Blown-in insulation in Gilroy, CA - an attic covered evenly, edge to edge
Hot upstairs or a cold room over the garage? We seal the gaps first, then blow in an even layer across the whole attic.
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Is blown-in insulation the right fix for my Gilroy attic?
Blown-in insulation is loose fill, usually cellulose or fiberglass, that we blow through a hose onto the floor of a vented attic. In Gilroy it's one of the usual ways to top up an older home that has little or no insulation up there, so the rooms below stop running so hot or so cold.
Maybe the upstairs bedrooms bake by late afternoon, the room over the garage never warms up, or you just bought an older place and have no idea what's in the attic. The price mostly comes down to how big the attic is, how many inches are already up there, how much sealing it needs and whether old material has to come out first. The schedule turns on anything that has to be fixed before we insulate, like a roof leak, old wiring or pest damage, because those always come first. I'll ask you a lot of questions about the house when I come out, and the written plan you get afterward spells out the order of work and the price for your attic.
How we install blown-in insulation, step by step
Here's the order we work in. First I go through the attic and list what has to be fixed before anything goes on top, because insulation laid over a leak or an old wiring problem just hides it. Then our installers seal the gaps around can lights, pipes, wires and the attic hatch as a separate step, since blown insulation slows heat but won't stop a draft. Next they set baffles, which are short channels at the eaves that keep the vents open, so the new fill can't spill into the eaves and the attic keeps breathing. Last, they blow in the new layer evenly across the whole ceiling, right out to the edges over the outside walls, because a deep middle with thin edges is the most common way this job goes wrong.
Sometimes the attic is only part of the story. If the floors stay cold or the room over the garage still won't settle down, our home insulation work looks at the whole house. And if the old layer is soaked or full of droppings, we do insulation removal first, because fresh fill over a bad layer keeps the problem right where it is. Your plan says plainly whether the old insulation comes out or just gets moved aside while we seal.
Blown-in insulation in Gilroy and the California attic rule
California's energy code covers insulation added to the attic of an existing low-rise home, and it counts what's already up there plus what we add, so the total has to reach the state's level for single-family homes. That's why I measure what's in your attic at the estimate instead of guessing. When a contractor installs the insulation, the state has that contractor certify to you in writing that it meets those requirements, so you end up with proof on paper that the finished attic meets state code. If your job also needs a permit, we pull it and set up the inspection with the city or county office, and we'll talk that through when I come out.
Around Gilroy we open a lot of older attics where the insulation is thin, packed down or missing at the edges, and the room over the garage is often the one people complain about first. We see the same thing on jobs in San Martin and Morgan Hill, and we work north into Santa Clara County and south toward Hollister, Salinas and Watsonville.
- 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 blown-in insulation in Gilroy?
Call or send the form
You call (669) 205-6284 and I answer, or I call you back, and we set a time for me to come see the attic. I'll ask how old the house is and which rooms bother you most.
I look and write a plan
I go up into the attic, check what's there and note anything that has to be fixed first, then walk you through a written plan. You see the order of work and the price before anything is booked.
Our installers work in order
Repairs on the plan come first, then sealing, then the new layer, so nothing gets buried that should have been fixed. I check in while they're working so you know what's coming next.
We walk the finished attic
Before we pack up, I go over the finished job with you. You'll see the depth across the whole attic and the vents at the edges still clear.
Why Gilroy homeowners call Thermal Gilroy Spray Foam Insulation for blown-in insulation
The owner writes your plan
I come out myself to look at the attic and write the estimate, then check in while our installers work and go over the finished job with you. You deal with the same person from the first look to the last walk-through, and the work is backed by our satisfaction guarantee.
Running jobs in order since 2021
Before I started this business in Gilroy in 2021, I spent years scheduling crews for a busy company and learned insulation working beside the installers on the jobs I booked. That's why I'm careful about keeping a job moving in the right order, and why I tell you what's next instead of leaving you guessing.
Licensed and insured in California
We're licensed and insured, and California's state licensing board has a classification for contractors who install insulation. It's fair to ask anyone bidding on your attic how they're licensed, and we're happy to answer.
On this job the order matters most, with fixes and sealing done before the fill goes down. Send us a few details about your attic or call (669) 205-6284, and I'll come take a look.
Request an estimateGet a written plan for blown-in insulation in your attic
I'll reply within one business day and set a time to come out for a free on-site look at your attic. You'll get a written plan that lists anything that needs fixing first and the price, with no pressure 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 blown-in insulation in Gilroy
How do I know if my older Gilroy home needs blown-in attic insulation?
If your house is older and you can see the tops of the ceiling joists in the attic, it probably needs more, because many older homes have little or no attic insulation. Blown-in loose fill suits the floor of a vented attic, the kind with vents at the eaves or the roof. I measure how many inches are up there now at the estimate, since that tells us how much to add.
How much does blown-in attic insulation cost in Gilroy?
Attic insulation in the San Jose area usually costs about $1,800 to $6,000 per job, and that's the going range for the area, not a quote from us. Where your attic lands depends on its size, what's already up there and how much sealing and repair comes first, and your written plan gives you your own number.
How much can blown-in insulation save on my power bill?
On average, adding insulation and sealing air leaks can save up to 15% on heating and cooling. That figure counts insulation in attics, floors, crawl spaces and basement rim joists together with air sealing, so an attic job by itself is one part of it, and we won't promise a number on your bill.
What gets checked in my attic before blown-in insulation goes in?
The attic should be checked for water leaks, moisture, structural damage and pests, and you get a list of needed repairs before any work starts. Active knob and tube wiring, the old kind strung on porcelain knobs, has to be replaced or properly boxed first, and work stops if the old insulation is vermiculite, a pebbly fill that may contain asbestos. If you have gas equipment that vents by natural draft, it gets a combustion safety test so exhaust doesn't spill back into the house, and can lights that aren't rated for contact with insulation get boxed in with drywall or rigid foam and sealed at the seams.
Does blown-in insulation stop drafts in my attic?
No, blown-in insulation slows heat but it isn't an air barrier, so it won't stop drafts by itself. That's why sealing is its own step in our plan, and it's a good question to ask every contractor bidding on your attic.
What is the best way to insulate my attic, blown-in or spray foam?
For most vented attics, sealing the gaps and topping up with blown-in insulation is the better buy. Foam costs more but seals air while it insulates, so it mostly earns its price when your ductwork runs through the attic, and I'll tell you at the estimate which way I'd go for your house.
Other work that pairs with attic insulation
Home insulation
When the attic is done but the floors still run cold, a whole-house look finds where the rest of the heat is slipping out.
Insulation removal
Clearing out a wet or droppings-filled layer gives the new insulation a clean, dry start.
Book a look at your attic insulation
When you call (669) 205-6284 or send the form, tell me how old the house is and whether you've got can lights, old knob and tube wiring or a gas water heater or furnace, so I come out ready to check them.
Request an estimateCall (669) 205-6284