Air sealing services in Gilroy, CA - fewer drafts, sealed from the attic down
Drafty rooms, a hot upstairs or cold floors usually trace back to hidden attic gaps. We find them and seal them.
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Why is my house drafty when the attic already has insulation?
Air sealing services in Gilroy close the cracks, holes and gaps that let air move in and out of your house, which insulation by itself doesn't always stop. Think of insulation as a sweater and air sealing as the windbreaker you wear over it.
If the room over the garage won't cool down, the floors stay cold or the power bill seems high for the size of the place, air is probably slipping through gaps you can't see. The price mostly turns on how much old insulation sits on top of those gaps, how many pipes, wires and can lights run through the ceiling, and how easy your attic is to move around in. The schedule turns on whether something has to be fixed first, like a roof leak or old wiring, and whether you're adding attic insulation right after, so your own figure and timing come from the estimate.
How our air sealing service works
I start in the attic, because the leaks that matter most are usually hidden under the old insulation, and holes up high leak more air than holes down low. Our installers move the old insulation aside and seal around can lights, pipes, wires and the attic hatch, and if what they move turns out to be soaked or full of droppings, we talk with you about taking it out rather than covering the problem back up. We leave the soffit, ridge and gable vents and any combustion air ducts open on purpose, since those are meant to move air and the attic needs them to breathe. If you have a gas furnace, water heater, stove or fireplace, we check that it'll still get the fresh air it needs once the house is tighter.
Sealing often runs into the rest of the house. Down below, we handle gaps and heat loss together on basement insulation jobs, and where you'd rather seal and insulate in one layer, closed-cell foam insulation, a dense foam that also blocks moisture, does both at once. Foam costs more, so for most attics I'd seal the gaps and top up the loose fill, unless your ductwork lives up there.
Air sealing services in Gilroy and the California rules behind them
In California, anyone who builds or changes a building needs a license from the state licensing board once a job passes a set cost, and an older board brochure puts that line at $500 or more in labor and materials combined, so it's worth asking any crew for their license before they climb into your attic. The state's Energy Code also sets energy efficiency and indoor air quality rules for changes to existing homes, not just new ones, so ask your contractor how they apply to your house. I'll go over that with you when I come out.
Around Gilroy we hear a lot from people who've bought an older house and found thin, dusty insulation with years of gaps underneath, often with a gas furnace or water heater nearby, which is why that fresh air check is part of our plan. We see the same kind of attics on jobs in Morgan Hill and Hollister, and we work in the cities around Gilroy, north into Santa Clara County and south toward Salinas and Watsonville.
- 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 air sealing in Gilroy?
Call and set a visit
When you call, I usually pick up myself, and we find a time for me to come see the house. I'll ask about your gas appliances and anything you've noticed in the attic so I know what to look for.
I look over the house
I check the attic, walls and crawl space for old knob and tube wiring, vermiculite insulation and roof leaks, because those get handled before any sealing. You get a written plan that shows what needs fixing first, what we'll seal and what it'll cost.
Our installers seal in order
Our installers work through the plan in the order it's written, top of the house first. I check in while they're there, so you're never left wondering what's happening next.
We walk the job together
Before we pack up, I go over the finished work with you, including what we sealed and which vents we left open on purpose. That way you know exactly what's up there.
Why Gilroy homeowners call Thermal Gilroy Spray Foam Insulation for air sealing
The owner writes your plan
I come out myself to look at the house and write the estimate, and I'm the one who goes over the finished job with you. You're dealing with the person who planned the work from start to finish, so nothing gets lost along the way.
Working out of Gilroy since 2021
I started this business in Gilroy in 2021 after years of scheduling crews for a busy company and learning the trade beside the installers I booked. That's where my habit of doing things in the right order comes from, so a leak or a wiring problem gets fixed instead of buried.
Licensed and insured in California
We're licensed and insured, and I'm glad to go over both at the estimate before anyone goes up into your attic. You shouldn't have to take a crew's word for it.
On an air sealing job, the work only holds up when it's done in the right order. Tell us about your house and I'll set up a time to come take a look.
Request an estimateGet a free air sealing estimate for your Gilroy home
We reply within 1 business day, the on-site estimate is free and there's no pressure to book. I'll come out, look over your attic and gas appliances, and walk you through a written plan for sealing your house.
- 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 air sealing in Gilroy
How much does air sealing cost in Gilroy, CA?
The cost depends mostly on how much old insulation has to be moved to reach the leaks, how many openings run through your ceiling and whether anything needs fixing first. A clean attic that's easy to get around in costs less than one with soaked insulation to pull out or tight crawling room. Your own number comes from the written plan at the estimate.
Can I seal air leaks in my house myself?
Yes, you can handle the obvious leaks yourself, like gaps around door frames, pipes, vents, wires, ducts and fans. The small leaks hidden under attic insulation are harder, because finding them usually takes testing gear like an infrared camera, and that's where most people call a pro.
Is air sealing safe in a home with a gas furnace?
Yes, as long as the job starts by working out how much fresh air the house needs for healthy air and to vent the furnace, stove, oven and fireplace. An appliance that's short on oxygen can release carbon monoxide into your house, so tell us about every gas appliance you have before we start.
Should I seal air leaks before adding attic insulation?
Yes, sealing comes first, because that's how you get the most energy savings out of the new insulation. If you're planning both, book them together so the sealing is done before any new blown-in insulation, the loose fill blown through a hose, goes on top.
How do I know if air sealing actually worked?
Ask whether the crew runs a blower door test, a fan test that measures how much air the whole house leaks and can show the change after the work. Keep in mind that change can include more than the attic if other parts of the house were sealed too.
How long does air sealing take, and will we have to leave the house?
It depends on the size of your attic and how much old insulation sits on top of the leaks, and I'll tell you how long our crew expects to be there when I hand you the plan. Whether you, the kids or the pets need to step out depends on the materials in that plan, and I'll go over it with you before anything's scheduled.
Other work that goes with air sealing
Basement insulation
Worth a look if cold floors upstairs start with a chilly, leaky space below them.
Closed-cell foam insulation
A good fit when you want one dense layer that stops air and moisture where ducts or framing make sealing tricky.
Get your attic leaks found and sealed
Have a list of your gas appliances, anything you know about up there like a bath fan venting into the attic, and your insulation plans ready, so one visit covers it all.
Request an estimateCall (669) 205-6284