Hear from Our Customers
You stop worrying every time rain hits the forecast. Your basement becomes usable space again—not a storage area you’re afraid to put anything valuable in.
The air in your home improves because you’re not dealing with that musty smell creeping upstairs. Your family isn’t exposed to mold spores that show up in damp basements across Paoli, PA.
Your property value holds. When it’s time to sell, buyers don’t walk away after seeing water stains or foundation cracks. You’re not scrambling to fix years of damage right before listing. The work is done, the warranty transfers, and your home shows well.
Del Val Basement Waterproofing is a family-run waterproofing contractor serving Paoli, PA and the Main Line. We know what Chester County soil does to foundations. We know how much rain you get here—more than most of the country.
We’ve installed thousands of systems, many recommended by structural engineers who’ve seen what works and what doesn’t. Our approach isn’t about selling you the most expensive option. It’s about installing what your specific basement needs based on how water is getting in.
We back our work with a lifetime transferable warranty because we’re not going anywhere. This is our area. These are our neighbors.
First, we come out and actually look at your basement. We’re checking where water enters, how your foundation is built, what your grading looks like, and whether you’ve got interior or exterior issues—or both.
Then we explain what’s happening and why. You’ll understand whether you need interior waterproofing with our sub-floor pressure relief system, exterior waterproofing with membrane installation, or a combination. We don’t upsell. We tell you what fixes the problem.
Once you approve the plan, we schedule the work. Most jobs don’t require you to leave your home. Yes, there’s some noise and dust, but you can still live normally. We install the system, test it, clean up, and walk you through what we did. You get documentation and your lifetime warranty in writing.
Ready to get started?
Interior waterproofing means we install a sub-floor pressure relief system—a proven alternative to French drains that often fail in Paoli’s clay-heavy soil. This system manages hydrostatic pressure before it cracks your foundation. We also apply sealants and install drainage that directs water away from your foundation walls.
Exterior waterproofing is more involved. We excavate around your foundation, install a waterproof membrane directly on the exterior walls, and upgrade your drainage system. This stops water before it ever reaches your basement. It’s the most thorough approach for homes with chronic water problems.
Both methods address the specific conditions in Paoli, PA—the soil composition, the above-average rainfall, and the seasonal freeze-thaw cycles that stress foundations. We’re not using generic solutions. We’re installing systems designed for what your home faces here.
Most homeowners in Paoli, PA spend between $3,372 and $7,830 for a complete waterproofing system, with the average around $5,381. That’s slightly higher than the national average because of our soil conditions and precipitation levels.
Interior waterproofing with drainage systems and sealants is the more budget-friendly option. Exterior waterproofing costs more because it requires excavation and membrane installation, but it’s also the most comprehensive fix for serious water problems.
The actual cost for your home depends on your basement size, the severity of your water issues, and whether you need interior work, exterior work, or both. We give you a clear estimate after we assess your specific situation—no surprises, no pressure.
Most waterproofing systems are designed to last the life of your home when installed correctly. Interior drainage systems can go decades without needing maintenance. Exterior membranes and properly installed drainage hold up for 30+ years in typical conditions.
The key is getting it done right the first time. That means using quality materials, installing systems that match your home’s specific water issues, and working with a waterproofing contractor who understands Paoli’s soil and weather patterns.
We back our installations with a lifetime transferable warranty. If something fails because of our workmanship or materials, we fix it. That warranty transfers if you sell, which tells you how confident we are in what we install.
Yes. Basement waterproofing is non-invasive enough that you don’t need to move out. You’ll hear noise when we’re working, and there will be some dust, but your daily routine doesn’t stop.
Interior work happens in your basement, so the rest of your home isn’t affected much. Exterior work means we’re digging around your foundation, which creates more disruption in your yard, but you’re still living upstairs normally.
Most jobs take a few days to a week depending on the scope. We clean up as we go and do a full cleanup when we’re done. You’re not left with a mess.
Paoli gets more rain than most of the country, and that water has to go somewhere. When your soil is saturated—which happens often here—hydrostatic pressure builds up against your foundation walls. That pressure finds any crack, gap, or weak point and pushes water through.
Chester County’s clay-heavy soil makes it worse. Clay doesn’t drain well, so water sits around your foundation longer. Add in freeze-thaw cycles that expand and contract your foundation, and you’ve got the perfect conditions for water intrusion.
Poor grading, clogged gutters, and aging drainage systems compound the problem. A lot of homes in Paoli were built before modern waterproofing standards, so they’re especially vulnerable. Fixing it means addressing the pressure, the drainage, and the entry points—not just patching cracks.
Yes, if you eliminate the moisture source. Mold needs water to grow. When your basement stays dry, mold doesn’t have what it needs to survive.
Basements in Paoli, PA are prime mold territory because they’re dark, often damp, and warm enough in summer to create ideal growing conditions. Once mold establishes itself, it spreads fast and affects your indoor air quality throughout the house. That’s when you start seeing respiratory issues, allergies, and that musty smell that won’t go away.
Waterproofing removes the moisture problem. No standing water, no damp walls, no condensation. You’re not just protecting your belongings and your foundation—you’re protecting your family’s health. And if you already have mold, waterproofing prevents it from coming back after remediation.
Interior waterproofing manages water after it’s already trying to get into your basement. We install drainage systems, sealants, and our sub-floor pressure relief system to control water and direct it away from your foundation. It’s effective, less expensive, and doesn’t require major excavation.
Exterior waterproofing stops water before it reaches your basement walls. We dig around your foundation, apply a waterproof membrane directly to the exterior, and install or upgrade drainage systems. It’s the most thorough approach and the best option for homes with serious, ongoing water problems.
Which one you need depends on your specific situation. Some homes only need interior work. Others need exterior. Many benefit from a combination. We assess your basement, explain what’s causing your water issues, and recommend the approach that actually solves your problem—not the one that costs the most.
Local Resources
Useful Links
Other Services we provide in Paoli
