Hear from Our Customers
You stop worrying every time rain hits the forecast. Your basement smells normal again, not like mildew or damp concrete. The air feels cleaner because mold isn’t growing behind your walls or under your carpet.
Your energy bills drop because wet insulation isn’t forcing your HVAC system to work overtime. You can actually use your basement for storage, a home gym, or extra living space without wondering if everything down there is going to get ruined.
And when it’s time to sell, you’ve got documentation and a transferable warranty that tells buyers this house was protected the right way. That’s what proper waterproofing does—it removes the problem and everything that comes with it.
Del Val Basement Waterproofing is a family-run waterproofing contractor based in Plymouth Meeting, serving homeowners throughout Lionville, PA and the surrounding Delaware Valley. We know what Pennsylvania weather does to foundations—freeze-thaw cycles, spring snowmelt, summer downpours, high water tables.
Lionville sits in an area where older homes have stone foundations and newer construction deals with clay-heavy soil. Both create water problems, just in different ways. We’ve seen it all, and we know how to fix it correctly the first time.
Every job we do comes with a lifetime transferable warranty. That’s not marketing language—it’s a real guarantee that protects your investment and adds value when you sell.
First, we come out and inspect your basement for free. We’re looking at where water’s coming in, what’s causing it, and what’s happening with your foundation, drainage, and grading. We don’t guess—we find the actual source.
Then we explain what we found in plain terms and walk you through the fix. That might mean interior drainage with a sump pump system, exterior waterproofing, foundation crack repair, or a combination depending on your situation. Every solution is custom-designed for your property, not a one-size-fits-all approach.
Once you approve the plan, our crew handles the install. We’re talking proper excavation if needed, drainage systems that actually move water away from your foundation, sump pumps positioned where they’ll do the most good, and waterproof barriers that hold up long-term. When we’re done, we clean up, walk you through the system, and back it with that lifetime warranty.
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You’re getting a full assessment of your basement and foundation, not just a quick look at the obvious wet spot. We identify hydrostatic pressure issues, drainage failures, foundation cracks, and any structural concerns that need attention.
The work itself covers interior drainage systems, exterior waterproofing, sump pump installation and backup systems, foundation crack repair, crawl space encapsulation, and exterior drainage solutions like catch basins and concrete drains. We also handle mold remediation when moisture has already caused growth.
In Lionville, PA, we see a lot of basement water damage after heavy spring rains when the ground is saturated and can’t absorb more water. We also see problems from aging foundations—homes that have been through 20+ Pennsylvania winters and are showing cracks from freeze-thaw cycles. Our solutions address both the immediate water intrusion and the underlying cause so you’re not dealing with this again in two years.
Most basement waterproofing projects in Lionville, PA run between $3,000 and $10,000 depending on the size of your basement, the severity of the water problem, and what kind of system you need. A straightforward interior drainage system with a sump pump is going to cost less than full exterior excavation and waterproofing.
The national average for water damage restoration is between $1,322 and $5,954, and that’s just cleanup—not prevention. If you’re already dealing with repeated flooding, you’re spending money on cleanup and repairs every time it happens. Waterproofing stops that cycle.
We offer free inspections so we can give you an accurate estimate based on your specific situation. We also run promotions—right now, you can get 15% off or up to $1,000 off basement waterproofing. The investment protects your foundation, your health, and your property value. And with our lifetime transferable warranty, it’s a one-time fix.
Water follows the path of least resistance, and when the ground around your foundation is saturated, that path leads straight into your basement. In Lionville, PA, we get 40-50 inches of rain annually, and spring is especially rough when snowmelt combines with rain and the ground is still partially frozen.
If your gutters are clogged or your downspouts dump water right next to your foundation, that’s a problem. If the grading around your house slopes toward the foundation instead of away from it, water pools against your walls. If you’ve got cracks in your foundation—and most homes over 20 years old do—water finds its way in through hydrostatic pressure.
Clay-heavy soil, which is common in Chester County, doesn’t drain well. It holds water, and that water puts constant pressure on your foundation walls. Over time, that pressure causes cracks, bowing, and leaks. A proper waterproofing system addresses drainage, repairs foundation issues, and installs barriers that keep water out even when the ground is soaked.
A professionally installed waterproofing system should last decades—20 to 30 years or more if it’s done right. That’s why we back our work with a lifetime transferable warranty. We’re not installing temporary fixes that fail after a few years.
The longevity depends on the quality of materials and installation. Cheap sump pumps burn out. Poorly installed drainage systems clog or shift. Exterior waterproofing membranes that aren’t applied correctly fail when they’re needed most. We use commercial-grade materials and install them according to manufacturer specs and industry best practices.
Your system does need occasional maintenance—sump pumps should be tested annually, and drainage systems should be inspected to make sure they’re clear. But the core waterproofing work shouldn’t need replacement or major repairs if it’s done correctly from the start. That’s the difference between a real solution and a bandaid.
You can handle minor moisture issues with a dehumidifier or by fixing gutter drainage, but actual waterproofing—the kind that stops flooding and protects your foundation—requires professional equipment, materials, and expertise. DIY sealants you paint on walls don’t stop hydrostatic pressure. They might hide the problem temporarily, but water will find another way in.
Installing an interior drainage system means breaking up your basement floor, installing perforated pipe in a gravel bed, connecting it to a sump pump basin, and making sure everything slopes correctly so water flows where it’s supposed to. Exterior waterproofing means excavating around your foundation, repairing cracks, applying waterproof membrane, and installing drainage tile. These aren’t weekend projects.
In Lionville, PA, you’re also dealing with local soil conditions, water table levels, and building codes. A professional waterproofing contractor knows how to assess your specific situation and design a system that actually works. And if something goes wrong with a DIY job, you’re paying twice—once for materials and your time, and again to have it fixed correctly.
Interior waterproofing manages water that’s already made it through your foundation. We install a drainage system along the inside perimeter of your basement floor that collects water and channels it to a sump pump, which then pumps it out and away from your house. This is less invasive and more affordable than exterior work, and it’s highly effective for most situations.
Exterior waterproofing stops water before it reaches your foundation walls. This involves excavating around the outside of your foundation, repairing any cracks or damage, applying a waterproof membrane or coating, and installing drainage tile at the footer level. It’s more comprehensive and handles severe water pressure issues, but it’s also more expensive and disruptive.
Sometimes you need both. If your foundation has structural cracks or significant bowing, exterior work might be necessary to repair and protect the walls. If you’re dealing with high water tables or severe drainage issues, exterior solutions give you better long-term protection. We assess your situation during the free inspection and recommend what makes sense for your home and budget.
Waterproofing stops the moisture that causes mold and that musty smell, but if you already have mold growth, you need remediation before or during the waterproofing process. Mold grows when relative humidity stays above 60% and there’s an organic material for it to feed on—drywall, wood, carpet, insulation.
Once we stop water from coming in, humidity levels drop and mold can’t continue growing. But existing mold doesn’t just disappear. It needs to be removed properly, which means identifying all affected areas (including behind walls and under flooring), removing contaminated materials, treating surfaces, and improving ventilation.
We handle mold remediation as part of comprehensive basement waterproofing in Lionville, PA. The goal is to eliminate the water source, remove existing mold, and create an environment where it can’t come back. That also means better indoor air quality, which matters if anyone in your house deals with allergies, asthma, or respiratory issues. The musty smell goes away when the moisture and mold are gone—not before.
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