Crawl Space Encapsulation Services
Crawl space encapsulation is the most effective long-term solution for moisture, mold, and energy loss. Find local specialists and compare quotes.
$5,500
Average Cost
$3K–$8K
Cost Range
15–25 yrs
Lasts
What Encapsulation Includes
Vapor Barrier
Thick polyethylene sheeting (12–20 mil) covers the floor and walls
Vent Sealing
Foundation vents are permanently sealed to block outdoor air
Wall Insulation
Rigid foam insulation on crawl space walls (R-10 to R-19)
Dehumidifier
Crawl space dehumidifier maintains humidity below 50%
Drainage (Optional)
Interior drain channel if water intrusion is present
Pre-Treatment
Antimicrobial treatment on wood surfaces if mold is present
Benefits of Encapsulation
- ✓ Eliminates moisture and prevents mold growth
- ✓ Improves indoor air quality throughout your home
- ✓ Reduces energy bills by 10–20%
- ✓ Warmer floors in winter
- ✓ Protects structural wood from rot
- ✓ Reduces pest activity
- ✓ Adds value when selling your home
Frequently Asked Questions
What is crawl space encapsulation?
Crawl space encapsulation seals your crawl space from outside air and moisture. It typically includes installing a thick polyethylene vapor barrier on the floor and walls, sealing foundation vents, insulating the walls, and often adding a dehumidifier.
How long does crawl space encapsulation last?
A professionally installed encapsulation system lasts 15–25 years with minimal maintenance. The vapor barrier itself (especially 20-mil products) can last 25+ years. Dehumidifiers should be serviced annually and replaced every 8–12 years.
How do I find a good crawl space encapsulation contractor?
Look for contractors who: specialize in crawl space work (not general contractors), offer free inspections, provide written warranties on both labor and materials, have local reviews and references, and use name-brand vapor barrier products (not thin 6-mil plastic).
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