Family-owned since 1976. The owner is on every job. No salesmen. No subcontractors. Just nearly 50 years of hands-on expertise backed by a lifetime transferable guarantee.
Quick estimates, zero obligation. Just enter your zip and we'll take it from there.
No pressure. No gimmicks. Just honest waterproofing from the owner himself.
Call or fill out the form. A.J. DiElsi will come to your home personally — no salesmen.
A.J. inspects your basement, diagnoses the problem, and provides an honest quote on the spot.
Our crew completes the job with meticulous care. Backed by a lifetime transferable guarantee.
Don't wait for minor issues to become major problems. These are the warning signs that your basement needs professional attention.
Water seeping through walls, floor cracks, or window wells threatens your foundation and belongings.
Moisture creates the perfect breeding ground for mold, risking your family's health and indoor air quality.
Excess moisture in your basement rises through your home, causing discomfort and damage everywhere.
That damp, musty smell isn't just unpleasant — it signals active moisture problems that will worsen over time.
Unresolved water issues can reduce your home's value by 10-25%. Buyers walk away from wet basements.
Water pressure against walls causes cracks, bowing, and structural compromise that gets exponentially worse.
Our waterproofing professionals assess your specific needs and design a solution that fits your budget and ensures lasting protection.
Complete interior and exterior waterproofing systems to keep your basement permanently dry.
Professional drainage systems that redirect water away from your foundation for good.
Installation, repair, and backup systems to protect against flooding.
Custom grading and drainage solutions to eliminate standing water in your yard.
Encapsulation, structural repair, and moisture control for a solid foundation.
This guy really knows his stuff. His workers are extremely well-trained, polite and diligent. They did an incredible job and left the place spotless.
The owner spent over an hour and a half explaining issues and options. It was very apparent he is a true professional. Outstanding service.
Called in an emergency with a flooded basement. AJ and his crew fixed it and helped us with so many things around the house. Can't thank them enough!
AJ came out personally, diagnosed the issue in minutes, and had a crew here the next day. No high-pressure sales, just honest advice. Our basement has been bone dry ever since.
We got three quotes and AJ was the most thorough by far. He explained everything, never rushed us, and the price was very fair. The work speaks for itself.
Had water coming in every time it rained. AJ installed a French drain and sump pump and we haven't had a drop of water since. Lifetime warranty gives us total peace of mind.
Nearly 50 years of family-owned excellence. Here's what sets us apart from every other waterproofing company.
Written, transferable lifetime warranty on every job for total peace of mind.
The owner personally oversees every project to ensure quality and accountability.
Interior and exterior waterproofing, basement flood repair, and full drainage solutions.
Skilled professionals with meticulous workmanship and attention to detail.
Convenient financing options with payment plans available up to 60 months.
A proud local business rooted in the community for over 50 years.
Fair pricing and highly recommended by satisfied homeowners.
We respect your home and leave your space cleaner than we found it.
Don't let cost stop you from protecting your home.
No obligation. The owner will personally assess your home and provide an honest estimate.
Get a Free QuoteWhen you work with A.J. Waterproofing, you're our priority.
Founded — Nearly 50 Years of Service
Counties Served Across PA
Star Rating — 153 Reviews
Owner-Operated Since Day One
Everything you need to know about our waterproofing services.
Most jobs are completed in 1-3 days depending on the scope. A.J. and his crew start and finish one job at a time, so your project gets their full attention.
Our written, transferable guarantee covers all French drain installations and waterproofing work for the lifetime of your home. If you sell your house, the guarantee transfers to the new owner.
Yes — A.J. DiElsi personally visits your home, diagnoses the water problem, and provides an honest quote at no charge. There's never any obligation or deposit required.
We serve Montgomery, Chester, Delaware, and Bucks Counties — including Collegeville, West Chester, Norristown, Exton, Bryn Mawr, and Doylestown. We also travel out of state for referrals.
With us, the owner is on every job — no salesmen, no subcontractors, no multiple crews. You get nearly 50 years of hands-on expertise, meticulous workmanship, and a lifetime guarantee. Our business is built entirely on referrals from satisfied customers.
Tell us about your project and we'll get back to you fast.
Don't settle for temporary fixes. A.J. Waterproofing provides comprehensive solutions that protect your home from water damage, mold, and structural issues for a lifetime.
Every project is personally overseen by A.J. DiElsi — no salesmen, no subcontractors, no surprises.
Service Areas: All of Montgomery County, Bucks County, Chester County, Delaware County, and surrounding areas.
Services: Basement Waterproofing, French Drain Installation, Sump Pump Services, Foundation Waterproofing, Crawl Space Repair, Yard & Storm Drainage.
Get your free, no-obligation estimate today. The owner will personally assess your home.