GRP Construction Services is a family-owned and -operated business, and we love helping our community. At first, the owners worked for another company for many years, but then decided to start their own business because of all of their experience. Today we are thriving and ready to serve you with more than 20 years of Experience. proyect manager and installers in Gaithersburg all have same goal- your 100% satisfaction, We do this by offering affordable roofing options, like a 10 percent discount on full roo.