What You Need, When You Need It The Glenrock Company has long been recognized as an industry leader in providing exceptional service and support to the professional specialty contractor. At Glenrock, the knowledge that we possess, the service that we provide, and the manufacturers that we represent, all combine to provide an exceptional experience for our customers serving the restoration, waterproofing and sealant markets. At Glenrock, we are all very proud of the rich tradition and reputation that we have created over the past six decades!