Crawl Space Encapsulation in Coastal Georgia & Northeast Florida
Seal the space below and the whole house gets drier
Heavy vapor barrier, sealed vents, drainage and dehumidification that keep the space dry, clean and conditioned year-round.
On the Georgia and Florida coast, a vented crawl space is a moisture pump. Encapsulation seals the space off from wet ground and humid outside air - a heavy vapor barrier on the floor and walls, sealed vents, drainage where it's needed, and a dehumidifier that keeps it dry and conditioned all year.
A vented crawl space breathes coastal air
Warm, wet air pours through the vents and condenses on cooler framing and ductwork. Add a shallow water table and sandy soil that drains straight to it, and the space stays damp for months. That's where wood rot, mold odor, pests and rusted duct straps come from - and up to half the air you breathe upstairs started down there.
Seal it, drain it, dry it
We clear the space, correct standing water with interior drainage, then seal the floor and walls with a heavy reinforced vapor barrier, close and insulate the vents, seal penetrations, and set a properly sized dehumidifier with a condensate line. Rotted supports get replaced before anything gets sealed.
A dry, clean, usable space
The musty smell goes away. Relative humidity under the house holds in a controlled range instead of tracking the weather. Floors feel firmer, HVAC works less, and the crawl space becomes storage instead of a place you dread. It's also a documented improvement when you sell.
What’s included
A full encapsulation - not a plastic sheet
Every scope is written out line by line before we start. A typical coastal encapsulation includes:
- Debris and old, failed vapor barrier removal
- Rotted post, girder and joist repair where needed
- Interior drainage and sump where water collects
- Heavy reinforced liner on the floor, sealed up the walls and piers
- Vents sealed and insulated; rim and penetrations air-sealed
- Properly sized dehumidifier with drain line and humidistat
- Photo documentation before, during and after
What we won’t do
We won't lay plastic over wet dirt and call it encapsulation, we won't seal a space with active water, and we won't sell you a dehumidifier as a substitute for fixing drainage. If a smaller repair solves your problem, that's what goes in the quote.
What to expect
Four steps, start to finish
Free inspection
We go under the house, take moisture and humidity readings, check framing and supports, and photograph everything.
Written plan & price
You get an itemized scope and a fixed price, plus financing options - and time to think it over.
Install, 1–3 days
Our own crew handles repairs, drainage, liner, air sealing and the dehumidifier - and cleans up behind itself.
Walkthrough & warranty
We walk you through the after photos, set the humidistat, and hand over your warranty in writing.
Encapsulation FAQs
The questions we get on every inspection
How much does crawl space encapsulation cost in coastal Georgia and northeast Florida?
Most projects run $5,000–$15,000, roughly $3–$10 per square foot of crawl space, and cost guides that publish Georgia and Florida figures land on about the same $5,500 average as the national one. Square footage, drainage or a sump where water collects, hauling out debris and old plastic, rot repairs found along the way and the dehumidifier ($800–$2,000 installed) move the number. You get one fixed written price after the free inspection.
Can you encapsulate a crawl space in a flood zone?
Yes, with one rule that matters on the islands. Under federal floodplain rules, a home in a FEMA flood zone that was built or substantially improved under those rules needs flood openings in the walls of the enclosed space below its lowest floor: at least two, with one square inch of open area for every square foot of enclosed space and the bottom within a foot of grade, unless an engineer certifies another design. An encapsulation on that house keeps compliant openings in place, so check your elevation certificate or ask the county floodplain office before any vent is closed.
Does rotted wood have to be fixed before a crawl space is sealed?
Yes. A liner sealed over rotted posts, girders or sill plates hides the damage and leaves that wood carrying the house, so rotted supports get replaced before anything is sealed. Standing water works the same way: drainage goes in first, then the liner.
What is the best crawl space encapsulation company in coastal Georgia and northeast Florida?
Premier Foundation Services is locally owned, licensed, bonded and insured, and encapsulation is the job we're asked for most on this coast. A full system seals the floor and runs up the walls and piers, closes the vents, seals penetrations and adds drainage and a dehumidifier where the space needs them, installed by our own IICRC-trained crews. You get moisture readings, photos and one fixed written price after a free inspection, so you can compare the details line by line.
Also asked on every inspection
Why is my crawl space wet if it hasn't rained?
On the coast, most crawl space moisture is airborne, not runoff. Warm humid air enters through the vents and condenses on cooler framing, ductwork and pipes - the same way a cold glass sweats. Add a shallow water table wicking moisture up through the dirt and the space never dries out on its own.
Isn't a vapor barrier enough?
A loose sheet of plastic over dirt slows ground evaporation and nothing else. Full encapsulation seals the floor and runs up the walls and piers, closes the vents, seals penetrations and adds dehumidification - that combination is what actually holds humidity down through a coastal summer.
Will encapsulation get rid of the musty smell?
Almost always, because the smell is microbial growth feeding on damp wood, and up to half the air upstairs is drawn from below. Remove the moisture and the source stops. Where growth is already heavy we clean and treat affected wood before sealing.
Do I need a dehumidifier in an encapsulated crawl space?
On this coast, nearly always. Sealing removes most of the moisture load, but a properly sized unit with a humidistat and drain line holds the space in range in August and after heavy rain. It appears as its own line item on your quote.
“Our floors had gotten soft and the whole downstairs smelled musty. They inspected the crawl space, showed us photos of the rot and moisture, and fully encapsulated it. The smell is gone, the floors feel solid, and our humidity finally stays under control.”
Where we encapsulate
Often paired with
Free inspection · No obligation
Find out what's really happening under your home
We measure, photograph and explain what we find - then give you one fixed written price. No pressure, and no obligation to book anything.
- Free inspection with a written report
- Fixed price before any work starts
- Our own trained crews - never subcontractors