Crawl Space Encapsulation
Crawl Space Encapsulation
High humidity in your crawl space — often caused by leaky foundation walls and exposed dirt — leads to mold and mildew growth, structural damage, poor indoor air quality, and wasted energy dollars.
Smart Space has been professionally encapsulating crawl spaces in residential homes for over 12 years.
Financing available
Ask About Energy rebates and incentives
Financing available
Ask About Energy rebates and incentives
How do I know if I need Crawl Space Encapsulation?
Poor Indoor Air Quality? Moisture Issues? Cold Floors?
Poor Indoor Air Quality?
↑ Before
- Musty or damp smells in the home
- Allergy flare-ups that never fully go away
- Dust returning quickly after cleaning
↓ After Encapsulation
- Clean, sealed air boundary
- Reduced allergens and airborne contaminants
- Healthier indoor air year-round
Moisture, Mold, Structural Damage?
↑ Before
- Standing water or damp soil
- Visible mold or mildew
- Sagging insulation
- Condensation on wood or ductwork
↓ After Encapsulation
- Dry, sealed crawl space
- Protected wood framing and insulation
- Long-term structural stability
Cold Floors & High Energy Bills?
↑ Before
- Cold floors in winter
- Sticky, humid rooms in summer
- HVAC running constantly
↓ After Encapsulation
-
- Even indoor temperatures
- Reduced humidity
- More comfortable living spaces year-round
We offer free estimates. Book a Consultation Today!
Our Process
Step 1: Air Seal
Seal off rim joists and crawl space vents to eliminate air leakage.
Step 2: Vapor Barrier
Install a heavy-duty, 16-mil string reinforced vapor barrier on the crawl space floors, walls, and columns.
Step 3: Secure Attachment
Fasten the vapor barrier to the foundation walls using Ramset nails for a durable long lasting tight seal.
Step 4: Heat Seal Seams
All seams in the vapor barrier are heat-sealed to create a continuous moisture barrier. Tape fails. Heating Sealing the seams does not.
Step 6: Insulate Exterior Walls
Place insulation over the vapor barrier on crawl space exterior walls to improve thermal performance. We are critical of using Spray foam in crawl space.
Step 7: Seal & Insulate Access Hatches
Weatherstrip the crawl space entrance and install 2″ foam board insulation to the access door or hatch.
The Building Science of Crawl Spaces
Our Crawl Space Encapsulations are engineered for long-lasting protection and performance. We follow industry best practices by heat-sealing all seams, securely fastening the vapor barrier to walls and columns, and air-sealing and insulating the foundation walls to create a durable, energy-efficient, and healthy environment beneath your home.
Want to dive deeper into the building science and research behind our approach?
What Is Crawl Space Encapsulation?
Crawl space encapsulation is the process of converting a vented crawl space into a sealed, conditioned zone within the home’s building envelope. It involves installing a continuous vapor barrier over the soil and foundation walls, air-sealing all seams, vents, and penetrations, and insulating the perimeter walls to control heat transfer. This integrated system minimizes ground moisture, air infiltration, and condensation, stabilizing temperature and humidity levels while improving structural durability and energy efficiency.
Understanding Moisture & Humidty
Crawl spaces are often filled with moisture — creating the perfect environment for mold, mildew, and wood decay, while attracting insects and rodents. This moisture and its contaminants can be pulled into your living areas due to air pressure differences between the crawl space and the rooms above. The problem is even worse when HVAC equipment is located in the crawl space, spreading that damp air throughout your home.
While traditional building codes have long required passive vents and a vapor barrier, research shows that venting actually increases humidity during warm, humid months — even with proper drainage and damp-proofing systems in place.
In vented crawl spaces, humidity levels track outdoor conditions (70–95%). When vents are sealed and a vapor barrier is installed, relative humidity stabilizes near 50%. Mold and mildew thrive above 70%, highlighting the importance of encapsulation.
How Crawl Spaces Affect Indoor Air Quality
Your crawl space directly affects the air circulating through your home:
- Leaky HVAC ducts can pull in pollutants, dust, and mold spores from the crawl space and distribute them throughout your living areas.
- Winter pressure shifts cause air from the crawl space to rise through the home, drawing in even more contaminants.
Comfort & Energy Efficiency
Encapsulation helps stabilize your home’s temperature and comfort level year-round:
- Cold winter air enters through vents and gaps, chilling floors.
- Air sealing and insulating walls keeps the crawl space dry in summer and warm in winter.
- HVAC systems run more efficiently when ducts are in a conditioned crawl space.
- Homeowners often notice warmer floors and improved comfort after encapsulation.
Ready to make your crawl space work for you?
Ready to clean your crawl space?
What People Are Saying
Smart Home Atlanta did an outstanding job with our energy audit, duct sealing, and crawlspace encapsulation. The difference in efficiency, humidity, and air quality has been massive. High-quality work, excellent communication, and very informative throughout the process—highly recommend!
Partners & Certifications
