Attic air sealing in Lawndale CA - gaps closed before the insulation goes in
Hot rooms upstairs or dirty attic insulation usually mean your ceiling leaks air. We seal those gaps so the insulation can do its job.
- Fully licensed and insured.
- Free estimates at your property.
- We respond within 1 business day.
Why does my house feel drafty even with insulation in the attic?
Attic air sealing in Lawndale closes the gaps between your rooms and the attic, around lights, ducts, wiring, pipes and flues, before any new insulation goes in, so the air you pay to heat or cool stays in your rooms and attic dust stays out.
Most people call because the upstairs runs hot, the power bill keeps climbing, or someone told them to just pile on more attic insulation. The price mostly turns on how big your attic is, how easy it is to move around in, how many openings the ceiling has, and whether old insulation, wiring or a gas appliance needs attention first. Those same things set the schedule, along with any permit the job needs. The written estimate after my visit lists each step in order, so you see your own number and what it covers before anything starts.
How can you tell your attic is leaking air?
Dirty streaks in the insulation
Gray or black streaks in the insulation mean air has been moving through it and leaving dust behind, the way a furnace filter does. There's usually a gap right underneath, and the longer it runs, the dirtier the insulation gets and the less it does for you.
A room that runs hot
When the upstairs or the room over the garage never feels like the rest of the house, attic air is usually getting in around lights, vents and the hatch. Left alone, it shows up on the power bill every month.
Drafts at lights and the hatch
A draft around a can light or the attic hatch, or a dusty ring on the ceiling around a vent, marks an open path to the attic. If new insulation goes over those spots before they're sealed, it spends its life fighting the draft.
How we do attic air sealing
I go up first and find every place air moves, around can lights, the hatch, duct openings, wires and pipes, and the chases where they drop into the walls. Small gaps get caulk or spray foam, and bigger openings get a rigid piece cut to fit and sealed at the edges, so the attic floor is one tight surface before any insulation touches it. Around furnace and water heater flues we use materials made for the heat. We keep the eave vents clear so the attic still breathes, and when insulation goes back on top, it goes full depth right out to the edges, not just heaped in the middle.
Sealing is usually only half the job. Once the floor is tight, retrofit insulation adds to what's already up there without opening a ceiling, and when the ductwork runs through the attic, spray foam insulation under the roof can seal and insulate in one pass.
Seal, then top up with loose fill
This suits most attics where the insulation is dry and clean, because we seal the floor and then add blown-in insulation, loose fill blown through a hose, over it. It's what I usually recommend, since it fixes the leaks for less than foam.
Foam at the roofline
Foam costs more, but it seals air while it insulates, so it's worth it when the ducts or the furnace live up in the attic. It brings that equipment inside the sealed space instead of leaving it out in the heat.
Clear out old insulation first
If what's up there is soaked, matted or full of droppings, sealing under it and adding more just buries the problem. In that case insulation removal comes first, then the sealing, then fresh insulation.
Get a written plan for sealing your attic
We reply within one business day to set up a free estimate at your house. I come out myself to look at the attic, and there's no pressure to book once you've read the plan.
(424) 528-1317- Based in
- Lawndale, CA 90260
- Hours
- Mon–Fri: 7 AM–9 PM, Sat–Sun: 6 AM–9 PM
What happens after you call about attic air sealing in Lawndale?
Here's how a job runs from your first call to the walk-through, and what you'll have in hand before you decide anything.
Call or send the form
Tell us what you're noticing and whether you have a gas furnace or water heater, and we'll set a time for me to come out. If you've looked through the hatch, tell us roughly what insulation is up there now.
I measure and check the attic
I come out myself, measure the attic and look at every opening in the ceiling. I also note anything that has to be dealt with first, like old wiring, damp spots or insulation that looks like vermiculite.
Read the written estimate
You get a written estimate that lists each step in order, so you can see what the job involves and what drives the cost before you say yes. If something has to be fixed before sealing, it's on there as its own step.
We do the work, then walk through
If you go ahead, we sort out any permit, our crew does the work with me on site, and we walk through the finished attic with you. Lawndale allows construction work weekdays from 7 a.m. to 7 p.m. and Saturdays from 8 a.m. to 5 p.m., with none on Sundays or city holidays, so we book your work inside those hours.
Why Lawndale homeowners call Evergreen for attic sealing
The person who quotes is there
I come out myself to look, measure and write the estimate, and I'm on site while our crew does the install. The person who found the leaks is the one checking that they're closed.
Back in the trade since 2023
I learned this work crawling attics, spent years doing other things, and started this business in Lawndale in 2023. Coming back meant reading the current guidance closely, so the order we work in follows that and not old habits.
Fully licensed and insured
We're fully licensed and insured. That matters in an attic, where the crew works around wiring, gas flues and a ceiling you'd rather nobody stepped through.
We'll say when it isn't ready
If there's a damp spot, old wiring or a problem with a gas appliance, I'll tell you it needs fixing before we seal, because doing the job out of order means doing it twice. Satisfaction guaranteed on every job.
If you're not sure your attic is ready for sealing, that's what the first visit is for. Use our contact page or call (424) 528-1317 and I'll come take a look.
Attic sealing, permits and older houses in Lawndale
The City of Lawndale lists a building permit for installing, repairing or replacing insulation, but that list names insulation and not air sealing, so it doesn't settle whether a sealing-only job needs one. When your job adds insulation after the sealing, the insulation permit applies. Before work starts we check with the city or county office that covers your address, and when a permit is needed we take care of the paperwork and the inspection. If you'd rather ask the city yourself, it takes permit questions at (310) 973-3230.
Around here we mostly work in older houses with can lights cut into the ceiling, a hatch in a hallway or closet, and a furnace or water heater flue running up through the attic, and those are exactly where the air gets through. We find the same layout on jobs in Torrance and Hawthorne, so the gas appliance and wiring checks come first there too.
Questions about attic air sealing in Lawndale
Is adding more insulation enough to stop drafts from the attic?
No, because fluffy insulation like fiberglass slows heat but lets air pass right through it. Piling more on leaves every gap underneath open, which is why the sealing gets done first, while the attic floor is still easy to reach.
Will my gas water heater or furnace be checked before attic air sealing?
Yes, if your house has gas appliances that vent fumes up a flue, they get a safety check before any sealing to make sure fumes aren't spilling back into the house. If the check turns up a problem, it gets fixed before we seal, so plan for that step in case it's needed.
How much does attic air sealing cost near Lawndale?
In the Los Angeles area, blown-in fiberglass attic insulation with air sealing at obvious gaps usually costs about $1,200 to $1,500 per job. That's the going rate for that combination, not our quote, and a sealing-only job or one with old insulation to clear out will land differently. Your own figure comes from the written estimate after I've seen your attic.
Who is allowed to do attic air sealing work in California?
California's state licensing board licenses insulation contractors as the trade that installs any insulating material for temperature or sound control. Someone without a license can only take small jobs up to $1,000, and only when the work needs no permit and they have nobody working for them on it.
What is the best way to handle old wiring or vermiculite in my attic?
Deal with it before any insulation goes in. Live knob and tube wiring, the old kind strung on porcelain knobs, has to be replaced or properly boxed in first, and insulation that looks like vermiculite, a gray-brown pebbly fill, may contain asbestos, so work stops until it's handled.
How do I compare bids for attic air sealing?
Ask each contractor how they'll find the leaks, since some use an infrared camera, some feel for moving air and some read the dirt in the insulation. Energy guidance also calls for a blower door test, a fan that measures how airtight the house is, before the work, and you can ask for the target number from it at the start.
Related services that pair with attic sealing
Retrofit insulation
If the insulation left after sealing is thin or settled, adding to it brings the ceiling up to depth without tearing out what's still good.
Spray foam insulation
When ducts or a furnace sit in the attic, foam sprayed under the roof seals and insulates at once and keeps that equipment inside the tight space.
Service areas for attic air sealing
Evergreen Lawndale Spray Foam Insulation is based in Lawndale, California, and we seal attics across the South Bay. The 12 cities below each have their own page, including Gardena and Redondo Beach, and we work in the cities around them too.
Lawndale, CA
Get your attic sealed before it's insulated
Every month the gaps stay open, more attic dust gets pulled into the insulation and more of the air you paid to cool slips out through the ceiling.