Trusted Blown In Insulation for San Francisco Homeowners
Blown In Insulation pricing in San Francisco typically runs $1,800 to $4,200 for a standard attic, depending on square footage, current R-value, and material choice. Most jobs are completed in a single day. Alden Insulation San Francisco has run under The Garrison Standard since 2002, which means every homeowner gets a written price before work begins and a written 365-day guarantee after it ends. No revised numbers at the door. No vague arrival windows. If your attic has settled insulation, uneven coverage, or rooms that never hold temperature, call Bryce Holloway’s team at (559) 245-9792 and we’ll assess it properly.
San Francisco homes deal with a specific set of conditions: marine-layer humidity, fog that rolls in most evenings, older Victorians and row houses with minimal attic depth, and utility bills that climb when heat escapes through a thin ceiling. Blown in insulation addresses all of that by filling the entire attic cavity, including the edges and odd angles that batts always miss. We’re the home insulation specialists locals call when they want the job done once, correctly, with a paper trail.
Cellulose Insulation
Cellulose insulation is a dense, fire-retardant-treated material made primarily from recycled paper fibers, and it performs well in San Francisco’s damp, cool climate because it settles into irregular cavities and blocks airflow better than most alternatives. Homeowners choose it when they want high recycled content, strong sound dampening, and a material that fills every gap around wiring, pipes, and framing. Alden Insulation San Francisco installs GreenFiber cellulose, typically at $1,800 to $3,800 for a standard Blown In Insulation - San Francisco attic depending on depth and access.
Dense-Pack Installation
We compress cellulose into wall and ceiling cavities at a higher density than loose application. This reduces air infiltration, which in San Francisco matters more than most people realize because fog-driven humidity is constantly pushing against the building envelope. A dense-packed cavity holds its R-value longer and resists settling.
Coverage Depth by R-Value
San Francisco sits in climate zone 3, so the Department of Energy recommends an attic R-value between R-30 and R-60. Most older homes in the Sunset, Richmond, and Noe Valley have R-11 or less. We calculate the exact number of bags required to reach the target depth and show you that calculation in writing before any material leaves the truck.
Blown In Attic Insulation
Blown in attic insulation is the process of pneumatically filling an attic floor with loose material to a specified depth, which is the fastest way to bring an older San Francisco home up to a modern R-value. You need it when rooms on the top floor run ten degrees colder than the rest of the house, when the furnace cycles constantly, or when you can see bare ceiling joists in the attic. Alden Insulation San Francisco handles the full job, including air sealing and vapor checks, typically running $1,900 to $4,200 for a full attic.
San Francisco Attic Realities
Most San Francisco attics are tight, with low clearance, no flooring, and roof venting that was never balanced. Blown in material handles these conditions because the hose reaches where a person can’t stand, and the material fills the irregular corners that batts leave open. We check baffles and eave vents before blowing so your roof decking still breathes afterward.
Air Sealing Before Insulation
Blowing insulation over unsealed penetrations is like putting a jacket on over a hole in your shirt. Our crew seals top plates, around recessed light housings, and at plumbing and electrical penetrations before the blower fires up. That step alone typically cuts the air changes per hour in a San Francisco attic by 20 to 30 percent.
Blown In Cellulose Insulation
Blown in cellulose insulation refers specifically to loose, shredded paper-fiber material installed with a pneumatic blower, and it’s a strong choice for San Francisco homeowners who want better coverage than batt insulation without spending on spray foam. It fills fully around obstacles, and the material’s density naturally resists overnight heat loss. Alden Insulation San Francisco installs GreenFiber blown in cellulose, commonly between $1,800 and $3,800 per attic depending on target R-value.
How the Blower Changes Coverage
The pneumatic process creates a uniform layer across the entire attic floor, including under cross-bracing and around roof vents. Batts get cut, compressed, and misaligned during installation; blown in cellulose does not. The result is a continuous thermal layer with no seams where heat can escape.
Moisture and the San Francisco Climate
Cellulose manages moisture differently than fiberglass because the fibers can absorb and release humidity without losing performance. In San Francisco, where winter attics can hover near the dew point, that behavior reduces the risk of condensation on the underside of roof sheathing. We still verify venting and install vapor barriers where the building needs them.
Blown In Fiberglass Insulation
Blown in fiberglass insulation is loose glass-fiber material installed with a pneumatic blower, and it is often the lowest-cost path to a proper R-value in San Francisco homes. You choose it when budget matters, when you want a material that will never settle, and when you prefer a glass-based product over recycled paper. Alden Insulation San Francisco installs blown in fiberglass, typically $1,700 to $3,500 for a standard attic.
Why Fiberglass Won’t Settle
Fiberglass fibers are inorganic, so they do not compress under their own weight the way cellulose can over decades. Once blown to the target depth, the R-value stays where we set it. That makes it a good fit for shallow San Francisco attics where every inch of depth counts.
Coverage and R-Value Math
Fiberglass delivers about R-2.5 per installed inch at typical attic densities. For a San Francisco attic targeting R-38, that means roughly 15 inches of material. Our crew calculates the exact bag count, confirms the depth with a measuring stick at multiple points, and shows you the numbers before we pack up.
Loose Fill Insulation
Loose fill insulation is any insulation installed as a loose, blown material rather than a batt or board, and it is the standard solution for San Francisco attics with odd geometries, low clearances, or existing insulation that needs topping up. You need it when existing insulation is thin, uneven, or compacted from years of foot traffic and storage. Alden Insulation San Francisco installs loose fill in both cellulose and fiberglass, with most attics ranging $1,700 to $4,000 depending on material and depth.
Topping Up an Existing Attic
If the attic already has old batt insulation but it only measures R-11, we can blow loose fill directly on top to bring the total to R-38 or R-49 without removing the existing material. That approach saves on labor and disposal, and in San Francisco it usually cuts the total job cost by 20 to 30 percent compared to a full removal and reinstall.
Material Choice by Situation
We recommend cellulose loose fill when sound control and air blocking are priorities, and fiberglass loose fill when budget is the main constraint and depth is available. Both are installed with the same equipment and the same written price protocol. The decision comes down to your attic’s specifics, which we walk through on site before quoting anything.
Blown In Insulation Contractors
Blown in insulation contractors are specialized crews with pneumatic blowing equipment, depth gauges, and the training to air seal and vent properly, and the difference between a good one and a bad one shows up on your first PG&E bill. You need a contractor when the job involves full attic coverage, when existing insulation is degraded, or when the attic has ventilation issues that need correction before blowing. Alden Insulation San Francisco has run as a Blown In Insulation in Oakland style specialist since 2002, under The Garrison Standard, with background-checked, uniformed technicians on every visit.
What The Garrison Standard Means
Every Alden job includes a written price before work starts, a written 365-Day Done Right Promise after it ends, and a free return visit if any part of the work fails within that year. The crew shows up inside a scheduled window, in uniform, and answers to a live person on the phone 24/7. Nothing is verbal-only.
Why We Insist on Written Prices
San Francisco homeowners have sat through too many door-step revisions and vague “well, that depends” quotes. Our written price is based on measured square footage and target R-value, not a guess. The number you approve is the number on the invoice, no exceptions, and if the garage can’t fit the truck, we park legally or reschedule, we don’t bill you for the inconvenience.
Brands We Service
GreenFiber is our go-to for cellulose work, and we’re familiar with the full line including their treated low-dust products, which matters in San Francisco attics where dust control is a real concern. We calculate bag counts from the manufacturer’s coverage charts and install to the depth that delivers the R-value on the label, not a shallower pass that saves us material.
CertainTeed blown in fiberglass is a product we install regularly, and we know its coverage characteristics well enough to quote accurately without short-changing depth. Icynene and Demilec are spray foam lines we reference when comparing open-cell performance against blown in material, though blown in remains the cost-effective choice for most San Francisco retrofit attics. Whether you’re set on a specific GreenFiber or CertainTeed product or want a plain recommendation for your attic, we can work with it.
Signs You Need a Pro Right Now
- Rooms over the garage never warm up. In San Francisco homes built with FROG (finished room over garage) layouts, the floor cavity above the garage door is often uninsulated, and the result is a room that sits 10 to 15 degrees colder than the rest of the house all winter. Blown in insulation fixes the cavity without opening walls.
- You can see the tops of your ceiling joists. If the existing insulation only comes up to the joists or below, you’re running roughly R-11 in a climate that wants R-38 or more. That’s not a minor efficiency gap; it’s most of your attic’s thermal resistance missing entirely.
- Ice dams or condensation on winter mornings. Heat escaping into the attic warms the roof deck and causes condensation or, in the right conditions, ice buildup. You’ll see water stains on the ceiling or frost on the underside of the sheathing. Sealing and insulating stops the heat at the ceiling line.
- Your furnace cycles more than it should. A furnace that runs constantly in a San Francisco winter is often fighting a cold attic, not a failing heat exchanger. Re-insulating the attic reduces the run time and the PG&E bill, and the furnace works less all year.
- Rodent or pest activity in the attic. Rats, mice, and raccoons destroy insulation, compress it, and leave behind droppings and urine. If you’ve had pest remediation, the insulation needs removal and replacement, and blowing in fresh material closes the gaps the pests used as highways.
Our Process, Step by Step
- 1
Inspection and measurement. We walk the attic, measure square footage, check the current R-value with a depth gauge, look at venting and air sealing points, and document everything in writing. You get a written price based on those measurements, not a square-foot guess.
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Air sealing and prep. We seal top plates, around recessed lights, and at plumbing and electrical penetrations with fire-rated caulk or foam. We check baffles and eave vents and we cover any fixtures that shouldn’t be buried in insulation.
- 3
Blowing and depth verification. The blower runs outside with a long hose into the attic. We fill to the target depth, checking with a measuring stick at multiple points so no corner comes up short. The depth equals the R-value, and we record it.
- 4
Cleanup and inspection. We vacuum the access point, remove all material from the living area, and walk the attic one more time to confirm depth and coverage. You inspect the work with us before we pack the truck.
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Guarantee and documentation. You receive the written 365-Day Done Right Promise, a summary of the R-value achieved, and the product specs for your records. If anything fails within 365 days, we return at no charge. That’s the whole point of The Garrison Standard.
How Much Does Blown In Insulation Cost in San Francisco?
A typical Daly City Blown In Insulation project or San Francisco job runs $1,700 to $4,200 depending on attic size, target R-value, material choice, and whether existing insulation must be removed first. Small attics under 800 square feet tend toward the low end, while large attics over 1,500 square feet with removal of old material push toward the high end. Most standard homes in the Sunset, Richmond, Ingleside, and Bernal Heights land between $2,200 and $3,500.
What affects the price: the current R-value and whether you’re topping up or starting clean, the attic’s accessibility (crawl spaces and low slopes slow the work), whether air sealing is included, and the material you choose. Cellulose runs slightly higher than fiberglass per installed R-value but often delivers better air blocking, which is worth more in San Francisco’s fog belt. Avoiding overpaying is simpler than people expect: get a written quote based on measured square footage, verify the depth they’re promising, and don’t pay for R-value you’re not getting. Our free estimates include the full measurement, the target depth, and the written quote, and you keep that number regardless of whether you book.
Our Service Area Near San Francisco
Alden Insulation San Francisco serves the city proper plus the most of the Bay Area peninsula and parts of the East Bay. We run attics in Daly City and South San Francisco, San Mateo, Alameda, and Oakland, down through Danville, Pleasant Hill, and San Rafael, and across to Berkeley and Fairfax. Pacifica’s coastal homes get the same moisture-aware prep as city properties. If you’re in any of these areas, you deal with the same fog belt temperatures and the same old attic framing, and our response time runs same-week for most jobs. For homeowners further east, see our Blown In Insulation in Berkeley page.
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.
Frequently Asked Questions About Blown In Insulation in San Francisco
Blown in insulation is loose insulation material, either cellulose or fiberglass, installed with a pneumatic blower that fills an attic cavity completely and evenly. It reaches corners, edges, and around obstructions that batt insulation always leaves open. For San Francisco attics, it is the standard retrofit method because most older homes have irregular framing that batts simply don’t fit well.
A standard San Francisco attic takes one day, including prep, air sealing, blowing, and cleanup. Large attics over 1,500 square feet or jobs requiring full removal of old insulation may run into a second day, but we tell you that in writing before we schedule. The crew arrives inside the promised window and finishes the job in one visit in most cases. Call (559) 245-9792 and we’ll give you a realistic timeframe for your specific attic.
Most Blown In Insulation - South San Francisco and San Francisco projects run $1,700 to $4,200 depending on attic size, target R-value, material, and whether old insulation must be removed. A standard 1,000-square-foot attic with no removal typically lands between $2,200 and $3,200. The exact price depends on measurements we take on site, and you’ll have that number in writing before any work starts. Estimates are free.
Yes, we install GreenFiber cellulose and CertainTeed blown in fiberglass regularly, and we calculate coverage from the manufacturer’s own depth charts. If you’ve researched a specific product and want it in your attic, we’ll install exactly that and document the batch for your records. If you don’t have a brand preference, we’ll recommend the material that fits your attic’s conditions, and we’ll explain why it’s the right call before you commit.
Yes, we answer the phone 24/7 with a live person, not a voicemail, and we schedule emergency work when an attic is exposed, pest-damaged, or actively losing heat during a cold snap. San Francisco winters are mild but wet, and a torn-open attic is a liability we treat as urgent. Call (559) 245-9792 and a real person will take the details and get you on the schedule.
Every job includes the 365-Day Done Right Promise, a written guarantee that the work was done correctly and will perform for a full year. If any part of the installation fails within 365 days, we return at no charge, including a free second visit if needed. The guarantee is written on the invoice and signed, not promised verbally.
Clear a path from the front door to the attic access, move any stored items off the attic floor if the space is used for storage, and let us know about any existing leaks, pest issues, or wiring concerns before we arrive. We handle the rest, including floor protection and full cleanup. You don’t need to be home for the whole job, but we do ask that someone be present for the final walkthrough so you see the depth and coverage yourself.
Schedule Your Blown In Insulation Service in San Francisco Today
You’ll get a written price, a written 365-day guarantee, and a background-checked crew that shows up inside the window we promised. No revised numbers, no vague arrival times, no mess left behind. Call (559) 245-9792 for a free estimate and get your San Francisco attic working like it should. Bryce Holloway and the Alden team answer 24/7.
Written by Bryce Holloway, Owner at Alden Insulation San Francisco, serving San Francisco since 2002 under The Garrison Standard.