Spray foam insulation in Gilroy, CA - a house that stays cooler upstairs
Hot upstairs, a drafty room over the garage or a power bill that won't quit? We plan the job, then seal and insulate together.
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Is spray foam the right insulation for my attic?
Spray foam insulation is foam sprayed in place, so it seals air leaks and insulates in the same step. For Gilroy, CA homes we install it under the roof deck, where it gets into the awkward corners that are hard to seal any other way, and along the rim joists, the boards that cap the edge of your floor framing.
Most people call me when the upstairs bakes all summer, when the room over the garage never feels right, or when they've bought an older house and want to know what's in the attic. The price mostly turns on which foam you pick, how much area we cover and how thick, and whether old material has to come out first through insulation removal. The schedule turns on your roof, because any repairs come before the foam, and on lining up a place for you to stay while we spray. At the estimate I look at your house and walk you through a written plan with all of that laid out, so you see your own numbers before anything gets booked.
How we install spray foam insulation
First I ask about your roof's age and any past leaks, because foam sprayed under a roof deck that still leaks just hides the problem while the wood underneath can rot. Then we look for anything up there that needs sorting first, like old wiring, a gas appliance or soaked insulation, and we help you find somewhere to stay during spraying. On spray day our installers cover what needs protecting and spray the foam to the depth in your plan, keeping it as thick at the edges where the roof meets the walls as it is in the middle. Then we clean up, and I let you know your re-entry time, the point when it's fine to come back inside.
Foam isn't always the right call, and I'll tell you so. It costs more because it seals air while it insulates, but if your ductwork doesn't run through the attic, sealing the gaps around lights, pipes and the hatch and then topping up with blown-in insulation, loose fill blown in through a hose, usually makes more sense. When that's the better fit, we plan it as regular attic insulation and save the foam for spots like the rim joists or the room over the garage.
Spray foam insulation for Gilroy houses
California sets efficiency standards for the envelope of a house, the roof, walls and floors between you and the weather, by the climate zone the house sits in. So before I write your plan, I check which standards apply to your house, and we plan the foam type and depth around them.
On jobs around Gilroy we often find older houses with thin, settled insulation and the ductwork running through a hot attic, which is where foam under the roof deck makes the most sense, and we see the same thing on jobs in Morgan Hill and Hollister. If your place sits near brush or close to the neighbors, sealing the attic has another upside, because ash and embers get in through attic vents and unvented attics are described as much more fire safe in those spots.
- Call (669) 205-6284
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
- Gilroy, CA 95020
What happens after you call about spray foam in Gilroy?
Call or send us a note
Call (669) 205-6284 or use the form, and I'll pick up or call you back. I'll ask a few questions about the house, like how old it is and how many inches of insulation you think are up there now.
I come out and look
I check the attic, the underside of the roof deck and anywhere else foam might go, and I note anything that has to be fixed first. You get a written plan showing the foam type, the areas, any roof or appliance work that comes first and what it'll cost.
Our installers spray the foam
Once any roof repairs are done and you've got a place to stay, our installers do the work in the order the plan sets out. I check in during the job and tell you when you can come home.
We walk the finished attic
Before we pack up, I go over the finished job with you, including the edges, the corners and any fire covering the foam needs. That way you know exactly what's up there.
Why Gilroy homeowners call Thermal Gilroy for spray foam
The owner writes your estimate
I come out myself to look at the attic and write the plan, and I'm the one who goes over the finished job with you. You talk to the same person at the start and the end, so nothing gets lost between the visit and the work.
Jobs planned in the right order
We've been in business since 2021, and I came to it from years of scheduling crews, so the order of the work is the first thing I plan. Leaks, wiring and wet insulation get sorted before foam covers them up.
Licensed and insured in California
We're licensed and insured. California's contractor board requires a license even on small jobs under $1,000 when the contractor hires workers to help, so it's worth asking anyone who wants a crew in your attic.
If you're weighing foam for your house, book a visit and I'll start by asking about your roof.
Request an estimateGet a written spray foam plan for your attic
We reply within 1 business day, and the on-site estimate is free with no pressure to book. I come out, look at the attic and roof deck, note anything that needs fixing first and walk you through a written plan.
- Licensed and insured.
- Phone
- (669) 205-6284
- Location
- Gilroy, CA 95020
- Hours
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
Questions about spray foam in Gilroy
Should I pick open-cell or closed-cell spray foam for my Gilroy home?
Pick closed-cell foam when you need the most insulation in a tight space or want it to hold back moisture, and open-cell when sound and budget matter more. Closed-cell foam, the dense kind, is about twice as efficient per inch and can act as a vapor control layer, while open-cell is a much better sound barrier and costs less. I'll tell you which one I'd use where when I come out.
How much does spray foam insulation cost in Gilroy, CA?
A cost guide for nearby San Jose puts spray foam 3 inches thick over 1,000 square feet at about $2,000 to $4,500 per job. Open-cell foam usually lands at the lower end and closed-cell at the upper end. That's the area's going rate, not our quote, so I'll price your house after I've seen it.
How long do I have to stay out of the house after spray foam insulation?
Federal consumer safety staff advise leaving the home during installation and for at least 24 hours afterward. Emissions vary with the foam and the house, so ask your contractor for your own re-entry time before you plan where to stay. We help you line that up and call you when it's time to come home.
Does my roof need work before spray foam goes under it?
If it leaks or has damage, yes, because the guidance for foam under an existing roof is to inspect it and repair leaks and damage first. A roof at or near the end of its life may need replacing before you insulate, so get any roof work on the calendar ahead of the foam. Tell me the roof's age when you call and we'll plan around it.
Does spray foam need a fire barrier over it?
Some does. A thermal or ignition barrier, like a coating or drywall, goes over the foam wherever the product or the code calls for it, and not every spray foam needs one. Ask which way your foam goes, and you'll see the answer in your written plan.
How do I get my attic ready for spray foam insulation?
Start by telling us about any gas furnace or water heater in the attic, because once the attic is sealed those should be direct-vent, sealed-combustion units that vent straight outdoors. An attic that's sealed and brought inside the living space also needs a way to get rid of moisture, so we plan for that before anyone sprays.
Other ways to fix a hot attic
Attic insulation
When the ducts aren't in the attic, regular insulation over sealed gaps is often the better buy for a hot upstairs.
Blown-in insulation
Loose fill brings a thin, settled attic back up to depth without the cost of foam.
Book your spray foam estimate today
Have your roof's age, any past leaks and a list of what's in the attic, like a furnace or water heater, handy when you call (669) 205-6284 so I can plan the visit.
Request an estimateCall (669) 205-6284