DIYers Are Making A HUGE Mistake With 75% Humidity In Crawl Spaces

Chad from Michigan shares how he transformed his humid, dilapidated crawl space into a clean, dry environment that dramatically improved his home's comfort and air quality. Despite having a new central air system, his house maintained a persistent "clammy cool feeling" until he addressed the 75-78% humidity levels in his crawl space.

• DIY crawl space encapsulation completed in phases over approximately one month
• Initial problem: high indoor humidity (56-58%) despite new AC, with crawl space readings at 75-78%
• First phase involved installing an Aprilaire EO80 dehumidifier and sealing vents
• Complete encapsulation included vapor barrier installation using butyl tape and mechanical fasteners
• Improved ductwork insulation with proper air gaps for better efficiency
• Replaced makeshift entry with professional crawl space inset door featuring magnetic seals
• Added electrical for lighting and a dedicated 20-amp circuit for the dehumidifier
• Insulated rim joists using Dow Froth Pack spray foam
• Installed Wi-Fi water alarms for monitoring potential water issues

{Links and Products Mentioned}
Crawl Space Ninja DIY Store https://supply.crawlspaceninja.com/
Hilti Tools for Rent https://supply.crawlspaceninja.com/co...
Crawl Space Doors https://supply.crawlspaceninja.com/pr...
Aprilaire E080 Dehumidifier https://supply.crawlspaceninja.com/ap...
Dranjer Drain for Sump Pump https://supply.crawlspaceninja.com/dr...

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At Crawl Space Ninja, we’re here to help homeowners take control of their crawl spaces, basements, and indoor air quality. Our videos are packed with expert advice, how-to guides, and product recommendations on:

✅ Crawl Space Encapsulation
✅ Basement Waterproofing
✅ Foundation Repair
✅ Mold Remediation
✅ Indoor Air Quality
✅ Air Purification
✅ Dehumidifiers & Ventilation
✅ DIY Tips & Professional Insights

Whether you're a DIYer or just want to better understand what’s under your home, our mission is to educate and empower you to protect your home and your health.

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0:00 Introduction
0:24 Before Encapsulation
4:09 Motivation for Encapsulating
5:38 Crawl Space Door Before
6:31 After Crawl Space Encapsulation
10:41 HVAC Insulation
12:38 More Before and After Photos
13:45 Crawl Space Door After
16:35 Dehumidifier Installation
17:42 Sump Pump Installation
20:25 Rim Joist Insulation
23:35 Final Words of Encouragement