About BQ Basement Systems in the Delaware Valley BQ Basement Systems is owned and operated by Brian Quinn. The company is located at 525 Bethlehem Pike in Erdenheim, Pennsylvania. Since 2004 BQ Basement Systems has been one of the TOP 10 dealers out of 300 dealers in the entire Basement Systems Network. Our dedicated team of employees are experts in basement waterproofing and trained to identify and cure your wet basement or foundation problems once and for all. BQ Basement Systems also specializes in concrete repair, mold control, egress windows, and a broad range of additional home improvement services. Plus, our products are backed by a lifetime guarantee!