On a Sullivans Island job, crawl Space Vapor Barrier Installation follows from the inspection rather than preceding it — there is no point specifying this work before the source of the water is known.
Bare soil under the house is evaporating moisture into the space every day.
Vapor barrier on lowcountry and coastal plain ground
A barrier earns its keep faster around Sullivans Island than almost anywhere. With the water table close to the surface the soil underneath is damp more or less permanently, so an uncovered crawl space floor is evaporating into the space every day of the year.
Low ground and a long wet season change what this work has to withstand around Sullivans Island. Homes near the Cooper River in particular tend to need the drainage question answered as well, or the space simply returns to how it was.
Sullivans Island at a glance
| County | Charleston County |
|---|---|
| ZIP | 29482 |
| Elevation | about 7 ft |
| Region | Lowcountry and coastal plain |
Named water nearby
- the Cooper River (stream)
- the Ashley River (stream)
- the Wando River (stream)
- Lake Woodlawn (lake)
Signs you need this
- Bare soil anywhere on the crawl space floor
- Existing sheeting that is torn, bunched or not sealed at seams
- Barrier that stops short of the walls and piers
- Crawl space relative humidity holding above 60 percent
What the work involves
On a Sullivans Island job this covers:
- Clearing and preparation of the crawl space floor
- Reinforced polyethylene barrier across the full soil area
- Overlapped and sealed seams
- Barrier carried up and sealed to walls and piers
Why it is worth dealing with now
Nothing about a damp Sullivans Island crawl space improves on its own. The space is enclosed, shaded and over soil — all three work against it drying out.
The full method and the step-by-step for this work is on the Crawl Space Vapor Barrier Installation page, and how it behaves across the state is on the Vapor barrier in South Carolina page.
Vapor barrier in Sullivans Island: common questions
Barrier or full encapsulation for a Sullivans Island home?
A barrier covers the ground and stops soil moisture. Encapsulation seals the walls and vents too and controls humidity directly. Which one your Charleston County property needs should follow a humidity reading, not a preference.
There is already plastic under my Sullivans Island house. Is that enough?
Often not. Most of what we find has been laid loose, has torn, or was never sealed at the seams and walls. Unsealed sheeting performs much closer to bare soil than to a finished barrier.
Does storm flooding reach crawl spaces around Sullivans Island?
Yes, and often with nothing visibly broken. After a tropical system the usual picture in Charleston County is a saturated crawl space where the water came up through the ground rather than out of a pipe.
Will my Sullivans Island crawl space dry out if I open the vents?
Usually not. For much of the year the air around Sullivans Island is warmer and wetter than the crawl space, so opening it up deposits moisture on the cool joists instead of carrying it away.
Can I stay in the house while the work is done?
In almost all cases, yes. The work happens under the floor, and access is usually through an exterior hatch. We will tell you up front if anything about your Sullivans Island property changes that.
I already have plastic down there. Is that enough?
Often not. Most of the sheeting we find has been laid loose, has torn, has pulled away from the walls or was never sealed at the seams. Unsealed, incomplete sheeting lets ground moisture track around and through it, and performs much closer to bare soil than to a finished barrier.
Vapor barrier near Sullivans Island
We cover Sullivans Island and the surrounding part of Charleston County. The same service in nearby towns:
Other crawl space services in Sullivans Island
Crawl Space Water Removal in Sullivans Island
Standing water pumped and extracted from under the house, then the saturated material taken out.
Crawl Space Structural Drying in Sullivans Island
Joists, girders and subfloor dried back to a measured target with air movers and dehumidification.
Crawl Space Mold Remediation in Sullivans Island
Contained removal of mold-affected material, HEPA cleaning, and the moisture source shut off.
Crawl Space Drainage and Sump Pump Installation in Sullivans Island
Interior drainage to collect water, a sump and pump to lift it, and a discharge that takes it away.
Crawl Space Wood and Subfloor Repair in Sullivans Island
Rotted joists, girders, rim joists and subfloor sections repaired or replaced once the space is dry.
Or see everything we cover in our Sullivans Island service area, and how this service works across the state on the South Carolina page.
Crawl Space Vapor Barrier Installation in Sullivans Island
Call (888) 724-1354 and tell us your street and what the space looks like. We will tell you whether this is the right stage to start at.
Tell us what you are seeing under the house and we will tell you what it needs.