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Fire-Resistance Classifications of Building Constructions. Report of Subcommittee on Fire-Resistance Classifications of the Central Housing Committee on Research, Design, and Construction.


pdf icon Fire-Resistance Classifications of Building Constructions. Report of Subcommittee on Fire-Resistance Classifications of the Central Housing Committee on Research, Design, and Construction. (7783 K)
National Bureau of Standards

BMS 92; 72 p. October 7, 1942.

Keywords:

building construction; fire resistance rating; building design; fire hazard; building codes; combustible materials

Abstract:

A classification of building construction from the standpoint of fire safety is presented by a committee of representatives of Federal agencies concerned with the design, construction, and operation of buildings. By considering only the basic properties having a bearing on fire hazard and fire resistance, four types were found sufficient to cover the whole range of building construction. Within each type are two or more classes which are defined by the fire resistance required for their structural members. In Chapter 1 this classification is outlined and information given on how it can be applied with reference to the fire severity obtaining for given structural and occupancy conditions. Chapter 2 contains a discussion of the types of restrictions and limitations generally incorporated in building codes, with particular reference to their application to the classification of building types herein presented. Chapter 3 gives results of surveys of combustible contents of buildings housing typical occupancies as a basis for estimation of fire severity. In Chapter 4 are given available fire-resistance ratings of building constructions and fire-resistance classifications of roofing materials.