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You stop mopping up after every heavy rain. The musty smell disappears because moisture isn’t sitting in your walls anymore. Your basement becomes usable space again—not a storage area you avoid because it might flood.
Mold stops spreading through your home’s air. Your foundation quits shifting and cracking under hydrostatic pressure. You’re not wondering if the next storm will ruin your belongings or force you into a $15,000 emergency repair.
Lower Merion gets more rain than most areas, and your home’s foundation takes the hit. When water pools near your house, it finds every crack and weak point. We fix that—permanently—so you’re not dealing with the same problem twice.
Del Val is a family-run waterproofing contractor based in Montgomery County. We’ve completed thousands of jobs in Lower Merion and surrounding areas—everything from French drain installations to full foundation wall replacements.
We’re licensed, insured, and we back our work with a lifetime transferable warranty. That means if you sell your home, the warranty goes with it. Our inspectors are trained to identify the actual source of your water problem, not just sell you the most expensive fix.
Lower Merion homes deal with specific drainage challenges—sloped lots in Gladwyne, older foundations in Wynnewood, landscaping issues in Villanova. We know what works here because we’ve been doing this work in your neighborhood for over 15 years.
First, we inspect your basement and foundation to find where water is entering. We’re looking at cracks, hydrostatic pressure points, drainage patterns around your home, and how your gutters and grading are directing water. This tells us what’s failing and why.
Next, we explain what needs to happen. If you need exterior waterproofing, we excavate around your foundation, apply a Rubber Bituthene membrane, and install proper drainage. If interior waterproofing makes more sense, we install a French drain system and sump pump to redirect water before it enters your living space. Sometimes it’s both.
We also handle foundation crack repair using carbon fiber reinforcement or epoxy injection, depending on the severity. If you’ve got bowed walls, we stabilize them before water damage gets worse. Once the work is done, we test the system and walk you through the warranty. You’ll know exactly what’s covered and for how long.
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You get a full inspection with a written assessment of what’s causing your water problem. We don’t upsell—if a $2,000 fix solves it, we’re not pitching you a $10,000 system. Structural engineers recommend the methods we use, and everything is backed by our lifetime warranty.
Lower Merion homeowners pay an average of $3,609 for foundation repairs, but that number jumps fast if you wait. Minor cracks turn into structural issues. Small leaks become mold problems that affect your family’s health. We handle basement waterproofing, foundation repair, French drain installation, sump pump systems, mold removal, and exterior waterproofing—whatever it takes to keep water out.
You’re also getting a local company that answers the phone. We’re not a national franchise that subcontracts the work. We’re here in Montgomery County, and we’ll be here if you ever need us again. Most of our business comes from referrals because people in Lower Merion talk, and they remember who actually fixed their problem versus who just took their money.
Most basement waterproofing projects in Lower Merion run between $3,000 and $8,000, depending on what’s failing and how much work is needed. A straightforward interior French drain and sump pump system usually falls on the lower end. Full exterior waterproofing with excavation and membrane application costs more because it’s more labor-intensive.
If you’ve got foundation cracks, bowed walls, or structural issues, that adds to the cost. But here’s the thing—fixing it now is always cheaper than waiting. Minor problems turn into major ones fast, especially with the amount of rain Lower Merion gets. A $4,000 fix today can save you from a $15,000 emergency repair next year.
We give you a written estimate after the inspection, and we break down exactly what you’re paying for. No surprises, no upsells. You’ll know what the work costs and what’s covered under warranty before we start.
Water finds your basement because of poor drainage around your foundation, cracks in your walls or floor, or hydrostatic pressure pushing moisture through concrete. Lower Merion gets more rain than a lot of areas, and if your gutters aren’t directing water away from your house, it pools near your foundation and seeps in.
Older homes in Wynnewood and Villanova often have outdated or failing waterproofing systems. Foundations settle over time, creating cracks that let water through. Sloped lots in Gladwyne can channel runoff straight toward your home if landscaping isn’t graded correctly. Even new construction can have issues if the builder didn’t install proper drainage.
The musty smell you notice? That’s water vapor coming through your foundation walls. You might not see standing water, but moisture is there, and it’s creating mold. Fixing the root cause—whether it’s exterior drainage, interior waterproofing, or foundation repair—stops the problem for good.
A properly installed waterproofing system lasts decades. Our interior French drain and sump pump systems are built to handle heavy water flow for 20-30 years or more with minimal maintenance. Exterior waterproofing membranes like Rubber Bituthene are designed to last the life of your home when installed correctly.
The key is doing it right the first time. Cheap fixes fail because they don’t address the actual problem. If you just patch a crack without fixing the drainage issue causing it, the crack comes back. If you install a sump pump without a proper French drain system, water still seeps into your basement—it just doesn’t pool as much.
We back our work with a lifetime transferable warranty because we’re confident in what we install. You’re not going to need another waterproofing company in five years. The system works, or we come back and make it right. That’s the deal.
It depends on where the water is coming from and what your foundation needs. Exterior waterproofing stops water before it reaches your walls—we excavate around your foundation, apply a waterproof membrane, and install drainage to redirect water away. This is the most effective long-term solution, but it’s more expensive because of the excavation work.
Interior waterproofing manages water that’s already making its way in. We install a French drain system along the perimeter of your basement floor and a sump pump to collect and pump water out. This works well for homes where excavation isn’t practical or where the exterior foundation is still in good shape.
Sometimes you need both. If your foundation has structural cracks or bowed walls, we handle that first. Then we waterproof to prevent future damage. During the inspection, we’ll tell you what makes sense for your home. We’re not going to sell you exterior waterproofing if an interior system solves the problem.
Waterproofing stops the moisture that causes mold, but if you already have mold growth, that needs to be removed first. Mold spreads through airborne spores, and it thrives in damp environments. If your basement stays wet, mold will keep coming back no matter how many times you clean it.
We handle mold removal as part of the waterproofing process when needed. Once the mold is gone, we fix the water problem so it doesn’t return. That means sealing cracks, installing drainage systems, and making sure moisture can’t seep through your foundation walls. A dry basement doesn’t support mold growth.
Lower Merion’s humidity and rainfall create perfect conditions for mold if your basement isn’t properly waterproofed. The musty smell, the black spots on walls, the respiratory issues your family might be experiencing—all of that goes away when you eliminate the moisture source. Waterproofing isn’t just about keeping water out. It’s about making your home safe to live in.
If you’ve got cracks wider than a quarter-inch, bowed or leaning walls, or gaps between your walls and floor, you likely need foundation repair before waterproofing. These are signs of structural movement, and waterproofing alone won’t fix them. In fact, ignoring foundation issues makes them worse because water pressure keeps pushing against weakened areas.
Hairline cracks and minor seepage usually don’t require major foundation work. We can seal those cracks and install waterproofing to prevent future damage. But if your walls are bowing inward or you’re seeing stair-step cracks in your basement, that’s a structural problem that needs immediate attention.
During the inspection, we’ll tell you exactly what’s going on. We’re not going to recommend foundation repair if you don’t need it, and we’re not going to skip it if you do. Lower Merion homes—especially older ones—can develop foundation issues over time. Catching them early saves you money and prevents bigger problems down the road.
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