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Polystyrene foam insulation and sheathing used in the construction and repair of residential and commercial buildings, recreational vehicles and manufactured housing; polystyrene foam used as underlayments and air infiltration barriers in residential and commercial building construction and repair; polystyrene foam used to protect waterproofing membranes in subsurface construction; polystyrene foam used as a separator and cushioning sheet or recovery board in construction and repair of roofs; polyethylene foam used as gasketing material in the construction and repair of residential and commercial buildings