Delaware County, Pennsylvania was established in 1789 and —often referred to as “Delco” it is located just southwest of Philadelphia and is the only county to border both Delaware and New Jersey. It ranks fifth in the state in population but is the third smallest county in Pennsylvania.

It blends deep historical roots with modern residential, commercial, and industrial development, with its proximity to Philadelphia making it a key commuter hub, supported by an extensive network of highways and public transit.

The county offers a range of parks, trails and recreational spaces including the John Heinz National Wildlife Refuge known for protecting the largest remaining freshwater tidal marsh in Pennsylvania. 

Home to several colleges and universities, the county has a strong educational and cultural landscape. Economically, it features healthcare, education, and service industries as major employers, alongside a growing interest in redevelopment and innovation.
 

Tremco Roofing and Building Maintenance and our affiliated construction services company Weatherproofing Technologies, Inc. (WTI) provide industry-leading roofing and building envelope solutions to improve long-term performance and ROI.
 

Our team includes expert WTI Technicians who provide world-class diagnostics, repair, and maintenance services, and Field Advisors who are among the most highly trained roofing experts nationwide. Through advanced diagnostics, asset management programs, innovative roof restoration systems, and cooperative purchasing options, we can help you avoid emergency repairs, establish predictable budgets, and improve building performance to reduce facility lifecycle costs. Tremco Roofing and WTI are part of Tremco Construction Products Group.