Applies to the installation of application of various types of acoustical or thermal insulating materials in buildings or within buildings. Applies only when the work is performed as a separate operation, not part of or incidental to any other construction operation performed by the same contractor at the same job or location. Refer to code 5020 for the installation of suspended acoustical grid-type ceiling installations, codes 5472 and 5473 for asbestos work, 5183 for boiler or steam pipe insulating and code 5551 for roofing.