Hear from Our Customers
You stop worrying every time the forecast calls for rain. Your basement doesn’t smell like mildew anymore. You’re not dealing with puddles, stains, or that constant low-grade anxiety about what’s happening to your foundation while you’re at work.
The air quality improves because mold isn’t growing in the dark corners you can’t see. Your home value goes up instead of down. And if you ever decide to sell, you’re not scrambling to hide water damage or explain away that musty smell to buyers who notice everything.
This is what waterproofing actually does. It removes the problem so you can use your basement for storage, living space, or just peace of mind. No buckets. No backup plans. Just a dry space that stays that way.
Del Val Basement Waterproofing is a family-run waterproofing contractor that’s been serving Lansdale and Montgomery County for over 15 years. We’re not a national franchise. We live here, work here, and understand exactly why basements in this area flood.
Lansdale gets hit with heavy spring rains, summer storms, and the occasional flash flood. The older homes in North Penn Valley weren’t built with modern drainage systems. The soil composition and water table around here create hydrostatic pressure that most foundations weren’t designed to handle long-term.
We’ve seen it all. We know which solutions actually work and which ones are just temporary patches. And we back our work with a lifetime transferable warranty because we’re not going anywhere.
First, we come out for a free inspection. We’re looking at where the water’s coming in, what’s causing it, and what’s happening to your foundation because of it. We check for cracks, drainage issues, hydrostatic pressure, and any signs of structural stress.
Then we explain what we found in plain terms. No jargon. No upselling. Just what’s wrong and what it takes to fix it. We’ll walk you through interior options like our sub-floor pressure relief system, exterior waterproofing if that’s what your home needs, or a combination approach.
Once you’re ready to move forward, we schedule the work around your life. Most jobs take a few days. You can stay in your house the whole time. We’re not tearing your home apart.
After installation, we test everything, clean up completely, and show you exactly what we did. Then we hand you a lifetime warranty and stay available if you ever need us again.
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You’re getting a custom system designed for your specific foundation and water problem. We install interior drainage systems, sump pumps, vapor barriers, exterior excavation and waterproofing membranes, foundation crack repair, and crawl space encapsulation depending on what your home actually needs.
In Lansdale specifically, we see a lot of homes built in the 1950s through 1980s that are dealing with aging foundations and outdated or nonexistent drainage. Spring rains in March and April are brutal here. The average annual precipitation in Montgomery County ranges between 40 and 45 inches, and most of that hits during storm season when your basement is most vulnerable.
We also handle the structural side. If water damage has caused foundation settling, cracks in your brickwork, or separations around windows and doors, we fix that too. This isn’t just about keeping water out. It’s about making sure your home is stable and healthy for the long term.
Every system we install comes with that lifetime transferable warranty. If you sell, it transfers to the next owner. That’s worth about 30% more in resale value according to most local real estate professionals.
Most homeowners in Lansdale pay between $3,000 and $10,000 depending on the size of the basement, the severity of the water problem, and whether you need interior work, exterior work, or both. The Philadelphia area average sits around $5,400, but that’s just a baseline.
If you’ve got a straightforward interior drainage issue in a 1,000-square-foot basement, you’re probably on the lower end. If you need full exterior excavation, foundation crack repair, and a new sump system, you’ll be higher. We give free estimates so you know exactly what you’re looking at before we start.
Here’s the thing: waterproofing costs less than fixing the damage water causes. Foundation repairs, mold remediation, replacing rotted floor joists, and dealing with structural issues all cost significantly more. And they don’t stop the water from coming back.
Interior waterproofing manages water after it’s already entered the foundation walls. We install drainage systems along the perimeter of your basement floor, direct water to a sump pump, and push it out and away from your home. It’s less invasive, costs less, and works great for most situations.
Exterior waterproofing stops water before it ever reaches your foundation. We excavate around the outside of your home, apply a waterproof membrane to the foundation walls, install drainage tile, and backfill. It’s more comprehensive but also more expensive and disruptive.
In Lansdale, we usually recommend interior systems first unless there’s significant exterior foundation damage or the water table is unusually high. A lot of homes here have landscaping, driveways, or decks that make exterior excavation complicated. Interior systems are effective, reliable, and a lot easier on your property and your schedule.
A properly installed system lasts decades. Our sub-floor pressure relief systems are built to outlast your ownership of the home, which is why we back them with a lifetime warranty. Sump pumps typically last 7 to 10 years depending on how often they run, but those are easy to replace when the time comes.
The drainage systems themselves don’t wear out. They’re designed to handle water flow indefinitely. The membranes, sealants, and exterior coatings we use are commercial-grade and built for the long haul.
What matters more than lifespan is who installs it. A system installed wrong will fail in a few years no matter how good the materials are. We’ve been doing this since 2007, and we’ve seen plenty of bad work from fly-by-night contractors. That’s why we handle everything in-house and don’t subcontract the actual waterproofing work.
Waterproofing stops the moisture that causes mold, but it doesn’t remove mold that’s already there. You’ll need to address existing mold separately, either on your own or with a remediation specialist, depending on how bad it is.
Once the waterproofing system is in and your basement is dry, mold won’t come back. Mold needs moisture to grow. No moisture, no mold. You’ll also notice the air quality in your whole house improves because mold spores aren’t circulating up from the basement anymore.
In Lansdale’s humid climate, basements are mold magnets if they’re not properly sealed and drained. We see it constantly. The good news is that once you eliminate the water intrusion, the mold issue is solved for good. Just make sure you clean up what’s already there so you’re starting fresh.
You can try, but it’s not something we’d recommend unless you really know what you’re doing. Basement waterproofing isn’t like painting a room. If you misdiagnose the problem or install the system incorrectly, you’re just delaying the inevitable and probably making it worse.
Most DIY waterproofing involves sealing cracks or applying waterproof paint to the walls. That might slow things down temporarily, but it doesn’t address the root cause, which is almost always water pressure building up outside your foundation. You’re treating the symptom, not the problem.
Professional systems are designed to relieve that pressure and redirect water permanently. We’ve been called in to fix a lot of DIY jobs that failed after the first heavy rain. It ends up costing more in the long run because now you’re paying to undo the bad work and then do it right.
If your basement floods after we’ve waterproofed it, we come back and fix it at no charge. That’s what the lifetime warranty covers. We stand behind the work completely.
In 15+ years of doing this, we’ve had very few callbacks. When we do, it’s usually something like a sump pump that needs servicing or a discharge line that got clogged with debris. Those are quick fixes, and we handle them right away.
The systems we install are designed for the worst weather Lansdale can throw at them. Spring storms, summer downpours, rapid snowmelt—we account for all of it. If something fails, it’s on us to make it right. You shouldn’t have to live with water in your basement after paying for a permanent solution.
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