Finished basement flooded first heavy rain after we moved in. Two inches of water, ruined carpet, mold started within days. Expensive lesson in moisture problems.
Where Water Comes From
Two sources usually. Outside water pushing in – through cracks, foundation joints, hydrostatic pressure from saturated soil. Or inside humidity condensing on cold walls.
They need different solutions. Worth figuring out which you have.
The Outside-In Problem
Grading first. Ground should slope away from the house, at least an inch per foot for the first six feet. Most problems start with water pooling against the foundation.
Gutters and downspouts. Clean them. Extend downspouts far from the house – at least 4-6 feet, farther if you can. Underground extensions are even better.
Cracks get sealed from inside with hydraulic cement. Works for small stuff. Big cracks might need exterior excavation and waterproofing – that’s expensive.
Interior Drainage Systems
French drains around the interior perimeter. Catch water at the floor-wall joint, route it to a sump pump. Costs $5,000-15,000 usually. But works when exterior fixes aren’t enough.
Sump pumps need battery backups. Power goes out during storms when you need them most. Don’t skip this.
The Condensation Problem
Dehumidifier solves most of it. Get one sized for your space, let it run continuously. Set to 50% humidity or lower.
Improving air circulation helps too. Basements are naturally stagnant.
When to Call Pros
Serious water infiltration, structural cracks, persistent issues despite DIY fixes. Waterproofing companies can diagnose and quote solutions. Get multiple opinions – this industry has some shady operators.
