Whether in need of a new roof or repair and maintenance of an existing roof, GSM is here to help. With over a century of expe ... rience passed down from generation to generation, GSM has the knowledge and skills to efficiently tackle your roofing project. Highly trained staff, installers and service technicians will work to ensure that your roof is sturdy, leak-proof and will last for years to come. GSM offers all types of roofing, with flat roofing and architectural panels as a specialty. GSM roofing services include: EPDM (Rubber) PVC Built Up (Asphalt) Metal Standing Seam Slate & Tile Roof Repair & Maintenance When looking for professional plumbing services for your business, look no further than GSM. Whether looking to install, replace, service or repair one of the many parts of your business’s plumbing, GSM has the skills to match. You can trust that GSM’s highly experienced, knowledgeable commercial plumbers will complete your project efficiently. read more