Hear from Our Customers
You stop worrying every time rain’s in the forecast. No more moving boxes off the floor or running downstairs during storms to check for water.
Your basement becomes usable space again—not a liability. Finished basements stay finished. Storage areas stay dry. And if you ever sell, buyers won’t find water stains, musty smells, or cracks that kill deals.
Your energy bills drop because wet insulation stops dragging down your HVAC system. Your air quality improves because mold and mildew don’t get the moisture they need to grow. And your foundation stays structurally sound instead of slowly deteriorating from constant water pressure.
That’s what waterproofing actually does. It removes the problem at the source so you’re not constantly reacting to it.
Del Val Basement Waterproofing is a family-run waterproofing contractor in Upper Merion, PA, and we’ve spent over 15 years solving the exact problems you’re dealing with. We know how Upper Merion’s clay-heavy soil holds water. We know how the township’s drainage issues and aging infrastructure create basement flooding during heavy rain.
We’re not a national franchise following a script. We’re local, and we back our work with a lifetime transferable warranty—meaning if you sell your house, the warranty goes with it.
Our customers stay dry through spring downpours and snowmelt season. That’s the standard we hold ourselves to, and it’s why structural engineers recommend our Sub Floor Pressure Relief System across Montgomery County.
First, we come out and inspect your basement for free. We’re looking at where water’s entering, how your foundation’s handling pressure, what your grading and drainage look like, and whether you’ve got cracks, efflorescence, or other warning signs.
Then we explain what’s actually happening—not in technical jargon, but in plain terms. You’ll understand why water’s getting in and what needs to happen to stop it. We’ll recommend either interior waterproofing, exterior waterproofing, or both, depending on your situation.
Once you approve the plan, we install the system with minimal disruption to your routine. Most jobs wrap up in a few days. We use proven methods like our Sub Floor Pressure Relief System, which redirects water before it ever reaches your basement floor.
After installation, you get documentation, warranty details, and a system designed to work for decades without constant maintenance. And if anything ever comes up, we’re a phone call away.
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A real waterproofing company in Upper Merion, PA doesn’t just patch cracks and hope for the best. We address the root cause—whether that’s hydrostatic pressure, surface runoff, or foundation settlement.
Interior waterproofing includes installing drainage systems along the footer, sump pump installation or upgrades, and vapor barriers to control humidity. Exterior waterproofing means excavating around the foundation, applying waterproof membranes, installing drainage boards, and regrading soil to move water away from your home.
Upper Merion’s storm intensity has increased, and the township’s own reports show that existing pipes and culverts get overwhelmed, backing water into private property. That’s why we design systems that handle more than average rainfall—they’re built for the worst conditions, not just typical weather.
You also get a system designed specifically for Pennsylvania’s freeze-thaw cycles and clay soil composition. Cookie-cutter solutions don’t work here, and we don’t install them.
Most residential waterproofing projects in Upper Merion run between $3,000 and $10,000, depending on the size of your basement, the severity of the water problem, and whether you need interior or exterior work.
Interior-only jobs tend to cost less because there’s no excavation involved. Exterior waterproofing costs more upfront but addresses the problem from the outside, which is often the most effective long-term solution. If you need both, we’ll walk you through what makes sense for your situation and budget.
We provide free estimates with transparent pricing. No surprises, no upselling. You’ll know exactly what you’re paying for and why it’s necessary before any work starts.
A properly installed waterproofing system can last for decades—some systems last the entire life of the home without needing major repairs. That’s why we back our work with a lifetime transferable warranty.
The longevity depends on the quality of installation and the materials used. Cheap systems fail within a few years. Professional-grade systems with proper drainage, sump pumps, and exterior membranes keep working as long as your house stands.
Sump pumps may need occasional maintenance or replacement after 10-15 years, but the core drainage and waterproofing infrastructure stays intact. We install systems designed to handle Upper Merion’s soil conditions and weather patterns, so they’re built to last through Pennsylvania’s toughest seasons.
Upper Merion has specific conditions that make basement flooding common. The township’s streams are all classified as unhealthy by PADEP, and stormwater infrastructure gets overwhelmed during heavy rain, causing backups into private property.
Clay-heavy soil doesn’t absorb water well, so runoff pools around foundations. Many homes in Upper Merion were built decades ago, before modern waterproofing standards, which means foundations weren’t designed to handle today’s storm intensity. Add in freeze-thaw cycles that crack concrete, and you’ve got a perfect recipe for water intrusion.
Grading issues also play a role. If your yard slopes toward your house instead of away from it, every rainstorm sends water straight to your foundation. Fixing these issues requires more than a sump pump—it requires a system that manages water before it becomes a problem.
You can try, but most DIY waterproofing fails because it doesn’t address the actual source of the water. Painting on sealant or patching cracks might slow things down temporarily, but it won’t stop hydrostatic pressure or fix drainage problems.
Waterproofing requires understanding soil composition, water table levels, foundation construction, and drainage engineering. You need the right equipment to excavate, install drainage systems, and ensure everything’s graded correctly. Most homeowners don’t have access to that equipment or the experience to know what’s actually needed.
If you waterproof incorrectly, you can make the problem worse—trapping moisture inside walls, creating mold growth, or causing foundation damage that’s even more expensive to fix. A professional waterproofing contractor in Upper Merion, PA will assess your specific situation and install a system that actually works long-term.
Waterproofing stops the moisture that causes mold, but it won’t remove mold that’s already growing. If you have visible mold, you’ll need mold remediation before or after waterproofing—depending on the severity.
Once the waterproofing system is in place and your basement stays dry, new mold won’t grow. Mold needs moisture to survive, and a properly waterproofed basement eliminates that moisture source. Your air quality improves, and you stop dealing with the musty smell that comes with damp basements.
For Upper Merion homeowners, this matters because mold aggravates allergies and asthma, especially in kids. Stopping water intrusion is the only way to prevent mold from coming back after remediation. Surface-level fixes won’t cut it—you need a system that keeps your basement dry year-round.
Interior waterproofing manages water that’s already entered your basement. It uses drainage systems installed along the inside perimeter of your foundation, directing water to a sump pump that removes it before it floods your floor. It’s less invasive and costs less than exterior work.
Exterior waterproofing stops water before it reaches your foundation walls. It involves excavating around your home, applying waterproof membranes, installing drainage boards, and ensuring proper grading. It’s more comprehensive and handles the problem at the source, but it requires more labor and costs more upfront.
For many Upper Merion homes, a combination of both works best. Interior systems handle water that makes it through, while exterior work reduces the amount of water reaching your foundation in the first place. We’ll assess your situation and recommend what actually makes sense—not just what’s easiest to sell.
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