common materials for San Francisco’s housing stock, which means faster turnaround when you’re dealing with settled insulation in a Sunset or Richmond flat-roof home. If the brand matters to you, we’ll tell you exactly what goes into your attic cavity and why we chose it for your roof type and neighborhood.
Common Blown In Insulation Problems We See in San Francisco Homes
- Marine-layer moisture wicks into loose fill through flat roofs and unvented crawlspaces. This is the single most common problem in the Sunset and Richmond. The material clumps, compresses, and loses R-value, and the damage is invisible until rooms stay cold. We find it in most pre-1978 homes we service.
- Settled fiberglass from prior installs has blown into wall cavities and joist bays. Low spots and gaps let fog-belt air move straight into living spaces. Adding more insulation on top masks the problem for a season, but it doesn’t fix the gap underneath.
- Unsealed roof hatches and wall penetrations let blown material escape. In Bernal Heights and Noe Valley, we regularly find hatches that were never sealed after the last install. The insulation compacts or disappears, and pests move into the void. We seal before we blow.
- Upstairs rooms in row houses that stay cold regardless of the furnace setting. This often isn’t a furnace issue at all. It’s a coverage gap between floors or in the joist bays. We map the cavity, find the low spots, and bring the coverage back to spec.
Pricing for Blown In Insulation in San Francisco, CA
A typical blown in insulation project in San Francisco runs $1,800 – $4,600. Smaller jobs, like a single room over a garage or a row house cavity, land on the lower end. Full removal of moisture-degraded loose fill plus a fresh blow across a flat-roof home lands higher. Square footage, current R-value, roof access, and whether we’re removing failed material all move the number. What doesn’t move is the price once we’ve given it to you in writing. Call (254) 272-5876 for a free estimate with a written price before work starts.
We Also Serve Cities Near San Francisco
Alden Attic Insulation serves San Francisco and the surrounding Bay Area, including Daly City, Sausalito, South San Francisco, and Alameda. Our crews dispatch from the San Francisco Bay Area office and handle Blown In Insulation in San Francisco locally, with same-day response whenever the schedule allows. If you’re in a neighboring city, call us and we’ll tell you straight if we can get to you this week. Learn more about our Blown In Insulation services.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Blown In Insulation in San Francisco
Fog-driven moisture seeps through older flat roofs and unvented crawlspaces, soaking into your insulation until it clumps, compresses, and stops holding heat. You’ll notice it as upstairs rooms that stay cold no matter how long the furnace runs. The fix is removal, air sealing, and a fresh blow with material that hasn’t absorbed years of marine-layer moisture. Call (254) 272-5876 and we’ll tell you what we’d do for your specific roof.
Yes. We do it regularly in pre-1978 row houses across the Outer Sunset, Richmond, and Bernal Heights. No attic access means we blow through a roof hatch, a wall cavity, or a sealed joist space. It changes the process but not the outcome. A full R-value insulation layer in a row house is standard work for our Blown In Insulation crew.
We install GreenFiber, Owens Corning, Johns Manville, and Knauf. Each has a specific use case depending on your roof type, cavity size, and whether you want recycled-content material. We’ll name the brand for your job in the written estimate, and you can research it before saying yes.
We offer same-day response in San Francisco whenever the schedule allows, and every call is answered by a live person 24/7. If your upstairs rooms are suddenly freezing or you’ve found damp, settled insulation in a crawlspace, call (254) 272-5876. We’ll give you a real window and show up inside it.
In most Noe Valley homes, the answer is blown-in insulation, not a full system replacement. Cold upstairs rooms usually mean settled or gapped insulation in the joist bays, not a failed heating system. We’ll map the coverage, find the low spots, remove degraded material if needed, and blow fresh insulation to the correct R-value. The written price you get up front is the price you pay.
Written by Bryce Holloway, Owner at Alden Attic Insulation, serving San Francisco and the Bay Area as part of the Garrison Partners family since 2002.