What is a Crawl Space Vapor Barrier?
A crawl space vapor barrier is a heavy-duty liner laid over exposed soil to keep ground moisture from evaporating into the crawl space air. Depending on the system installed, the liner may also run up the foundation walls for added moisture protection.
Unlike loose plastic sheeting, a professionally installed vapor barrier uses durable, reinforced material with the seams overlapped and sealed for more continuous coverage. For a more complete seal of the crawl space, crawl space encapsulation may be recommended. Vapor barriers can also be used in basements, where a basement wall vapor barrier helps handle moisture coming in through foundation walls.
Symptoms
Signs Your Nashville Crawl Space Needs a Vapor Barrier
Moisture rising from exposed soil can make a crawl space damp and humid, but the signs aren’t always confined to the space below your home. You may notice changes in your living space or issues with the wood, insulation and other materials beneath your floors. Signs of excess crawl space moisture include:
- A musty, damp odor
- Mold or mildew
- High humidity inside the home
- Damp or sagging insulation
- Rotting joists, beams and floor framing
- Bouncy or uneven floors
- A rise in pest activity
- Rising heating and cooling costs
A professional inspection can identify whether ground moisture is contributing to the problem and whether a crawl space vapor barrier is the right fix.
How It Works
Our Crawl Space Vapor Barrier Installation Process
Our Crawl Space Vapor Barrier & Moisture Control Solutions
For Ground Moisture, Musty Odors and Moisture-Related Wood Damage
Reinforced Crawl Space Vapor Barrier
A reinforced crawl space vapor barrier forms a durable layer between your home and the exposed soil below it. Installed across the crawl space floor with seams overlapped and sealed, the liner limits ground moisture from evaporating into the space and helps create drier conditions that are less conducive to mold and wood rot.
For Humid Outdoor Air Entering the Crawl Space
Sealed Crawl Space Vent Covers & Access Doors
Ground moisture isn’t the only source of humidity below your home. Uncovered vents and poorly sealed access points can allow warm, humid outdoor air into the crawl space. Sealing the vents and installing a properly fitted crawl space access door helps cut down on outside air and moisture entry so your vapor barrier system works more effectively.
For Standing Water and Waterlogged Soil
Crawl Space Drainage Matting & Sump Pump
A vapor barrier controls water vapor, but it isn’t designed to solve standing water beneath your home. When groundwater or seepage is present, crawl space drainage can collect and direct water to a sump pump for removal. Drainage matting under the liner can also create space for water to travel toward the drainage system.
For Humidity That Remains After the Liner Is Installed
Crawl Space Dehumidifier
A vapor barrier reduces moisture coming from the ground, but humidity can remain in the crawl space air. If additional moisture control is needed, a crawl space dehumidifier draws excess water vapor from the air and automatically works to keep humidity levels more consistent as conditions change.
Why a Heavy-Duty Crawl Space Liner Matters
Crawl spaces can be tough on thin plastic. Rough soil, rocks, foot traffic and service work will puncture or tear lightweight material over time. A durable, reinforced crawl space liner is made for these conditions, providing longer-lasting protection while helping keep ground moisture out of the crawl space.
What To Expect
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