Memorial Day weekend marks the unofficial start of humidity season in Northeast Arkansas. If your crawl space doesn't have proper vapor barrier protection, you're about to find out the hard way.
Moisture from the ground rises through concrete and dirt floors year-round, but summer's 80%+ humidity makes it worse. Without a 6-mil polyethylene vapor barrier (minimum per IRC Section R408.2), you'll get condensation, mold, and rotting floor joists.
We sealed a crawl space in Trumann last week where the homeowner complained about "musty smells" every summer. The dirt floor had zero protection. Relative humidity was reading 78% down there while outside air was only 65%.
Proper vapor barrier installation isn't just laying plastic sheeting. Seams need 6-inch overlaps with mastic sealant. Edges must run 6 inches up foundation walls and seal with construction adhesive. Punctures from rocks or debris defeat the whole system.
Combine the vapor barrier with crawl space encapsulation (sealed vents, insulated walls), and you'll drop humidity levels to 45-50% even in July. Your HVAC won't work as hard, and you'll eliminate that damp basement smell.
The investment pays back in lower cooling costs and prevents expensive floor repairs down the road. A typical 1,200 SF crawl space runs $1,200-1,800 for complete vapor barrier installation.
Reply or DM us for a free crawl space assessment before the real humidity hits Jonesboro.