Crawl Space Encapsulation in St. Louis, MO

Crawl space encapsulation in St. Louis, MO seals the crawl space floor and walls with a reinforced vapor barrier, closes the vents and gaps, and controls humidity with a dehumidifier, so ground moisture and soil gas stop rising into the house. Air Sense Environmental encapsulates crawl spaces across the City of St. Louis and ties radon control into the same job when a test calls for it.

What are the signs a St. Louis crawl space needs encapsulation?

St. Louis city housing is mostly brick built between 1880 and 1940 on stone and brick foundations, with cellars, coal chutes and floor drains that give soil gas a direct route indoors. Watch for:

• A musty smell on the first floor, strongest after rain
• Floors that feel cold, soft or uneven above the crawl space
• Condensation on ductwork or pipes under the house
• A hygrometer reading above 60 percent in the crawl space
• Higher radon readings in rooms over the crawl space

The St. Louis homes where Air Sense Environmental encapsulates crawl spaces most often:

• Brick homes from 1880 to 1940 with stone or brick foundations
• Two-family and four-family flats, where the first-floor unit sits over the basement
• Gut-rehabbed homes with newly finished basements
• Bungalows in St. Louis Hills and Southampton with full basements

How does crawl space encapsulation work in St. Louis?

1. Inspection. Standing water, drainage, wood moisture and access are checked first.
2. Preparation. Debris is cleared and any drainage or repair work is done before sealing.
3. Vapor barrier. A reinforced barrier is laid over the soil, run up the walls and sealed at every seam and pier.
4. Vents and gaps sealed. Outside air and soil gas entry points are closed.
5. Humidity control. A dehumidifier sized for the space holds humidity in the healthy range.

Does crawl space encapsulation help with radon in St. Louis?

Yes. Exposed soil in a crawl space is a direct radon pathway, and a sealed membrane is the base of a sub-membrane depressurization system. If a the St. Louis radon testing page comes back at or above the EPA action level of 4.0 pCi/L, the encapsulation and the radon system are designed together.

How much does crawl space encapsulation cost in St. Louis, MO?

The price depends on the size of the crawl space, its condition and the drainage and humidity equipment it needs. Current ranges are kept in one place: how much crawl space encapsulation costs in St. Louis. Call 314-664-9807 for a free estimate on a St. Louis home. The main crawl space encapsulation page covers materials and warranty.

St. Louis neighborhoods and nearby communities

Air Sense Environmental works across St. Louis, MO, including Tower Grove, Soulard, The Hill, Dogtown and St. Louis Hills, in ZIP codes 63104, 63109, 63110, 63116 and 63139. Nearby communities with their own service pages:

• Crawl space and radon services in Maplewood, MO
• Crawl space and radon services in University City, MO
• Crawl space and radon services in Affton, MO
• Crawl space and radon services in Clayton, MO
• All Air Sense Environmental service areas

From Our Work