Crawl Space Encapsulation
Most requestedA sealed liner across the floor, piers and walls, taped and mechanically fastened, with the vents closed and the space dried. It is the full system, not a sheet of plastic laid on dirt.
Encapsulation details
Crawl Space Encapsulation in Wilmington, NC
910 Crawl Space Pros is a crawl space encapsulation and moisture control company serving Wilmington and the Cape Fear coast — with the groundwater dealt with before anything gets covered up. Published pricing, written scopes, and a liner that meets ASTM E1745 rather than a builder sheet.
- Free on-site inspection
- Published pricing up front
- Serving Wilmington and New Hanover, Brunswick and Pender counties
- Free quotes within 24 hours
Get a free crawl space inspection
Free quotes within 24 hours. No obligation.
- ASTM E1745 reinforced liner
- IRC R408.3 closed crawl space
- Class I vapor retarder (<0.1 perm)
- ICC-ES certified flood vents
- Written scope before work starts
What a wet Cape Fear crawl space does to the house above it
Roughly 57 inches of rain a year, a high water table, and humid outside air for most of the year. A vented crawl space here does not dry out — it takes the moisture in.
Musty smell upstairs
Air moves up through a house. If the crawl space is damp, you are breathing crawl space air in the living room.
Cupping wood floors
Hardwood over a humid crawl space takes on moisture from below and lifts at the edges. It shows up first in rooms over the worst section.
Mold on the framing
Fungal growth needs wood, warmth and moisture. Two of those are permanent; the crawl space decides the third.
Floors that give
Sustained moisture softens joists and girders. Bounce underfoot is usually the first thing anyone notices.
Crawl space services
Fourteen crawl space services across Wilmington and the Cape Fear region. Each page covers what the work involves, what it costs, and when it is the wrong answer.
Crawl Space Insulation
Most requestedWall insulation for a sealed crawl space, or subfloor batts for a vented one. Which is correct depends on whether the space is closed — installing the wrong one traps moisture against wood.
Insulation detailsCrawl Space Waterproofing
Most requestedStopping water getting in, before anything gets sealed. Grading, downspout extensions, perimeter drainage and a sump where the water table demands it.
Waterproofing details
Crawl Space Mold Removal
Most requestedRemove the growth, treat the framing, and fix the moisture that fed it. Cleaning without correcting the humidity means it returns within a season here.
Mold Removal details
Crawl Space Vapor Barrier Installation
Reinforced 12–20 mil liner meeting ASTM E1745, seams taped and terminated at the wall — not the 6 mil builder sheet that tears the first time someone crawls on it.
Vapor Barrier details
Crawl Space Dehumidifier Installation
A unit sized to the actual cubic footage with a condensate pump and a drain that goes somewhere. Undersized units run constantly and never reach target.
Dehumidifier details
Crawl Space Drainage
Perimeter drain tile below the vapor barrier, pitched to a sump. This goes in before the liner — retrofitting drainage under a finished encapsulation means pulling it up.
Drainage detailsCrawl Space Sump Pump Installation
A sealed basin, a pump rated for the volume, a check valve and a discharge line that carries water away from the foundation rather than back to it.
Sump Pump detailsCrawl Space French Drain
A gravel-bedded perforated line intercepting groundwater at the footing. The right answer where water arrives through the soil rather than over it.
French Drain detailsCrawl Space Cleanup
Removing fallen insulation, construction debris, old torn plastic and animal contamination — the step that has to happen before any liner goes down.
Cleanup detailsCrawl Space Structural Repair
Sistered joists, replaced girders and adjustable steel jacks on proper footings, where moisture has already cost you framing.
Structural Repair detailsSagging Floor Repair
Floors that bounce or slope usually trace to a failed girder, a settled pier or rot at the band joist. We find which before lifting anything.
Sagging Floors detailsCrawl Space Door Replacement
An insulated, gasketed, lockable access door set in a proper frame. The single most common air and water leak in an otherwise sealed crawl space.
Access Door detailsFlood Vent Installation
ICC-ES certified engineered openings that let floodwater pass through the foundation instead of collapsing it — and that satisfy NFIP requirements in an AE or VE zone.
Flood Vents detailsHow the work runs
- 01
You call or send the form
Tell us what you are seeing — standing water, a musty smell upstairs, a floor that gives. We book a look.
- 02
On-site assessment
We measure crawl space humidity and moisture content in the framing, check for standing water, and photograph what we find.
- 03
Written scope and price
A line-by-line scope: what gets done, in what order, and what each part costs. No pressure to sign on the visit.
- 04
The work, in the right order
Water first, then remediation, then the liner, then conditioning. Sealing before drainage is what makes systems fail.
Not sure what your crawl space needs?
A free on-site inspection puts a number and a scope in front of you, with no obligation.
What crawl space work costs in Wilmington
Published up front, because you should not have to book a visit to find out whether this is a $2,000 job or a $12,000 one. A full encapsulation in the Wilmington area runs $4,200 – $14,000, with a typical project near $5,500.
| Component | What it buys | Typical cost |
|---|---|---|
| Vapor barrier (reinforced 12–20 mil) | The core component. Reinforced liner sealed across the floor, piers and walls — not the 6 mil builder sheet. | $1,500 – $4,000 |
| Vent sealing | Closing and sealing foundation vents to convert the space to a closed crawl space. | $300 – $1,000 |
| Dehumidifier (installed) | A unit sized to the cubic footage, with a condensate pump and drain line. | $1,200 – $2,500 |
| Drainage + sump pump only if needed | Perimeter drain and sump. Only where the crawl space takes on water — and it goes in before the liner. | $1,500 – $5,000 |
| Mold removal & wood treatment only if needed | Only where there is active growth. Remove, treat the framing, and dry before sealing. | $500 – $4,000 |
| Full encapsulation (combined) | Wilmington-area range. A dry crawl space needs liner, vent sealing and a dehumidifier; one that takes on groundwater needs drainage first, which is most of the spread. | $4,200 – $14,000 |
What moves the price: crawl space square footage, working clearance, whether groundwater has to be dealt with first, and how much of the framing needs treatment.
DIY, cheap quote, or done properly
Most of the price difference between quotes is not labour — it is which of these steps the quote silently leaves out.
| DIY | Cheapest quote | Done properly | |
|---|---|---|---|
| Liner | 6 mil builder sheet, laid loose | 6–8 mil, taped seams, not fastened to walls | Reinforced 12–20 mil to ASTM E1745, sealed to piers and walls |
| Groundwater | Not addressed | Sealed over — water ends up under the plastic | Drainage and sump first, liner second |
| Humidity control | None, or a household dehumidifier on an extension cord | Undersized unit, condensate draining to the soil | Unit sized to cubic footage, pumped to a proper discharge |
| Vents | Left open, or foam blocks pushed in | Covered, not sealed | Sealed and detailed so the space is genuinely closed |
| Wood already affected | Bleach from a spray bottle | Surface treated, moisture source left in place | Growth removed, framing treated, dried, then sealed |
| What it costs | $300 – $900 in materials | $1,500 – $3,000 | $4,200 – $14,000 |
| How long it holds | A season or two | Often fails within a few years | Liner life measured in decades when water is handled first |
Why a Wilmington crawl space is not a Raleigh crawl space
910 Crawl Space Pros works exclusively on the Cape Fear coast, and the difference from inland North Carolina is the water table. Much of Wilmington sits low over sandy soil that drains fast at the surface and then stops. After a sustained storm the ground under a crawl space can stay saturated for days — long enough for standing water to appear under homes that have never flooded above grade.
The second difference is the air. Crawl space vents were designed on the assumption that outside air is drier than the air under the house. On this coast, for most of the year, it is not. Venting pulls humid air across framing that sits below the dew point, and it condenses there. That is why closing and conditioning the space outperforms venting it here, and it is the finding behind the Advanced Energy closed-crawl-space research carried out in North Carolina.
The practical consequence is sequence. Sealing a crawl space that still takes on groundwater traps water under the liner instead of keeping it out. On older homes downtown and through Forest Hills — brick piers, open perimeter walls, low clearance — drainage and grading come first, then the liner, then conditioning.
Crawl space questions we get from Wilmington homeowners
- How much does crawl space encapsulation cost in Wilmington?
- Most full encapsulations in the Wilmington area run $4,200 – $14,000, with a typical project near $5,500. The spread is almost entirely drainage: a dry crawl space needs liner, vent sealing and a dehumidifier, while one that takes on groundwater needs a perimeter drain and sump first.
- Is encapsulation actually worth it on the coast?
- In the Cape Fear region it is a stronger case than inland, because the outside air we would otherwise be venting into the crawl space is humid for most of the year. Sealing and conditioning removes the moisture source that drives mold, cupped floors and framing rot.
- Do I need a vapor barrier or full encapsulation?
- A vapor barrier is one component of encapsulation. A liner alone slows moisture coming up from the soil but leaves the vents open and the humidity uncontrolled. Full encapsulation seals the vents and conditions the space, which is what actually holds relative humidity down.
- What happens if there is standing water under the house?
- Drainage goes in first — perimeter drain, sump, and a discharge that carries water away from the foundation. Sealing over standing water traps it under the liner where it cannot evaporate, which is worse than leaving it alone.
- How long does the work take?
- A straightforward encapsulation on an accessible crawl space is one to three days. Drainage, mold treatment or structural repair extend that, and those are common in older Wilmington homes.
- Will encapsulation fix a musty smell in the house?
- Usually, because that smell is generally crawl space air. Air moves upward through a house, so a damp crawl space vents through the living space. Removing the moisture source removes the odour — cleaning without fixing the humidity does not.
Get a quote for your crawl space
Free quotes within 24 hours. Tell us what you are seeing and we will price the fix.
Get crawl space encapsulation priced for your home
Wilmington and New Hanover, Brunswick and Pender counties. Free on-site inspection, written scope, no obligation.