Quick Water Management Tips

Rain Harvesting Fact

A 1,000 square foot roof sheds 623 gallons of rainwater from one inch of rainfall offering you the opportunity to collect thousands of gallons of “free” water for reuse in your garden.

Waterproofing Fact

Winter snow ground thaw and late winter rains can lead to higher ground water conditions, which can create foundation wall and below slab water infiltration.



Cosella-Dorken Recognizes National American Waterproofing

Every once in a while, we get to step back and see the progress we've made growing the business into one of the leading waterproofing companies in the northeast region. While we don't work for accolades, it sure is nice to occasionally get them. Here's the full text of a letter we received from one of our suppliers - Cosella-Dorken Products, Inc.

I would like to extend my gratitude and appreciation to National American Waterproofing for the outstanding workmanship conducted year-after-year as a Certified Installer of our DELTA®-MS waterproofing system for foundations. 

Thus far you have seamlessly installed over 1,500,000 square feet of DELTA®-MS; every one of your installations produced superior quality and attention to detail. National American Waterproofing is without a doubt a key component in our success in the market place. 

Thank you very much for all your great work!

Thank You.

With kind regards,


No problem, Chad! We look forward to many more years working together helping our clients alleviate their water issues.


Introducing Weather Resistant Barriers

National/American Waterproofing expands into the Weather Resistant Barrier (WRB) market.   The builder of this 10,000 square foot home in New Jersey contracted with us to install an above grade fluid applied WRB as an alternative to conventional housewrap products.   The membrane reduces air infiltration through the exterior walls providing a more comfortable and energy efficient home.   The fluid applied WRB protects the sheathing creating a more efficient and sustainable building envelope.  Despite harsh winter weather conditions, we completed this work in three days.


Repairing Foundation Wall Leaks

National/American was contracted to diagnose and provide a solution to a recurring foundation wall leak on a townhouse building in Central New Jersey. The repair was a turnkey operation from design, utility mark-outs, waterproofing and drainage repairs to excavation and backfilling. Working within a two-day weather window we repaired faulty waterproofing, removed a former repair,  replaced footing drains, sealed utility penetrations and reconfigured underground leader pipes. This precision excavation is a precursor to dozens of interior basement repairs.


Big Project. Big Waterproofing Needs in Philadelphia

At National/American Water Management, we’re involved in projects both big and small. This one? It’s a big one. We’re installing CETCO Voltex DS bentonite geotextile waterproofing system on a Toll Brothers City Living project in downtown Philadelphia. Our experience and efficiency enabled us to work on this fast-paced work site. The Voltex product is one of many waterproofing products we install on a daily basis on projects throughout the Tri-State area. If you’re in the planning stages of a similar development project and are looking for the best waterproofers in the business, please contact us.


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“I have tremendous respect for National/American Waterproofing and [owner] Bill Hoffman. The intangibles he brings to the job are limitless. He stands by his product, he stands by his crew, and he runs a tight ship. There’s nothing else I could ask for.”

-- Jeff Coe, Senior Project Manager