Attic air sealing in Gilroy CA - fewer drafts and an upstairs that holds its temperature
Hot upstairs or a climbing power bill? We seal the gaps between your attic and your rooms so the air stays in your rooms.
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Why does my upstairs feel drafty when the attic already has insulation?
Attic air sealing in Gilroy, CA closes the gaps between your attic and the rooms below, around lights, pipes, flues, the hatch and any open soffits, so the air you pay to heat and cool stops slipping into the attic. That usually means a lower power bill and less moisture building up in the attic, which protects the framing over time.
Most calls I get start with a room over the garage that won't cool down, cold floors in winter or a bill that keeps creeping up, so the first thing I do is ask a lot of questions about your house. The price mostly turns on how many openings your ceiling has, how much is stored up there and whether floorboards have to come up to reach them, and the schedule turns on whether anything has to be fixed before sealing starts. I sort all of that out when I come out, and you get a written plan with your price and the order of the work before anything is booked.
How we handle attic air sealing, step by step
A lot of attic sealing is just getting to the gaps, so it starts at the estimate, where I plan with you which stored boxes get moved, where they sit for a while and which floorboards come up. On the day, our installers clear the way, then seal around the flues, the recessed lights and the pipes and wires that come through the ceiling. We weatherstrip the attic hatch or pull-down stairs too, because that's an easy gap to miss. The roof vents, soffit vents and any combustion air ducts stay open on purpose, since the attic needs to breathe and your furnace needs its air.
Sealing is often the first half of a bigger job. Once the gaps are closed, retrofit insulation tops up what's already in an older attic, and sealing plus loose fill is usually where I'd point you. Spray foam insulation costs more because it seals air while it insulates, so I'd only steer you that way when your ductwork runs through the attic.
Attic air sealing in Gilroy and what we find up there
California lets someone without a contractor's license take on only minor jobs up to $1,000, and only when the work needs no permit and they have nobody working for them on it. That's worth checking with any crew you talk to about your attic, us included.
A lot of the attics I climb into around here belong to older houses that have been insulated more than once, so there's often a newer layer sitting on top of something older. I always check what's underneath before we seal, because fresh work over insulation that got soaked or filled with droppings just leaves the problem in place. We see the same layered attics on jobs in Morgan Hill and Hollister, and we handle them the same way.
- 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 attic air sealing in Gilroy?
Call or send a message
You call and I'll answer, or I'll get back to you. I'll ask how old the house is and what's stored in the attic, then we set a time for me to come look.
I look at your attic
I check the gaps, the vents, the old insulation and your furnace and water heater, and note anything that needs fixing first. You get a written plan with the price and the order of the work, so you know what it costs before you decide.
Our installers seal it in order
Our installers follow the plan, with any repairs and prep first and then the sealing. If something new turns up once the boards are up, I'll talk it through with you before anything changes.
We go over it together
Before we pack up, I walk you through what we sealed and what we left open on purpose. Your belongings go back where we planned at the estimate.
Why Gilroy homeowners call Thermal Gilroy Spray Foam Insulation for attic sealing
The owner writes your plan
I'm the one who comes out, looks at your attic and writes the plan, and I check in while our installers work. You've got one person to ask who has known your job since the first visit.
Licensed and insured for attic work
We're licensed and insured. That counts up in an attic, where the work runs close to wiring, flues and the ceiling over your rooms.
Jobs planned in the right order
I spent years scheduling crews before I started this business in Gilroy in 2021, and the biggest lesson was the order of the work. Safety checks and repairs come first, so the sealing doesn't hide a problem.
On this job the order matters most, and it starts with a look at your attic, so request your estimate or call (669) 205-6284.
Request an estimateGet a written attic air sealing plan for your house
We reply within one business day, and I'll set up a free on-site look at your attic, vents, old insulation, furnace and water heater. You'll get a written plan to keep, with no obligation to book.
- 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 attic air sealing in Gilroy
How much does attic air sealing cost in Gilroy?
There's no set price, because it depends on your attic, so I write you a price after I've seen it instead of guessing over the phone. Sealing on its own usually costs less than sealing plus new insulation, though doing both in one visit saves moving everything twice.
Can a program help pay for attic air sealing in Gilroy?
It might, because BayREN's EASE Home Program may cover much of the cost of eligible upgrades for low to middle income customers, and whole-home air sealing and attic insulation are among its common upgrades. Homeowners and renters in single-family homes who are PG&E customers can apply, so check with BayREN that your address is in its area and what the current terms are.
What causes a drafty upstairs when the attic already has insulation?
Usually it's air leaking through gaps in the ceiling around can lights, pipes, flues and the attic hatch, because insulation slows heat but doesn't stop air moving through it. Sealing those gaps is what lets the insulation do its job.
What is the best way to air seal an attic before adding insulation?
Seal first and insulate second, with safety settled before either one. Recommended practice handles the furnace and water heater and fresh air in the house first, then attic ventilation, and finishes the sealing before insulation goes in so you get the most out of it. We plan your job in that same order.
Is attic air sealing safe if I have a gas furnace and water heater?
Yes, when those appliances are checked first, because a tighter house can change the air pressure inside. Guidance makes sure furnaces and water heaters that send exhaust up the flue on their own draft still get enough air to burn, or switches them to power vent or direct vent models. I look at yours at the estimate so that step is part of the plan from the start.
What should I do if my attic has old wiring or vermiculite?
Tell us early, because old knob and tube wiring, vermiculite, mold or pests have to be repaired or dealt with before any sealing goes ahead. Vermiculite often looks like kitty litter, with some shiny granules in uneven shapes and sizes. A fix like that adds a step at the front of the job, so the schedule depends on what we find up there.
Other work that pairs with attic sealing
Retrofit insulation
Brings an older house up to date by adding insulation where it's thin, once the leaks are closed.
Spray foam insulation
Seals and insulates in one layer, which is worth the extra cost when your ducts run through the attic.
Book a look at your attic's air leaks
If you jot down what's stored in the attic, whether it has flooring and what kind of furnace and water heater you have before you call, email office@insulationgilroy.com or use the form, I can plan the visit around your house.
Request an estimateCall (669) 205-6284