Duramax sheds and garages, manufactured by US Polymers INC., have a building to fit any storage need you have for the back yard or shop. Vinyl or metal, sheds, garages, or insulated buildings, they all have that durable Duramax reputation. Â Duramax buildings come with a 10 to 15 year limited warranty. As an authorized dealer we can answer all your questions and help you get the perfect choice delivered to you. Order yours today!