ANSI A42.4

Description / Abstract: This standard specifies minimum requirements for interior lathing and furring. The use of equivalents or better is permissible.

Where a specific degree of fire resistance is required for plastered assemblies and constructions, applicable building code regulations shall be followed. Details of construction to achieve required fire resistance may be obtained from official reports of fire tests conducted at recognized fire testing laboratories in accordance with USA Standard Methods of Fire Tests of Building Construction and Materials, A2.1-1956 (ASTM E 119 - 55).¹

To secure desirable results, this standard should be coordinated with USA Standard Specifications for Gypsum Plastering, A42.1-1964, and with Chapter 11 of USA Standard Specifications for Portland Cement Plastering, A42.3-1946.

General information regarding matters of a contractural nature concerning lathing and furring will be found in Appendix A. Additional technical information rclatcd to lathing and furring materials is provided in Appendix B. Erection data for door frames installed in lath and plaster hollow partitions using prefabricated steel stud or channel studs is provided in Appendix C. I.S When the following USA Standards referred to in this document are superseded by a revision approved by the United States of America Standards Institute, Inc., the revision shall apply:

USA Standard Methods of Fire Tests of Building Construction and Materials, A2.1-1956,

USA Standard Specifications for Portland Cement Plastering, A42.3-1946, and

USA Standard Specifications for Gypsum Plastering, A42.l-1964.