Sheet Metal & Air Conditioning Contractors’ National Association


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Accepted Industry Practices for Sheet Metal Lagging


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This document contains accepted industry practices for the fabrication and installation of sheet metal lagging, used to cover and protect insulated areas of equipment. The fabrication practices included illustrate the requirements of most commonly encountered insulated surfaces, such as boiler walls, flues, ducts, precipitators, air heaters, economizers, tanks, fans,etc.

This publication is intended to assist the designer, contractor and plant engineer in understanding and solving the complexities involved in the design, fabrication and installation of sheet metal lagging systems.