​David Guinan


Mr Guinan earned a degree from Villanova University in Communication Studies, Marketing & Finance with a minor in Psychology.  David has been with the firm for 5 years and is accountable for the administrative, financial, and risk management operations of the company, which includes the development of a financial and operational strategy, metrics, and the ongoing development and monitoring of control systems designed to preserve company assets and report accurate financial results. David also guides and manages the overall provision of Human Resources services, policies, and programs for the entire organization. 

James J. Guinan IV


13 years with the firm. Mr. Guinan has extensive experience in waterproofing, masonry restoration, concrete rehabilitation and 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, and continued through, now serving as Chief Operating Officer of the company.  James is fully involved in all aspects of the business, and currently oversees the day-to-day operations. James currently holds several certifications, such as: OSHA Scaffold Industries of America, Safeway Scaffolding, Sikalastic RoofPro, Confined Space, and First Aid/Life Support.  James serves on the Board of Directors within The International Concrete Repair Institute and maintains active involvement within several other industry trades associations.

Joshua Steward


Mr. Steward contributes his extensive knowledge in building construction, specializing in sealants, coatings, bricklaying, waterproofing, masonry restoration, 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 industry related courses and hands-on training seminars. Josh is a certified mold technician and certified in Sikalastic RoofPro. 

Contact  info

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.

About Us

Kristin Guinan 


Miss Guinan earned a degree from West Chester University in Communication Studies. Kristin recently joined the firm following a stellar 15-year career providing products/services to every facet of real estate. Kristin is very well known for a natural and genuine ability to develop and cultivate professional relationships with colleagues and clients alike.  She is a prominent and proven leader to peers as demonstrated by her election as 2017 President of the PA East Apartment Association Associates Council.  A strong advocate for
commitment and dedication, Kristin has served on multiple industry boards including, the DE Apartment Association and Institute of Real Estate Managers. Kristin is always the first to volunteer for a charity or industry program, always focusing on the greater good.  Her efforts have been recognized multiple times by industry professionals, receiving top honors including; Member of the Year, Best Sales Person & Best Industry Involvement.

144 Fairville Rd - Suite A2

Chadds Ford PA 19317


Fax 484.887.1652


Our Team

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 95% repeat business. We strive to make certain that the restoration work is accomplished in a timely manner.