Crawl space moisture control in Hattiesburg
Water gets under Pine Belt homes in two ways: as humid air and as rain. Controlling a crawl space means handling both.
A wet crawl space usually has more than one cause. A crawl space company's job is to sort out which ones are at work in your house and fix them in the right order: liquid water first, then humidity.
Where is the moisture coming from?
- Humid outdoor air. Pulled in through vents, it condenses on cooler ducts, pipes and framing through Hattiesburg's long summers.
- Rain and runoff. Clogged gutters, short downspouts and yards that slope toward the house send water to the foundation.
- The soil. Low lots and ground near creeks and river bottoms can stay wet well after a storm.
- Leaks. Supply lines, drain pipes, a water heater relief line or a clogged AC condensate drain.
Fixing the water
- Gutters and downspouts that carry roof water well away from the foundation
- Regrading so soil slopes away from the walls instead of toward them
- An interior perimeter drain that feeds a sealed sump basin and pump, for crawl spaces that collect water anyway
Ask where the sump will discharge, whether it has a high-water alarm, and what happens when the power goes out during a storm.
Controlling the humidity
Once the space is sealed, a crawl space dehumidifier on a humidistat is the most common way to keep the air dry. Some editions of the International Residential Code list dehumidification sized at 70 pints a day per 1,000 square feet as one of the approved options for unvented crawl spaces, alongside continuous exhaust or a small supply of conditioned air. Crawl space units are built to fit low clearances and drain continuously, unlike a portable bucket unit set on the liner.
Signs your moisture control isn't keeping up
- The musty smell comes back in July and August
- The dehumidifier runs nonstop but humidity readings stay high
- Water on the liner near the unit, the sump or the walls
- A pump that cycles constantly or doesn't run at all
Routine care
- Clean or change the dehumidifier filter on the manufacturer's schedule
- Check the condensate line and sump discharge after big storms
- Keep gutters clear, especially in pine needle season
Pricing comes from the crawl space company after someone has been under the house with a flashlight and a tape measure. We don't quote prices, and a phone estimate before an inspection is only a ballpark.
Where we connect you with help
Common questions
Should I open my crawl space vents in summer to dry it out?
Usually that adds moisture in south Mississippi. DOE research notes that in humid climates outdoor air is often wetter than crawl space air.
Do I need a sump pump under my house?
Only if water still collects after gutters and grading are fixed. A company can tell you after seeing the space, ideally soon after a heavy rain.
Related services
More background: Hattiesburg crawl space guide.
Damp smell, sweating ducts or a floor that gives underfoot?
Call and get connected with a crawl space company that works in Hattiesburg and the Pine Belt.