Attic air sealing in Los Banos CA - rooms that stop pulling in attic heat and dust
If some rooms run hot, dusty or drafty, we close the gaps in your attic floor so the air you pay to cool stays put.
- Licensed and insured.
- Free quotes on site.
- Replies within 1 business day.
What does attic air sealing do for a Los Banos home?
Attic air sealing in Los Banos closes the holes in your attic floor around wires, pipes, light fixtures and flues with caulk, spray foam or rigid blocking, so hot attic air and dust stop leaking into the rooms below. In a vented attic it's the first step, done before any new insulation goes in.
Most calls I get start with a room that won't stay comfortable or an attic nobody has looked at in years, and sealing is usually where the fix begins. The price comes down to how many gaps there are, how easy they are to reach and whether old material needs insulation removal first, and the schedule mostly turns on anything that has to be repaired before we seal. I'll look it over and write it up line by line on the estimate, so you can see what your house needs and what it doesn't.
How can you tell your attic is leaking air?
Rooms that won't stay comfortable
One room bakes while the next one is fine, or you feel a draft in the hall and the AC runs all afternoon. That usually means air is moving through gaps between your rooms and the attic, and every summer you wait, the power bill pays for cooled air that leaks away.
Dust under the attic
A film of dust keeps coming back in the rooms right under the attic, sometimes as a gray smudge around a ceiling light or vent. That's often attic air being pulled down through the gaps, and it keeps bringing dirt and old insulation fibers with it until the holes are closed.
Dry air all winter
If the house feels dry and staticky every winter, warm air is likely escaping up through the ceiling while dry outside air gets drawn in to replace it. Left alone, you're paying to heat air that goes straight into the attic.
How we handle attic air sealing
We start by finding the gaps, which usually means pulling back old insulation over the tops of your walls, around light fixtures and at the hatch, because that's where air slips through. Then we seal the holes in the attic floor around wires, pipes, lights and flues, using the right material for the size of each gap, before any insulation covers them up. Around a hot flue we use metal, not foam, because foam has no business sitting against that heat. The hatch gets sealed too, and only then does insulation go back down, even across the ceiling and right out to the edges.
Sealing is usually the first half of a bigger attic job. In an older house it often leads straight into retrofit insulation, adding insulation to a house that's already built and lived in, and if your ducts run through the attic, we'll talk about spray foam insulation instead of loose fill.
Seal and top up loose fill
This suits most vented attics where the ducts don't run through, because the sealing does the heavy lifting and blown-in insulation, loose fill blown through a hose, costs less than foam. It's what I recommend most of the time.
Spray foam when ducts are up there
Foam costs more, but it seals air and insulates in the same coat. When your ductwork lives in a hot attic, that's when the extra cost makes sense, because the ducts end up inside the sealed space instead of baking in the heat.
Get a written estimate for sealing your attic
We reply within one business day to set a time for me to come out. The estimate is free and done at your house, with no pressure to book. I look over the attic in person and write the job up line by line.
(209) 270-5807Attic air sealing in the Los Banos heat
Los Banos sits in a warm, dry climate zone, the same one as the rest of Merced County, and California's Energy Code also splits the state into climate zones and ties some efficiency standards, like those for walls, roofs, windows and doors, to the zone a house sits in. In an attic here that mostly means summer heat, so the gaps that matter most are the ones letting hot attic air and dust down into the rooms you're trying to keep cool, and that's why we seal before we add anything on top.
A lot of the attics we open around here haven't been touched in years, with old insulation packed flat and ducts running across the ceiling. We see the same kinds of attics on jobs in Dos Palos and Newman, and we handle them the same way, fixing what's wrong first and sealing before anything gets covered.
What happens after you call about attic air sealing in Los Banos?
Call or send the form
You call (209) 270-5807 or send the form, and we set a time for me to come out. Let us know where the attic hatch is, closet or garage, so I know where to go.
I look over the attic
I go up and check the gaps, the old insulation, the vents and the wiring, and note anything that needs fixing first. You get a written estimate with each part of the job on its own line, so you can see what has to be done now and what can wait.
We fix, seal, then insulate
If you go ahead and the job needs a permit, we take care of it and tell you before we start. Our crew does the repairs and prep first, seals the gaps in the attic floor, and only then puts insulation down.
Walk the finished job together
I walk the finished attic with you so you can see what was sealed and where. We leave your house the way we found it, just with the work done.
Frequently asked questions
How much does attic air sealing cost in Los Banos?
The cost depends on what's up in your attic, so I give you a number after I've been up there. The biggest things that move it are how many gaps there are, whether old insulation has to come out before we can reach them, and whether you top up with loose fill or go with spray foam, which costs more. The estimate lists each of those on its own line.
What has to be fixed before attic air sealing starts?
Wet insulation, moldy or rotted rafters and an attic with little or no ventilation should all get a professional fix before sealing. The same goes for kitchen, bathroom or dryer vents that blow into the attic, and for knob and tube wiring, the old cloth-covered wiring strung on porcelain knobs. Sealing and insulating over any of them just hides the problem, so if I find one, it goes on the estimate as its own item.
Is attic air sealing safe if I have a gas furnace or water heater?
It can be, but in some cases sealing can cause a gas or oil appliance that vents by natural draft, with no fan pushing the exhaust up the flue, to pull combustion gases back into the house. If you have one, consider having a Home Performance Contractor test it before and after the sealing.
Which attic vents should stay open after air sealing?
Soffit vents under the eaves, ridge and gable vents, and any duct that brings combustion air to a furnace or water heater all have to stay open, because they only work with air moving through them. Sealing closes the holes into your living space, not the attic's own vents. When insulation goes back in, we keep it clear of the eave vents, since a buried vent stops the attic from breathing and moisture can show up in the framing.
How do I handle vermiculite insulation before attic air sealing?
Leave it alone until an approved lab has tested it for asbestos, and your local health department can give you the name of an approved lab. Vermiculite is loose, pebbly fill, usually gray-brown or gold, so if your attic floor looks like that, mention it before anyone goes up there. We don't disturb it until it's been tested.
How long does attic air sealing take on a Los Banos house?
It turns mostly on how much has to happen before the sealing and how easy the gaps are to reach. A low attic with deep old insulation over the ceiling takes longer than an open one, and a repair or a fan that needs rerouting comes first. After I've been up there, the estimate lays out each part of the job in order, so you know what to plan around.
Los Banos, CA
Have your attic gaps found and sealed
When you call or send the form, tell us about any gas or oil appliances and any wet or pebbly old insulation you've seen up there, so I know what to look for.