crawl Space Vapor Barrier Installation is rarely the whole job. On a Johnsonville property it sits inside a sequence — the source gets established first, and whatever follows depends on what that inspection finds.
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 Johnsonville 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.
In Johnsonville the complication is the water table. It sits close enough to the surface that soil under a house can be saturated with nothing broken, so this work is usually dealing with moisture arriving from below rather than from a failure inside the house.
Johnsonville at a glance
| County | Florence County |
|---|---|
| ZIP | 29555 |
| Elevation | about 89 ft |
| Region | Lowcountry and coastal plain |
Named water nearby
- King River Pond (reservoir)
- Old River Lake (lake)
- Johnsville Country Club Lake (reservoir)
- Tie Lake (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
What is included on a typical Johnsonville property:
- 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
The gap between a drying job and a structural repair in Johnsonville is usually measured in seasons, not years.
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 Johnsonville: common questions
There is already plastic under my Johnsonville 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.
Will a barrier stop water that is already getting in?
No. A barrier manages soil moisture and vapor, not liquid water under pressure. If water is entering the space near King River Pond, drainage comes first or the sheeting simply floats on it.
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 Johnsonville property changes that.
Will my Johnsonville crawl space dry out if I open the vents?
Usually not. For much of the year the air around Johnsonville is warmer and wetter than the crawl space, so opening it up deposits moisture on the cool joists instead of carrying it away.
Does storm flooding reach crawl spaces around Johnsonville?
Yes, and often with nothing visibly broken. After a tropical system the usual picture in Florence County is a saturated crawl space where the water came up through the ground rather than out of a pipe.
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 Johnsonville
We cover Johnsonville and the surrounding part of Florence County. The same service in nearby towns:
Other crawl space services in Johnsonville
Crawl Space Water Removal in Johnsonville
Standing water pumped and extracted from under the house, then the saturated material taken out.
Crawl Space Structural Drying in Johnsonville
Joists, girders and subfloor dried back to a measured target with air movers and dehumidification.
Crawl Space Mold Remediation in Johnsonville
Contained removal of mold-affected material, HEPA cleaning, and the moisture source shut off.
Crawl Space Drainage and Sump Pump Installation in Johnsonville
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 Johnsonville
Rotted joists, girders, rim joists and subfloor sections repaired or replaced once the space is dry.
Or see everything we cover in our Johnsonville service area, and how this service works across the state on the South Carolina page.
Crawl Space Vapor Barrier Installation in Johnsonville
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.