Crawlspace floor liner
Reinforced sheet material is laid across the soil with overlapped, sealed seams so ground moisture cannot evaporate into the space.
Ground moisture control · Greater Burlington
Vapor barriers for damp basements and crawlspaces.
Bare soil and porous masonry release moisture into the air continuously. A vapor barrier stops that path—but it is a moisture control, not a waterproofing system, and installing one over standing water simply hides the problem.
Common reasons homeowners call
Problems this service can fix.
A dirt-floor crawlspace with damp soil
Persistently high basement or crawlspace humidity
Musty odour rising into the living space
Condensation on ductwork, pipes or cold walls
Rusting fasteners, hardware or appliance bases
Cupping wood floors above a crawlspace
An older liner that is torn, loose or no longer sealed
Repairs and systems
Work we provide.
Depending on the property, the project may use one of these repairs or combine several into a complete system.
Pier and wall detailing
The liner is carried up piers and foundation walls and terminated so the seal is continuous rather than stopping at the dirt.
Basement wall liner
A drainage or vapor liner directs wall moisture behind the finished surface instead of into the room.
Bulk water correction first
Standing water, seepage and drainage faults are addressed before any liner goes down, so water is not sealed underneath.
Sealed and serviceable access
Access points, vents and penetrations are detailed so the space stays sealed and can still be inspected.
Dehumidification
Where sealing alone will not hold the target humidity, a drained dehumidifier is sized for the space.
At your property
How we plan the repair.
We look at the affected area, the foundation, exterior conditions, existing equipment and access so the estimate covers the complete job.
Request an inspection- 01
Whether the floor is soil, gravel or concrete
- 02
Any standing water or evidence of past flooding
- 03
Current humidity and where condensation appears
- 04
Foundation wall material and condition
- 05
Insulation, ducts and utilities in the space
- 06
Structural condition of joists, beams and posts
Your estimate
What is included in the plan.
Water first, liner second
A liner over active water traps it. Drainage, sump and grading corrections belong before the sheet goes down.
Thickness and reinforcement
Thin sheeting tears the first time anyone enters. Ask what material and thickness is included, and whether it is rated to be walked on.
Seams and terminations
An unsealed liner is a partial one. The value is in overlapped, sealed seams and a proper termination at walls and piers.
It is not radon mitigation
Sealing can change airflow in the lowest level. A vapor barrier is not a radon system, and testing is still the only way to know your level.
Already have an estimate?
Compare the complete vapor barrier installation scope.
If Northern Basement Systems, Twin State Basements, 802 Waterproofing or another company has already inspected the property, request a separate estimate and compare quantities, materials, restoration, maintenance, warranty and price.
Common questions
Vapor Barrier Installation FAQs
These answers cover the questions homeowners ask most often. Your inspection and written estimate will address the conditions at your home.
Is a vapor barrier the same as encapsulation?
No. A vapor barrier is the sheet that stops ground moisture. Encapsulation is the complete system: drainage, a sealed and detailed liner, air sealing, insulation changes and usually dehumidification. A liner alone is one component of that.
Can a vapor barrier be installed over a wet crawlspace floor?
It should not be. Sealing over standing water or active seepage traps the water beneath the sheet and the space stays damp. Drainage and any sump work come first.
Does a vapor barrier help with radon?
Sealing work can change how the lowest level of a home ventilates, in either direction. It is not a radon mitigation system, and Vermont health guidance recommends testing because radon cannot be seen or smelled. Test after the work regardless.
Request local service
Schedule vapor barrier installation service in Greater Burlington.
Tell us what is happening at the property and when you would like it inspected.