Under the house
Crawl Space Encapsulation in Gulfport, MS
Damp, musty crawl spaces and open raised floors sealed and insulated for the coast.
- Free estimates after we look at the house
- Quotes list foam type, thickness and R-value for each area
- Roof leaks, damp wood and termite access checked before we spray
Two Kinds of Under-House Problems
Crawl space encapsulation seals the space under a house from outside air and ground moisture with a heavy vapor barrier, sealed vents and insulated walls. On the coast, where summer air is warm and loaded with moisture, a vented crawl space pulls that air in, it hits cooler ductwork and floor framing, and you get condensation, musty smells, cupping floors and mold on the joists. Sealing the space keeps that air out.
Raised homes on piers
Many homes near the water sit up on piers with the floor open underneath. There is no crawl space to seal, so the fix is insulating the floor itself. We spray closed-cell foam on the underside of the subfloor and around ducts and plumbing that pass through. Closed cell holds up to the moisture and slows vapor. ENERGY STAR suggests R-13 for floors in Zone 2.
Termite access
Mississippi State University Extension reports Formosan subterranean termites established in Harrison and Hancock counties and notes that foam can hide leaks and infestations. Before we cover sill plates or foundation walls, we plan where inspection gaps need to stay and talk it over with you and your pest control company.
Signs it is time
Musty smell inside, high indoor humidity, wavy or soft wood floors, sweating ducts under the house, standing water after storms, or a pest company noting moisture in the report.
What We Do Under the House
Each piece priced separately.
Vapor barrier
Heavy polyethylene over the ground and up the walls, seams taped, edges fastened.
Vent and opening sealing
Foundation vents and access gaps closed so humid outside air stays out.
Wall insulation
Closed-cell foam on crawl space walls with an inspection strip left where needed.
Raised floor foam
Closed-cell foam on the underside of subfloors for homes on piers.
Debris and old batts
Fallen or wet batts and construction debris removed before sealing.
Published Crawl Space Costs
| Job | Range and source |
|---|---|
| Crawl space encapsulation | $3 to $10 per sq ft, $3,000 to $15,000 (HomeGuide) |
| Crawl space vapor barrier | $1,200 to $4,000 (HomeGuide) |
| Closed-cell on crawl space walls | $2 to $5 per sq ft (HomeGuide) |
| Crawl space vent sealing | $150 to $450 (HomeGuide) |
| Crawl space, spray foam | $2,000 to $4,000 (HomeGuide); $1,000 to $5,900 (Fixr) |
| Closed-cell, installed | $3.00 to $5.00 per sq ft (HomeGuide) |
Sources: HomeGuide's 2026 crawl space encapsulation and spray foam guides, and Fixr (2025). Square footage, height of the space, drainage, debris and access set the final number. After we crawl it we give you a written estimate, and that is the price.
Crawl Space Job Steps
1. Crawl and document
We check moisture, framing, ducts, standing water and termite signs, and take photos.
2. Plan and quote
Barrier, sealing, wall or floor foam and cleanup, each priced.
3. Clean out
Debris and failed insulation removed.
4. Seal and insulate
Barrier installed, vents sealed, foam applied with inspection access planned.
5. Review
Walk-through with photos of the finished space.
Crawl Space Encapsulation Questions
Is encapsulation better than insulating the floor?
If you have an enclosed crawl space, encapsulation treats the whole space and the ducts in it. If the house is on open piers, there is nothing to enclose, so floor foam is the answer. Some houses with partial skirting need a mix.
Do I need a dehumidifier after encapsulating?
Many sealed crawl spaces in humid climates do need one, or a small supply of conditioned air, to keep moisture in check. We tell you which we would recommend for your space.
Will foam under my floor stop termite inspections?
It can make them harder, which is why we plan inspection access before spraying near sills. Talk with your pest control company about what they need to see.
Can a flooded crawl space be encapsulated?
Drainage problems need fixing first. A liner does not stop water flowing in after storms. We point out drainage issues and seal once the space stays dry.
Crawl Space Encapsulation Service Areas
- Spray Foam Insulation in Gulfport, MS
- Spray Foam Insulation in Long Beach, MS
- Spray Foam Insulation in Pass Christian, MS
- Spray Foam Insulation in DeLisle, MS
- Spray Foam Insulation in Diamondhead, MS
- Spray Foam Insulation in Kiln, MS
- Spray Foam Insulation in Bay St. Louis, MS
- Spray Foam Insulation in Waveland, MS
- Spray Foam Insulation in Pearlington, MS
- Spray Foam Insulation in Lyman, MS
- Spray Foam Insulation in Saucier, MS
- Spray Foam Insulation in Wiggins, MS
Get a Crawl Space Encapsulation Estimate
Get the space under your house dry and sealed.