A wet crawl space drives up humidity, feeds mold, and shortens the life of framing and HVAC. Crawl space waterproofing stops bulk water, blocks ground vapor, and controls the air so the space stays dry and the first floor breathes cleaner. Homes across Camden, Burlington, and Gloucester Counties see repeat issues after heavy rain and summer humidity. This page explains what works and how our team installs it.
Why crawl spaces get wet here
Clay-heavy soils and high water tables push moisture through block walls and up from bare earth. Open vents let humid summer air hit cool surfaces and condense. Over time that can cup hardwoods, rust ducts, and push musty air into living rooms and bedrooms.
Signs you need service
You don’t need standing water to have a problem. Watch for a musty smell, efflorescence on block, drooping fiberglass, rust on HVAC, cold floors in winter, or indoor humidity that spikes when the AC runs after a storm.
The system that works
- Encapsulation: reinforced ground vapor barrier sealed to piers and walls, seams taped tight
- Interior drain: footing-level perimeter drain to a sealed sump basin with a check valve
- Sump pump: sized for local storm events with a protected discharge to daylight or a dry well
- Wall approach: foam board or liner on walls and rim-joist air sealing to cut condensation
- Drying: crawl-rated dehumidifier or a controlled supply from conditioned air
- Access: tight, insulated door and closed vents to keep humid air out
Encapsulation vs. open vents
Open vents invite wet air. Encapsulation creates a continuous barrier over the soil and walls so ground vapor stays down and surfaces stay warmer. Pairing the liner with a drain and sump gives water a path out before it reaches the liner. The result is steadier indoor humidity and fewer mold-friendly surfaces.
Drainage, pumps, and discharge
A footing-level interior drain is the workhorse for bulk water. The line carries water to a sealed basin with a pump on a dedicated circuit. The discharge should exit away from the foundation to daylight or a dry well. In areas with outages, a battery backup or secondary pump keeps the system moving.
Insulation and air sealing that hold up
Fiberglass batts sag when they see moisture. Rigid foam on the walls performs better because it sheds water and keeps interior surfaces warmer. Sealing the rim joist cuts air leaks and stops condensation at a common cold spot.
Health and comfort
A large share of first-floor air can originate in the crawl. Drying the crawl reduces the conditions mold needs and helps hold indoor RH under 60%. Many homeowners notice fewer musty odors and more stable floors after the space is sealed and drained.
Our approach
We inspect the crawl, trace water paths, and check grading and downspouts. If exterior fixes are needed, we handle those first. Then we install the interior drain and sump, encapsulate floors and walls with a reinforced liner, seal vents and the rim, add wall foam where it makes sense, and set up controlled drying. We leave clear service access and simple maintenance steps.
Maintenance and targets
Plan a quick check at the start of each wet season: confirm the discharge is clear, test the pump, empty the dehumidifier’s filter tray, and spot-check seams and tape. Aim for crawl space RH under 60% through summer.
FAQ
Do I still need a dehumidifier after encapsulation?
Often, yes. Encapsulation cuts vapor and air leaks; a dehumidifier trims what’s left and keeps the RH target.
Will this help with odors upstairs?
Drying the crawl reduces the musty air pulled up by stack effect. Many homes see cleaner smells once RH is controlled.
Is exterior waterproofing required?
Not always. Many homes dry out fully with an interior drain, sump, and encapsulation. If grading or gutters are failing, we address those too.
How long does the work take?
Most projects fit inside a few working days, depending on size and access.
Ready to dry out your crawl space the right way? Book a free estimate and we will lay out a plan that fits your home and budget.