For over 35 years, Northern Waterproofing and Restoration has achieved an excellent reputation in the specialized masonry restoration business. In that time, we have achieved our success based on our strong commitment to quality service, dependability, performance, and the realization that the customer is the most important asset in our business.

Northern Waterproofing & Restoration serves the greater Philadelphia, New Jersey, Maryland and Northern Virginia areas. Northern's quality workmanship can be seen in industrial facilities, commercial properties and condominium complexes throughout the East coast.

Evidence of customer satisfaction can be found in our 85% repeat business. We strive to make certain that the restoration work is accomplished in a timely manner.

James J. Guinan IV


16 years with the firm. Mr. Guinan has extensive experience in waterproofing, masonry restoration, concrete rehabilitation & parking garage restoration. James is a former mechanic/ foreman with over 10 years of estimating experience. James began his journey with Northern as a Laborer. James currently holds several certifications, such as; OSHA Scaffold Industries of America, Safeway Scaffolding, Sikalastic RoofPro, Confined Space, and First Aid/Life Support. James is also on the board of Directors within International Concrete Repair Institute, and several other industry associations. 

Josh Steward


Mr. Steward contributes his extensive knowledge in building construction, specializing in sealants, coatings, bricklaying, waterproofing, masonry restoration, and concrete rehabilitation. Josh has been responsible for not only quality work and productivity, but also performing on site safety meetings to ensure the safety of all of our employees. Josh continues to increase his knowledge by attending on-going safety courses and hands-on training.  Josh is a certified mold technician and certified in Sikalastic RoofPro. 

About Us

Our Team

James J. Guinan III


Founder and president of the Northern Waterproofing firm. Mr. Guinan has worked for over 35 years in the construction/waterproofing trades. James has extensive experience in bricklaying, waterproofing, masonry restoration, concrete rehabilitation and historic recreation. A respected businessman and well-rounded member of the construction community, he is fully versed in every aspect of the company's business.

Contact  info

144 Fairville Rd - Suite A2

Chadds Ford PA 19317


Fax 484.887.1652