Crawlspace Air-Sealing

Crawl space air sealing is the process of closing gaps, cracks, and penetrations that allow outside air, moisture, odors, and pests to enter your home through the crawl space.

 

Unlike insulation, which slows heat transfer, air sealing stops uncontrolled airflow. When done correctly, it dramatically improves comfort, indoor air quality, and energy efficiency.

 

Why Crawl Space Air Sealing Is Critical

 

Your crawl space is directly connected to your living space. Unsealed gaps allow:

•Cold and hot air infiltration

•Moisture and humidity intrusion

•Mold spores and allergens to travel upward

•Pest and rodent entry

•Higher heating and cooling costs

 

Air sealing turns the crawl space into a controlled environment, preventing these problems at the source.

 

Common Air Leaks in Crawl Spaces

 

Air leakage typically occurs around:

•Rim joists and band boards

•Plumbing penetrations

•Electrical and HVAC openings

•Foundation cracks and seams

•Access doors and hatches

•Duct chases and framing gaps

 

Even small openings can add up to significant energy loss.