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About Us

Gag Sheet Metal, Inc. (GSM) has been in business since 1904. The company is a family-owned business based in New Ulm, MN, that serves Minnesota, Iowa, Wisconsin, North Dakota, and South Dakota. GSM is the oldest roofing and HVAC business in southern Minnesota, but their offerings go far beyond their humble roots. Today, GSM offers a wide array of products and services, including: Appliances, Kitchen & Bathroom Fixtures, Heating & Cooling, Plumbing, Commercial Flat Roofing, Architectural Sheet Metal And More! The company’s staff, installers and technicians possess industry knowledge and skills that set them apart from those of competitors. GSM team members strive to provide exceptional customer service and build life-long relationships.


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