Drafty rooms, a hot upstairs or noise through the walls? We fix what's wrong first, then spray foam that stops air and quiets the room.
Open-cell foam insulation is foam that Comfort San Rafael Insulation Services sprays into attics and other above-ground spaces in San Rafael, CA. It expands into the gaps air leaks through and is considered airtight at the usual thickness, so the rooms below stay more even and quieter.
Most calls start with a drafty bedroom, a hot upstairs or the room over the garage that never feels right. In older homes the cause is usually air slipping in around can lights, pipes and the attic hatch, plus old insulation that's settled or soaked. Foam stops that air. If the old stuff is wet or full of droppings, though, insulation removal comes first or the problem stays.
The price moves with the square footage, how many inches we spray, how much old material comes out first and how easy the space is to reach. The schedule turns on that prep, any permit, and a spray date your household can be away for. Your own figure comes in the written estimate I put together after I've looked at the space.
Open-cell foam suits a lot of San Rafael homes, but not every space or every household. These are the things I check before I recommend it for yours.
Open-cell foam lets moisture vapor pass through it, so in many cases it falls short of the requirements for walls below grade, the part that sits below ground level. We plan it mostly for attics and rooms above ground. A basement wall in the dirt is a separate question, and I'll answer it on its own.
When foam goes on the underside of the roof, the attic vents get closed off and the attic becomes part of the house. A space sealed like that still needs a way to get rid of moisture, so how that happens is settled before we spray, not after damp shows up in the framing.
Depending on the product and the code, the foam may need a fire barrier over it, which can be a coating, drywall or another layer. Not every spray foam needs one. The product and where it goes decide it, and if your job needs a cover, you'll see it in the estimate.
If anyone in the house has asthma, a skin condition, respiratory allergies or has reacted to isocyanates, the chemicals in spray foam some people react to, federal safety staff say to read the product information carefully and consider other insulation if needed. Tell me at the estimate, and we'll look at that together before anything's decided.
Here's how a spray foam job goes with us, from your first call to the walk-through, including the night or two you'll spend somewhere else.
Call (628) 234-2144 or use the form, and tell us which attic or rooms you're thinking about. We get back to you to set a time for me to come out and see the space.
I go into the attic, walls or crawl space and look for anything that has to be fixed first, like soaked insulation, droppings or open gaps around lights and pipes. Then I write up the estimate, with what needs doing and in what order.
If you go ahead, we handle any permit and set the spray date with you early, so you have somewhere to stay lined up. Then our crew preps the space, fixes and seals what needs it, and sprays the foam.
Once the foam is in, we clean up and I walk you through what we did, so you know what's in your attic or walls and when your household can come back inside.
I'd pick open cell when you want quieter rooms and a lighter budget, mostly in spaces above ground, like an attic over the bedrooms or the room over the garage. Under the house it's a different story, because damp coming up from the dirt is usually the first thing to fix, and a crawl space vapor barrier handles that better than foam.
Order matters more than the foam. New construction taught me how insulation is supposed to go in, and lived-in homes taught me the leaks and problems have to be dealt with first. So we pull out soaked or dirty material, fix what's wrong, and only then spray. If your attic isn't ready, I'll tell you that instead of selling you a job that won't help.
Business owners ask about foam too, mostly for offices and shops where noise between rooms matters. That work runs through our commercial insulation service, and the order doesn't change. We find the problems, fix them, seal, then insulate. The building is bigger, but the leaks are the same kind we find in houses.
Foam goes on the underside of the roof and the vents are closed off, so the attic and any ductwork up there end up inside the sealed house. It costs more and needs the moisture plan covered above.
If no ductwork lives in the attic, sealing the gaps and topping up with blown-in insulation, loose fill blown through a hose, usually does the job for less money. I'll tell you when that's the better buy.
Send us the attic or rooms you want done, a rough square footage and any health concerns in the house. We reply within one business day to set a visit, and the estimate is free, done at your home, with no obligation. I come out, look at the space and write up what it needs before anything goes on paper as a price.
(628) 234-2144In San Rafael, the city's Building Official issues the permit that's required before a building is altered or repaired. If your foam job needs one, we pull it and set up the inspection, and if it's not clear whether yours does, I'll find out before we start. California's Energy Code also sets efficiency requirements for work on existing homes, not just new ones. You can check requirements and inspections on the city's building permits page.
We're based in San Rafael and work in cities across Marin and nearby, from Petaluma down to Strawberry and over to Richmond and Berkeley. Most of what we see here is older houses with settled insulation, attics full of stored boxes and a room over the garage that runs hot or cold. If your city isn't named on the site, call and ask.
I come out myself to look at the job and write the estimate, so the person who climbs into your attic is the one who prices it. Our crew does the install, and I'm on site running it. I started this business in 2023, after my first years in the trade insulating new houses, to work on lived-in homes like yours.
We're licensed and insured. Every job is backed by our satisfaction guarantee. We take calls every day from 8 AM to 9 PM, so phoning after work is fine. When you're ready, call (628) 234-2144 or send us a message and tell me what's going on in your house.
If you run a shop, office or other building with drafts or noise between rooms, this is where we insulate and seal it with the same fix-first approach.
When damp rises from the dirt under your house, a ground cover sealed in place stops the moisture that open-cell foam would let through.
Open-cell foam jobs take us across Marin and over into Richmond and Berkeley. Pick your city below, and if you don't see it, give us a call and ask.
Open-cell spray foam covering 1,000 square feet at 3 inches thick usually costs about $2,200 to $3,300 per job in San Francisco, which is a fair guide for a San Rafael budget. Your price depends on your square footage, depth and prep. I'll give you your own figure in the estimate after I've seen the space.
For most rooms above ground where noise and budget matter, open-cell is the better fit. It has a lower R-value, how well insulation slows heat, but it blocks sound much better. Closed-cell foam, a denser foam that blocks moisture, does more per inch, which is part of why it costs more.
Plan on at least 24 hours after spraying ends. Federal product safety staff advise homeowners to leave during spraying and for at least 24 hours after. That's the whole household, so book somewhere to stay before the spray date, which is why we set that date with you early.
Clear stored boxes out of the attic or room we're spraying, and line up your stay away from home. Mention any health concerns at the estimate, and ask me to go over the safety steps before work starts. Our crew handles the rest of the prep, including fixing and sealing what needs it.
Contractors in the C-2 Insulation and Acoustical Contractor class with California's Contractors State License Board are licensed to install any insulation for temperature or sound control. Before you hire anyone for spray foam, ask what license they hold and check it with the board.
Call (628) 234-2144 or send a message, and one visit tells you whether your space can take foam now or needs work before anything gets sprayed.
