Air sealing services in Hawthorne CA - leaks closed before insulation goes in
Drafty rooms or a hot room over the garage? We find the hidden gaps and seal them so your insulation can do its job.
- Service
- Air sealing services
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- (424) 307-8033
How do you know your house is leaking air?
Drafts at doors and outlets
You feel moving air around a door frame, behind an outlet cover or under the sink where the pipes come through the wall. That usually means a gap in the framing behind it, and as long as it stays open the house keeps pulling in outside air and dust, and the room never feels even.
A hot room upstairs
The room over the garage or the bedroom under the attic runs warmer than the rest of the house. Most of the time, attic air is slipping down around can lights, the attic hatch and wiring holes, and if you add insulation before those are sealed, the new insulation just fights a draft.
Gray lines along the carpet
Dark dust lines show up at the edges of the carpet, right where it meets the baseboard. Air is being pulled through a gap under the wall and the carpet is catching the dirt like a filter, so the lines get darker and the leak keeps feeding dust into the room until it's sealed.
What does air sealing a Hawthorne house actually involve?
D&J Hawthorne Insulation Services offers air sealing services in Hawthorne, CA, closing the gaps around door frames, pipes, vents and wiring, and between your attic and the rooms below. Sealing those leaks keeps attic and outside air out of your living space and helps head off moisture problems up in the attic.
Most people call us about a hot room, a drafty hallway or an attic they know is tired, and the leaks behind it are usually ones you can't see from inside the house. The price moves with how many gaps there are, how much old insulation is sitting on top of them, how easy the attic is to get around in, and whether something has to be fixed first, like a roof leak or soaked insulation that calls for insulation removal. The schedule turns on those same things, plus whether your job needs a permit and an inspection, and my written estimate puts the price and the plan for your house on paper.
Details to note before an estimate
- Age and rough size of the house
- Inches of insulation in the attic now
- Rooms that feel drafty or hot
- Water stains or old roof leaks
How we handle air sealing services
I start in the attic and work through the house, finding where air gets through around the hatch, can lights, pipes, wires and vents, and between the attic and the rooms below. Then I walk you through what I found and sort the leaks you can handle yourself, like a drafty door frame, from the hidden ones under the old insulation that are worth hiring out. Our crew seals those hidden gaps, keeps the eave vents along the roof edge clear so the attic can still breathe, and won't lay anything over insulation that's wet or full of droppings, because that only hides the problem. Once your house is tighter, I'll remind you to have a heating tech check your gas furnace, water heater and dryer, because a tighter house can let carbon monoxide build up when one of them isn't venting right, and the national sealing guides call for that check afterward.
Air sealing often leads into other work. If your house has a basement, the spot where the framing sits on the foundation leaks much like an attic does, and basement insulation can go in once those gaps are closed. Where the ductwork runs through the attic, closed-cell foam insulation, a dense foam that also blocks moisture, can be worth its higher price because it seals and insulates in one layer. Everywhere else, sealing the gaps and topping up the loose fill usually gets you more for the money, and I'll tell you which way your house leans.
Work that often goes with air sealing
Basement insulation
If your lower level feels clammy or chilly, insulating it finishes what the sealing starts down there.
Closed-cell foam insulation
When your ducts sit in a hot attic, dense spray foam closes the gaps and adds insulation in a single pass, at a higher cost.
What happens after you call us about air sealing in Hawthorne?
Call or send the form
Call (424) 307-8033 any day of the week, up to 11 PM, or fill out the form. We'll set a time for me to come out to your house.
I inspect and write it up
I come out myself, go up in the attic and check the walls or crawl space, and show you which leaks you can fix and which are worth hiring out. You get a written estimate with the price, the plan and anything that should be fixed first, so you know the cost before any work starts.
Our crew seals the leaks
The crew I trained covers your floors and belongings, then seals the leaks before any insulation goes in. If something like bad wiring turns up once we're in there, I stop and talk it through with you first.
We walk the job together
I check the crew's work, then walk the finished job with you so you can see where we sealed and ask anything you want. Satisfaction guaranteed.
What people ask about air sealing
How much does attic air sealing cost in the Los Angeles area?
Attic air sealing by a professional insulator in the Los Angeles area usually costs about $350 to $2,350 per job. That's the going rate around here, not a quote from us, and where your house lands depends on how many gaps there are, how deep the old insulation is and how easy the attic is to work in. I'll give you your own number in writing after I've seen the space.
Is there a program that pays for air sealing in Hawthorne?
Some Hawthorne owners may be able to get it covered. Los Angeles County's Equitable Building Decarbonization program covers insulation and air sealing for people in the program, and the county has said Hawthorne is among the first communities it will focus on. The state's Energy Savings Assistance program also offers no-cost weatherstripping, caulking and air leak repairs to households that meet the CARE or FERA income limits.
How do I know which air leaks I can seal myself?
The obvious ones around door frames and where pipes and vents come through the walls are usually fine to caulk or weatherstrip yourself. The small, hard-to-find leaks are a different story, especially in an older attic where layers of insulation sit right on top of them, so that's the part most owners hire out. The federal guide says professionals find those with a blower door test, which pulls air through the house, and a thermal camera that shows where it's sneaking in.
What is the best way to air seal an attic before adding insulation?
Seal every opening in the attic floor first, then add the insulation. Loose fill and batts slow heat but let air pass, so if the gaps stay open, air keeps running right through the new layer. If you're also planning attic insulation, we put both on one estimate with the sealing first.
When is HERS testing required for air sealing in California?
HERS testing, an independent check of the finished work, gets triggered through a properly permitted job, and it may be mandatory depending on the work you're having done. The California Energy Commission says a contractor should be able to explain both the permit and the testing, so ask. When your job needs a permit, we pull it and set up the inspections with the city or county office that handles your address.
What license should an insulation contractor have in California?
Look for the C-2 insulation and acoustical class, which the state licensing board sets for contractors who install insulating materials for temperature or sound control. Air sealing usually goes hand in hand with that work, so it's worth asking any contractor which license they hold. We're fully licensed and insured, and no question about it is too small to ask me at the estimate.
Get a written air sealing plan for your house
We respond within 1 business day to set a time that works for you. The estimate is free and in person, and there's no pressure to book. Once you send the form, I come out, look at the space myself and give you the price and the plan in writing.
Explore our services and areas
Services
- Spray foam insulation
- Attic insulation
- Blown-in insulation
- Home insulation
- Insulation removal
- Crawl space insulation
- Wall insulation
- Basement insulation
- Closed-cell foam insulation
- Open-cell foam insulation
- Commercial insulation
- Crawl space vapor barrier
- Vapor barrier installation
- Attic air sealing
- Retrofit insulation
Get your hidden air leaks found
Before I come out, jot down your gas appliances, any plan for new attic insulation and whether the insulation up there looks dirty, because dirty insulation usually means air is moving through it.