Attic air sealing in Santa Cruz CA - drafts stopped before new insulation goes on
Hot upstairs or drafty rooms often trace back to holes in the attic floor. We close them so your insulation can do its job.
Why is my house drafty even with insulation in the attic?
Attic air sealing in Santa Cruz, CA closes the holes in your attic floor around pipes, wires, lights and the hatch with sealant, spray foam or rigid blocking, so the air you pay to heat or cool stops slipping up into the attic.
Most people call us because the upstairs runs hot in summer, a bedroom feels drafty with the windows shut, or the power bill keeps creeping up, and in a lot of older houses that's air leaking through the ceiling more than thin insulation. The price mostly comes down to how many openings your attic floor has, how easy the attic is to move around in, how much old insulation has to be pulled back or hauled out, and what you decide about older can lights. The schedule turns on anything that has to be fixed before sealing starts, like a roof leak or a bath fan blowing into the attic, and on whether you're adding insulation right after. That's what the estimate is for, and it's where your own number comes from.
How we handle attic air sealing
We start by looking at what's already up there, and I'll tell you what I see before we touch anything. Our crew pulls back the old insulation and cleans off the attic floor so the sealant has something to stick to, then we go after the holes in that floor before new insulation gets a chance to cover them, around plumbing, wiring, the hatch and the tops of the walls. Big openings and open soffits get solid blocking, and hot flues get metal blocking and a metal collar instead of foam, because foam has no business sitting against a hot pipe. If you have older can lights, I bring them up early so you can decide on covers or new fixtures. Fire-rated covers will stop the leak, but one building guide says swapping them for new fixtures rated to sit in insulation and seal airtight is the better option, and that's a lot easier to settle before the crew is in your attic. We leave the eave, ridge and gable vents open, because they're there on purpose to let the attic breathe, and burying them is how moisture ends up in the framing.
Sealing is usually the first half of a bigger job. Once the holes are closed, most attics get topped up with blown-in insulation, which is loose fill blown through a hose, and in an older house that's often part of retrofit insulation, where we add insulation to a home that's already built. Spray foam insulation seals and insulates in one pass, but it costs more, so for most attics I'd rather seal the gaps and top up loose fill, unless your ductwork runs through the attic and foam starts to earn its price.
Why Santa Cruz homeowners call us to seal their attics
The owner does every estimate
I come out for every estimate myself, and our installers do the work with me checking in on the job. The person who looked at your attic floor and talked through your options is the same one keeping an eye on the sealing.
Licensed and fully insured in California
We're licensed and fully insured. The state licensing board gives insulation work its own license classification, and it only lets someone work without a license on small jobs capped at $1,000 that need no permit and where they have nobody working for them, so it's worth knowing who you're letting into your attic.
Older homes, explained before we start
Most of our calls come from owners of older homes around Santa Cruz, where the attic floor has usually picked up years of holes for wiring, pipes and lights. Since we started in 2023, I've made a point of walking you through what's up there before anyone picks up a tool, because new insulation laid over a problem just hides it.
Getting the order right is what makes this job work. Before you call (831) 201-6061 or send us a message, jot down what you know about old wiring, bath fans, roof leaks, gas appliances and can lights, since those decide what happens first.
Get your attic checked before it's sealed
We reply to every call and message within one business day. I'll set up a time to come out myself for a free on-site estimate, with no pressure and no obligation, and walk you through what your attic needs and in what order.
Attic air sealing, up close
What people ask about attic air sealing
What does attic air sealing do for my home in Santa Cruz?
It stops air from moving between your rooms and the attic, which saves energy, lowers your fuel bills and helps keep moisture problems out of the attic. Insulation slows heat, but air slips right past it through open holes, so sealing is what lets the insulation you have do its job.
What is the best way to air seal an attic before adding insulation?
Seal first and insulate second, because that order gets you the most energy savings. The usual order checks combustion safety and indoor ventilation first, then attic ventilation, then the sealing, with the insulation going on last. If new insulation is in your plans, book the sealing as the first step of the same project.
How do I know if my attic is ready for air sealing?
Your attic is ready once nothing up there needs fixing first, and the usual list is live knob and tube wiring, which is the old cloth wire on porcelain knobs, vermiculite insulation, bath fans venting into the attic and a leaking roof. An unvented kerosene heater or gas fireplace in the house also gets dealt with before sealing. None of that is unusual in an older house, so think of it as the first line of the plan, and I'll point out anything I spot at the estimate.
Does a gas water heater or furnace change attic air sealing?
It can, because one guide says homes with natural-draft appliances, the kind that vent by hot air rising up the flue, such as a furnace, boiler or water heater, need combustion safety testing by a certified energy rater. If you have one, plan for that test as part of the job, since sealing changes how air moves through the house.
How much does attic air sealing cost in Santa Cruz?
Your attic sets the price, so I can't give you a fair number until I've been up there. The choices that move it most are covers versus new fixtures for older can lights, whether old insulation has to come out first, and whether you do the sealing and new insulation as one job, which usually saves a second setup. Call (831) 201-6061 and I'll come out and price it.
Should I ask for a blower door test with attic air sealing?
It's a fair thing to ask, because one certification group's rules call for a blower door test, a big fan set in a doorway that measures how leaky the house is, before and after air sealing. Testing before and after shows how much the seal between your attic and your rooms improved, so ask any contractor you're talking to whether they test the house both times.
Work that often goes with air sealing
- Retrofit insulation
Adds insulation to a finished house, which is the natural next step once the attic floor is sealed.
- Spray foam insulation
Worth a look if your ductwork runs through the attic, since foam seals and insulates in the same pass.