We will tell you if crawl Space Vapor Barrier Installation is not what your Johns Island crawl space actually needs. Doing this stage out of order is the most common reason the work has to be repeated.
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 Johns 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.
Flood-zone construction around Johns Island is built elevated, which means newer homes have crawl spaces too. Newer framing, the same conditions underneath.
Johns Island at a glance
| County | Charleston County |
|---|---|
| ZIP | 29455 |
| Elevation | about 10 ft |
| Region | Lowcountry and coastal plain |
Named water nearby
- Bloody Dick Swamp (swamp)
- Isinglass Swamp (swamp)
- Bear Swamp (swamp)
- the Rantowles Creek (stream)
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 Johns 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
The gap between a drying job and a structural repair in Johns Island 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 Johns Island: common questions
Barrier or full encapsulation for a Johns 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.
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 Bloody Dick Swamp, 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 Johns Island property changes that.
How do I know whether it is groundwater or a leak?
That is the first thing we establish on a Johns Island call, because everything after it depends on the answer. A supply line, a drain, water rising through the soil and runoff coming in through the vents each leave different evidence.
Do you work outside Johns Island itself?
Yes. We cover Charleston County broadly, including Ravenel, Hollywood and North Charleston, and the rest of the Lowcountry and coastal plain of South Carolina.
Will a barrier fix water that is already coming in?
No. A barrier manages soil moisture and vapor, not liquid water under pressure. If groundwater or surface runoff is entering the space, that needs drainage and a sump before a barrier will do its job.
Vapor barrier near Johns Island
We cover Johns Island and the surrounding part of Charleston County. The same service in nearby towns:
Other crawl space services in Johns Island
Crawl Space Water Removal in Johns Island
Standing water pumped and extracted from under the house, then the saturated material taken out.
Crawl Space Structural Drying in Johns Island
Joists, girders and subfloor dried back to a measured target with air movers and dehumidification.
Crawl Space Mold Remediation in Johns Island
Contained removal of mold-affected material, HEPA cleaning, and the moisture source shut off.
Crawl Space Drainage and Sump Pump Installation in Johns 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 Johns Island
Rotted joists, girders, rim joists and subfloor sections repaired or replaced once the space is dry.
Or see everything we cover in our Johns Island service area, and how this service works across the state on the South Carolina page.
Crawl Space Vapor Barrier Installation in Johns 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.