Home insulation in Gilroy CA - a house that stays comfortable upstairs and down
Hot upstairs or cold floors? We check your attic, fix what comes first, then insulate so the house holds steady.
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Does my house in Gilroy need more insulation?
Home insulation in Gilroy is the work of adding or replacing insulation in your attic, walls or crawl space so the house holds its heat in winter and keeps it out in summer. At Thermal Gilroy Spray Foam Insulation, it always starts with a look at what you already have.
We're based in Gilroy and work in the cities around it, north into Santa Clara County and south toward Hollister, Salinas and Watsonville. Most calls I get start with a hot upstairs, a drafty room over the garage or a power bill that keeps climbing, and plenty come from people who just bought an older place and have no idea what's in the attic. The price moves with the size of the attic, how many inches are already up there, whether old material has to come out and how much sealing and repair has to happen before anything new goes down. The schedule turns on those same repairs and on how easy your attic is to get into. When I come out, you get a written plan that lists what needs fixing first and what we'd do after, so you can see the whole order before you decide.
How we handle home insulation, step by step
A lot of calls start with whether the attic needs more, so the first thing I do is go up and see how deep the insulation sits, and if you already have plenty, I'll tell you so. Next I look for anything insulation would only hide, like a roof leak, damp spots or an old wiring problem, because those get fixed before anything new goes down. If I find vermiculite, a light, flaky gray mineral that may contain asbestos, we leave it alone until an approved lab tests it, and your local health department can name a lab. Then our installers do the air sealing, closing the gaps around pipes, wires, can lights and the attic hatch, since sealing the attic floor first saves energy and helps keep moisture problems out of the attic. Can lights without an ICAT rating, the label that says they're made to sit in insulation and hold back air, get covers during that prep. Last, the insulation goes in, kept clear of the eave vents so the attic still breathes and laid as deep at the edges as in the middle.
Foam seals air while it insulates, but it costs more, so for most attics I'd rather seal the gaps and top up with blown-in, which is loose fill blown through a hose, unless your ductwork lives up there and foam is worth the extra. When the old material is soaked or full of droppings, it comes out first through insulation removal, because new insulation laid over it just keeps the problem. If the complaint is cold floors rather than a hot upstairs, the fix may be under the house, and that's crawl space insulation.
Home insulation in Gilroy's warm summers and cool winters
One firm that prepares state energy compliance reports puts Gilroy in California Climate Zone 4, a moderate inland climate with warm summers and cool winters, so your house has to handle both a baking upstairs in August and chilly floors in January. The zone matters because California's Energy Code sets efficiency requirements for changes to existing homes, and several of its standards depend on which zone a house sits in, so we plan your job around your zone and the current code. If your job needs a permit, we pull it and set up the inspections with the city or county office, and we'll talk that through at the estimate.
Around Gilroy we see a lot of older homes with thin, packed-down attic insulation and rooms over the garage that never feel right, and the same calls come in on jobs in Morgan Hill and Hollister. In older houses I look hardest at the wiring and the old fill before we plan anything.
- Call (669) 205-6284
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
- Gilroy, CA 95020
What happens when you call us about home insulation?
Call or send the form
I answer, or I get back to you, and I'll ask a few questions about the house. How old is it, and which rooms run hot or cold?
I look over the attic
I come out, check the attic, walls or crawl space and note anything that needs fixing first. You get a written plan that shows those fixes, what we'd install and what's driving the price.
Our installers work in order
Our installers handle repairs, sealing and then insulation, in the order the plan lays out. I check in along the way, and if something new turns up once the attic is open, I'll tell you before anything changes.
We walk the finished job
Before we pack up, I go over the finished work with you. You'll see the sealed gaps, the clear vents and the depth at the edges for yourself.
Why Gilroy homeowners call Thermal Gilroy Spray Foam Insulation for home insulation
The owner writes your estimate
I come out myself to look at the job and write the plan, and I'm the one who checks the finished work with you. You deal with the same person from the first look to the last, so nothing gets lost between the office and the crew.
Running jobs in Gilroy since 2021
I spent years scheduling crews for a busy company and learned insulation working beside the installers, then started this business in Gilroy in 2021. That's why every job here runs in a set order, with the fixes first and the insulation last.
Licensed and insured on every job
We're licensed and insured, and I'm happy to show you the paperwork when I come out for the estimate. You should know who's covered before anyone climbs into your attic.
On an insulation job, the order matters more than the material, so send me a few details about your house and I'll set up a time to come take a look.
Request an estimateGet a written insulation plan for your Gilroy home
We reply within 1 business day, and the estimate is free, done on site and comes with no pressure to book. I'll come look at your attic, walls or crawl space, 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 home insulation in Gilroy
How do I know if my attic needs more insulation?
If the insulation sits level with or below the floor joists, so you can easily see the joists, your attic should get more. If it sits well above them, you probably have enough, and adding more may not pay for itself. A flashlight from the hatch is usually enough to tell.
What does attic insulation cost around San Jose?
Attic insulation in the San Jose metro area usually costs about $1,800 to $6,000 per job, and that's the going rate across the area, not our price. Your own number depends on how big the attic is and how much has to happen before new material goes in, and it comes with the written plan after I look at your house.
What has to be fixed before insulation goes in?
Wet insulation, rotted framing, poor ventilation, vents blowing moist air into the attic and knob and tube wiring all call for a professional before new insulation goes over them. Covering any of those just hides the problem, so they go first on the plan.
Who can install insulation in Gilroy, California?
California's Contractors State License Board has a license class for insulation contractors, covering people who install insulating material for temperature or sound control. An unlicensed person may take on only minor work up to $1,000, and only when the job needs no permit and they have no employees.
How do I make sure sealing my attic is safe with a gas water heater?
Have a Home Performance Contractor test your gas or oil appliances before and after sealing, because a tighter house can sometimes push exhaust from a naturally venting appliance back indoors. Tell me what you've got at the estimate so it's part of the plan from the start.
Do we have to leave the house while you insulate?
For air sealing and blown-in insulation, most families stay home and just keep kids and pets away from the work area. Spray foam is different, because the foam maker sets a re-entry time, which is when it's safe to come back inside, and we follow it. I'll tell you ahead of the work day whether you need to plan to be out.
Other insulation work we do
Insulation removal
When the old insulation is wet, moldy or full of rodent droppings, it comes out before anything new goes in.
Crawl space insulation
Cold floors and a chilly first story often trace back to the open space under the house.
Book an attic check for your house
When you call, it helps to know where the attic hatch is, whether you have recessed lights and what gas or oil appliances you run, so the first visit covers it all.
Request an estimateCall (669) 205-6284