Lagging

Lagging is the finishing material (such as steel, aluminum, or other materials) used to cover many types of insulation, especially on large flat surfaces such as boiler walls, flues, ducts, precipitators, selective catalytic reduction systems, baghouses, wind boxes or fans. Insulation and metal lagging of mechanical system components including flat work, round work, pressure vessels and specialty components.  Also known as cladding or sheet metal, lagging ranges in thickness from .016-inch to .063-inch and usually does not include a vapor barrier.

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