Interior Trench Drain Systems
A perimeter French drain collects water entering through walls and soil, then channels it to the sump basin instead of letting it pool under your home.
Interior drainage systems, sump pumps and exterior water management that stop water intrusion, flooding and standing water under your home.
When water keeps finding its way into your crawlspace, sealing alone won't fix it. We design and install complete drainage systems that move water out and keep it out — protecting your framing, insulation and air quality.
A wet crawlspace is almost always a drainage problem. Water finds its way under your home through the foundation walls, up through the soil, or down from poorly directed gutters and a yard that slopes the wrong way. Once it's there, it sits — soaking the ground, raising humidity, and feeding mold and wood rot.
In Spartanburg and across the Upstate, heavy clay soil and sudden downpours make this worse. The clay holds water against your foundation instead of letting it drain away, so every storm pushes more moisture toward the crawlspace. Sealing the space with a vapor barrier or encapsulation won't help if water keeps arriving — it just traps the puddles on top of the plastic.
Our crawlspace drainage solutions fix the root cause. We collect the water that gets in with interior trench drain systems, pump it out with a properly sized sump pump, and reduce how much water reaches your home in the first place with downspout extensions and yard drainage improvements. The result is a dry crawlspace, protected framing and insulation, and the end of musty odors and high humidity.
Drainage isn't one product — it's a system of interior and exterior fixes working together.
A perimeter French drain collects water entering through walls and soil, then channels it to the sump basin instead of letting it pool under your home.
A correctly sized sump pump in a sealed basin removes collected water and discharges it safely away from the foundation — even during the heaviest storms.
Gutter water dumped at the foundation is a leading cause of wet crawlspaces. We carry it well away from the home so it can't seep back down.
Re-grading and surface drainage direct rainwater away from your foundation, reducing how much water ever reaches the crawlspace.
If any of these sound familiar, water is getting into your crawlspace and needs somewhere to go.
Most wet crawlspaces in the Upstate come down to a handful of causes — usually more than one at once.
Poor exterior grading. When the ground slopes toward your home instead of away, rainwater runs straight to the foundation and soaks down into the crawlspace.
Gutters and downspouts dumping at the foundation. A single downspout can pour hundreds of gallons right beside your footing during one storm. Without extensions, that water has nowhere to go but down.
Heavy clay soil. Spartanburg's red-clay soil holds water against the foundation rather than draining it, building hydrostatic pressure that pushes moisture through walls and up through the ground.
A high water table or seasonal springs. In low-lying lots, groundwater can rise into the crawlspace during wet months, causing standing water issues that never fully dry out.
Foundation wall cracks and porous block. Even hairline gaps let water seep in under pressure, leaving the telltale stains and damp soil that signal an active intrusion.
Every drainage project starts with a free, honest inspection — not a sales pitch.
We trace where water enters, check grading and gutters, and measure moisture so the system is designed for your home, not a template.
An interior trench drain is cut into the perimeter, filled with gravel and perforated pipe, and routed to a low point inside the crawlspace.
A sump basin and properly sized pump collect that water and discharge it safely away from the foundation, even during heavy rain.
Downspout extensions and yard drainage improvements cut the amount of water that ever reaches your home, so the system rarely has to work hard.
If your crawlspace has active water intrusion, drainage should always be completed before encapsulation. Here's why: crawlspace encapsulation seals the space with a heavy-duty liner, but the liner only blocks vapor — it doesn't move liquid water. If water keeps coming in after the space is sealed, it collects on top of the new vapor barrier and undoes the whole investment.
The correct sequence is to manage the water first with an interior trench drain and sump pump, fix the exterior causes with downspout extensions and yard drainage, and only then seal the crawlspace. With a dry, drained foundation underneath, encapsulation and a vapor barrier installation can do their job for years, and a dehumidifier installation can hold humidity low without fighting a constant water source.
Already sealed but still seeing moisture? Drainage can still be added, and our JHS Crawlspace Maintenance Program keeps the whole system performing with regular inspections and moisture checks. Planning a full project? Review our guide to crawlspace encapsulation cost in Spartanburg, SC to understand how drainage fits into the budget.
Straight answers to what Upstate homeowners ask us most.
Drainage works hand-in-hand with the rest of a healthy crawlspace system.
Local, in-person crawlspace drainage service across Spartanburg County and beyond.
JHS Crawlspace Specialist provides crawlspace drainage solutions throughout Spartanburg and the surrounding Upstate, including Boiling Springs, Inman, Duncan, Moore, Roebuck, Woodruff, Chesnee, Cowpens, Pacolet, Pauline, Campobello, Arcadia, Fairforest, Una, Wellford, Landrum, Lyman, Reidville, Greer, and the rest of the surrounding Upstate South Carolina communities.
If your home sits on red-clay soil and you're dealing with a wet, flooding or musty crawlspace, we're nearby and ready to take a look. See all of our service areas or reach out for a free inspection.
Honest work, clear communication, and results homeowners actually notice.
Schedule your free crawlspace inspection today — we'll find where the water's coming from and show you exactly how to stop it. No pressure, no scare tactics.