Enercept Inc Enercept Structural Insulated Panels (SIPS) are manufactured in Watertown, SD. Enercept SIPS are made up of a solid expanded polystyrene (EPS) core sandwiched between two sheets of oriented strandboard (OSB). SIPS are used in the construction of residential, industrial, commercial and agricultural buildings. Enercept SIPS are energy efficient and 2 1/2 times stronger than conventional stick framing. Building with SIPS reduces on-site waste, and by combining framing, insulating and sheathing into one step, building with SIPS also reduces the amount of time needed to build your structure. For more information contact Enercept SIPS at 605- 882-2222.