Attic air sealing in North Charleston SC - a ceiling that stops leaking attic air

Hot upstairs, drafty rooms and a power bill that keeps climbing? We close the ceiling gaps so attic air stays in the attic.

Request an estimate (843) 278-0240

Attic roof slopes lined with reflective insulation above a layer of loose white blown-in insulation.

Does my attic need air sealing, or just more insulation?

Attic air sealing closes the holes and joints in the ceiling between your attic and your rooms, so in a North Charleston house the air you pay to cool stays downstairs and the attic air stays up there.

Most calls start with an upstairs room that won't cool down, or a ceiling where you can feel air around the light fixtures and the attic hatch. The insulation usually isn't the whole problem, because air slips through gaps around pipes, wires, flues and can lights and carries heat right past it. What moves the price is how many of those gaps there are, how easy the attic is to get around in, and whether something up there has to be repaired before we can seal. Those repairs set the schedule too, since sealing only starts once they're done, and if new attic insulation is on your list, we plan the two together. My estimate lays out each step in order, so you'll see your own job broken down before anyone goes up the ladder.

How we handle attic air sealing, step by step

Before we seal anything, we go through the whole attic looking for roof leaks, old wiring and bath fans venting into the attic, because those have to be repaired first or the sealing just closes the problem in. Then our crew works across the attic floor, sealing around pipes, wires, flues, light fixtures and the hatch with material matched to the size of each gap and the heat around it. We keep the soffit and ridge vents clear the whole way, so the attic still moves air the way it should. The last pass is along the eaves, where gaps are easy to miss and insulation tends to end up thin.

Sealing is usually one piece of a bigger plan. In older houses it often goes with retrofit insulation, adding insulation to a house that's already built, and we seal first so the new layer isn't fighting a draft. Where the ductwork runs through the attic, spray foam insulation at the roofline can be worth the extra cost, since foam seals air while it insulates. For most attics, though, sealing the gaps and topping up blown-in insulation, loose fill blown in through a hose, does the job for less.

Sealing now, insulation later

This suits an attic where the insulation already up there is dry, clean and fairly even, or where you'd rather spread the work out. We seal now so whatever goes on later isn't fighting a draft, and I'll tell you if the top-up can wait.

Sealing right before new insulation

This suits an attic with thin or patchy insulation, the kind that's deep in the middle and bare at the edges. We seal the ceiling first and add insulation as the next step, with any soaked or dirty material taken out before anything new goes down.

Why North Charleston homeowners call us for attic air sealing

I inspect your attic and write the estimate

I come out to every job myself, go up into the attic and write the estimate, so the person pricing your job is the one who's seen it. Our installers then do the work with me or a lead installer on site, keeping to the order on that estimate.

An HVAC tech's eye on your attic

I spent years as an HVAC service tech before starting this business in 2023. Working around attic equipment taught me to look at the ducts, flues and bath fans along with the insulation, because the biggest leaks I found were usually right around them.

Licensed and fully insured on every job

We're licensed and fully insured, which matters on a job where our crew is working above your ceiling, around flues and next to your wiring. If you'd like to see proof of that before we start, just ask when I come out for the estimate.

We'll tell you if the job can wait

If your attic doesn't need sealing yet, or a roof leak has to be fixed first, I'll say so instead of selling you work your house won't use. Satisfaction guaranteed. Call (843) 278-0240 or send the form to set up a visit.

Get a step-by-step estimate to seal your attic

We reply to every call and form within one business day to set a time for me to come out. I look over the attic and write your estimate on site, free and with no obligation to go ahead. It helps to have a few notes ready on how you get into the attic, what's stored up there and any roof leak or bath fan venting into it.

Phone: (843) 278-0240
Email: sales@northcharlestoninsulation.com
Location: North Charleston, SC 29418
Hours: Mon–Sun: 8 AM–9 PM

Attic air sealing permits and houses in North Charleston

Inside the city, the North Charleston Building Department issues building permits and inspects renovations and residential projects, and altering a structure without the permits it needs is a misdemeanor. Whether sealing your attic needs a permit isn't something I'll guess at, so we find out which office covers your address, check what it asks for and take care of any permit your job needs before we start. At the state level, a contractor a homeowner hires for specialty trade work on a job over $500 counts as a residential specialty contractor, and that registration goes through the South Carolina Residential Builders Commission.

We're based in North Charleston and do the same work across the cities around it, including Hanahan and Goose Creek. A lot of what we see here is older houses where years of rewiring, plumbing changes and new light fixtures left holes in the ceiling nobody went back to close, often with ductwork and bath fans sharing the same attic. If your city isn't on our list, call and ask.

Questions North Charleston homeowners ask about attic air sealing

What causes drafts and a hot upstairs when my attic already has insulation?

Usually it's air moving through gaps in the ceiling, because insulation slows heat but doesn't stop air from passing through it. Sealing those joints and holes with sealant, solid blocking and covers saves energy, lowers your power bill and helps keep moisture problems out of the attic.

Should attic air sealing be done before adding new insulation?

Yes. A federal attic sealing guide deals with combustion safety and indoor ventilation first, then attic ventilation, and finishes the sealing before insulating to get the most energy savings out of the job. If new insulation is in your plans, book the sealing as the step right before it so nobody has to pull insulation back up later.

Will air sealing my attic close off the vents?

It shouldn't. Soffit, ridge and gable vents and combustion air ducts are openings left there on purpose, and they only work if air can move through them. Ask any installer how they'll keep those clear, and I'll show you where that's covered on our estimate.

How much does attic air sealing cost in North Charleston?

Attic insulation jobs in the Charleston area usually cost about $1,500 to $4,500 per job, which is the nearest local range for attic work, not a price for sealing alone. Your sealing price turns on the gaps, the access and any repairs that come first, so an estimate is the way to get a real figure for your attic.

How do I get my attic ready for air sealing?

Start with what's stored up there, because a crowded attic may mean planning to move those things and keep them somewhere else while we work. Flooring or plywood over the attic floor has to come up before sealing, and if it's doing a structural job, that job gets replaced first, for example with collar ties, the boards that brace the rafters.

Do recessed can lights need covers when you seal an attic?

Yes, if they aren't ICAT-rated, the rating for lights built to sit against insulation and hold back air. Those get covers installed over them, and hot flues get metal blocking and collars instead of foam. If you don't know which kind of can lights you have, ask, and I'll check them when I'm up there.