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Serving Charleston, SC and surrounding areas. (843) 459-1691
Gaps in your attic, crawl space, and walls let Charleston humidity into your home all year. We find every leak with a blower door test and seal it so your cooling system finally has a fighting chance.
Gaps in your attic, crawl space, and walls let Charleston humidity into your home all year. We find every leak with a blower door test and seal it so your cooling system finally has a fighting chance.
Air sealing in Charleston means finding and closing the hidden gaps where humid outdoor air sneaks into your home, most jobs are completed in one to two days with a blower door test before and after, and the results appear on your energy bill within the first full cooling cycle.
Most air leaks are not where you would expect them. The biggest culprits are usually in the attic - around recessed lights, plumbing chases, and the gap where the top of your wall meets the attic floor. In the Lowcountry, a vented crawl space is often just as significant, pushing warm, moist air up through the floor into your living space all summer long. If you have already added basement insulation or attic insulation and still notice high humidity, unsealed gaps are almost certainly part of the problem.
Air sealing and insulation solve related but different problems. Insulation slows heat transfer, but it cannot stop air from moving through gaps - only sealing does that. Doing both together gives you the full benefit of each, and many homeowners who have had insulation added without sealing are surprised by how much of a difference addressing the gaps makes on its own.
If your cooling bills climb dramatically from May through September and your thermostat settings have not changed, your air conditioner is likely working overtime to fight humid outdoor air leaking in. Charleston summers are long and brutal, and a leaky home forces your system to run almost constantly. That pattern on your utility bill is one of the clearest signals that air sealing would make a real difference.
In the Lowcountry, a musty smell - especially near the floor or in closets - often means humid air is rising from a vented crawl space below. If you also notice hardwood floors cupping or swelling in summer, that is moisture coming up from underneath. Both are signs that your crawl space and floor assembly have significant air and moisture gaps that need to be addressed.
Hold your hand near an outlet or switch on an outside wall on a hot summer day. If you feel warm air coming through, that outlet is connected to a gap in your wall or attic that is letting outdoor air straight into your living space. This is a simple test anyone can do, and it is one of the most reliable signs that air sealing is overdue.
Homes built in Charleston before the mid-1980s were constructed under building practices that paid almost no attention to air tightness. If your home has never had a professional energy assessment - which includes a blower door test to measure how leaky the house is - there is a very high probability that significant gaps exist in your attic, crawl space, and wall penetrations.
Every air sealing project starts with a blower door test - a large fan mounted in a doorway that slightly pressurizes your home and makes air leaks easy to locate. We map out exactly where the gaps are before any sealing begins, so you know what is being fixed and why. The sealing itself uses spray foam, caulk, and weatherstripping applied to the attic floor, crawl space, rim joists, and any penetrations found during the test. We also pair air sealing with attic air sealing when the attic floor has multiple unsealed penetrations that need dedicated attention.
For homes with significant crawl space issues - which includes a large share of older Charleston properties - we combine air sealing with crawl space encapsulation to cut off the moisture pathway at its source. Once the sealing is complete, we run the blower door test again to measure the improvement and give you the before-and-after numbers in writing. This work is eligible for the federal tax credit currently available, and we provide the documentation you need to claim it. If you are also planning insulation upgrades, combining them with air sealing in a single project is more cost-effective than scheduling separately.
Suits homes where recessed lights, plumbing chases, or top-plate gaps are the primary source of air leakage into the living space.
Suits Charleston homes on crawl space foundations where vented spaces are pushing warm, moist Lowcountry air up through the floor year-round.
Suits older homes that have never had a professional energy assessment and likely have significant gaps throughout the attic, crawl space, and wall penetrations.
Suits homeowners who want to maximize comfort and energy savings by addressing both heat transfer and air movement in a single scheduled project.
Charleston sits in one of the most challenging climates in the country for homes - hot, humid summers where outdoor air is not just warm but loaded with moisture. When that humid air sneaks into your home through gaps and cracks, it raises your cooling costs and creates conditions where mold can grow inside your walls and attic. This is not a luxury upgrade here - it is one of the most practical improvements a Lowcountry homeowner can make. Many neighborhoods in the Charleston area, including the Peninsula, parts of West Ashley, and older sections of North Charleston, have significant housing stock built before the 1980s with large unsealed gaps in the attic floor, around plumbing penetrations, and along rim joists where the floor meets the foundation wall.
Homeowners we serve in Hanahan, SC and Goose Creek, SC often discover that their crawl space has been the primary driver of indoor humidity for years. Charleston's hurricane season also matters for scheduling - contractors get very busy with storm-related repairs from June through November. The best time to get air sealing done is late winter or early spring, so your home is fully prepared before the hottest and most humid months arrive. Waiting until July often means longer lead times and a home that spends another summer fighting itself.
Reach out by phone or form and we will respond within one business day. We ask a few quick questions - age of your home, whether you have a crawl space, and what problems you have been noticing - so we arrive prepared with the right diagnostic equipment.
Before any work begins, we set up a blower door test that pressurizes your home and makes air leaks easy to detect - sometimes you can feel the air moving with your hand. The assessment takes one to two hours and gives us a precise picture of where your home is losing conditioned air.
After the assessment, we walk you through exactly what we found and what we recommend sealing. You receive a written quote before any work is scheduled - no surprises and no pressure. We prioritize the areas that will make the biggest difference, not just list everything possible.
The crew works through your attic, crawl space, and other identified areas using foam, caulk, and other materials. Most jobs are done in one day. We run the blower door test again when finished and share the before-and-after numbers so you can see exactly what changed.
Free estimate. Blower door test included. We measure before and after so you can see the results.
(843) 459-1691We measure your home's air leakage at the start and again when we are done, then hand you both sets of numbers in writing. You get concrete proof that the work made a measurable difference - not just a contractor's word for it.
A large share of Charleston homes sit on crawl space foundations, and those spaces are a primary driver of indoor humidity in the Lowcountry. We assess the crawl space on every job because skipping it means leaving the biggest gap unaddressed.
We recommend late winter and early spring for air sealing because it puts your home in the best condition before Charleston's peak heat and humidity arrive. We also stay accessible before hurricane season fills contractor schedules across the region.
The federal Energy Efficient Home Improvement Credit currently covers 30% of air sealing costs. We provide the documentation you need to claim it at tax time. You can review the credit details at the IRS website - ask us for the paperwork and we will have it ready when the job is done.
Every detail above reflects how we actually run a job, from the diagnostic test on arrival to the verified results when we leave. Charleston homeowners who hire a contractor that measures and guarantees results get a home that performs better and a clear record of what was done.
Insulate your basement or lower-level foundation walls to complement the air sealing work done in the crawl space and attic.
Learn MoreDedicated attic-floor sealing for homes where recessed lights, plumbing chases, or top-plate gaps are the main source of air leakage.
Learn MoreCall now or request a free estimate online to get your air sealing scheduled before Charleston's peak cooling season and the summer contractor rush.