ASTM C842-05(2015)
Standard Specification for Application of Interior Gypsum Plaster

Standard No.

ASTM C842-05(2015)

Release Date

2005

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM C842-05(2021)

Latest

ASTM C842-05(2021)

Scope

1.1 This specification covers the minimum requirements for full-thickness (in accordance with Table 1) interior gypsum plastering on gypsum, metal, masonry, or monolithic concrete bases designed or prepared to receive gypsum plaster.

(A) Base coat plastering of the same proportions as specified for unit masonry is not prohibited from being used over plain or reinforced monolithic concrete, provided the surface is first covered with a metal plaster base or first coated with a bonding compound.

(B) Finish coat plaster applied direct to a bonding compound over vertical monolithic concrete shall be not more than8201;³/₁₆ in. (4.8 mm) in thickness. Where more than8201;³/₁₆ in. of finish coat is required to bring such vertical surface to a true plane, a base coat of plaster shall first be applied to the bonding compound.

(C) Where horizontal or vertical monolithic concrete surfaces require more than8201;³/₈ in. (9.5 mm) or8201;⁵/₈ in. (15.9 mm) of plaster, respectively, to produce required lines or surfaces, metal plaster base shall be attached to the concrete before application of plaster. Where concrete surface requires the application of more than 1 in. (25.4 mm) of plaster to produce required lines or surfaces, lath shall be applied over furring secured to the concrete.

^†8201;Typo corrected editorially October 2010.

1.1.1 Gypsum plaster applied to the interior side of exterior walls of masonry or concrete shall be isolated from the exterior wall.

1.2 Gypsum plasters shall not be used in exterior locations or interior “wet” areas.

Note 1: To secure desirable results, this specification should be coordinated with the provisions of Specification C841. General information concerning full thickness gypsum plastering is contained in Annex A2, Annex A3, and Annex A4.

1.3 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.

1.4 Details of construction to achieve required sound control shall be obtained from reports of tests conducted at recognized sound testing laboratories in accordance with the applicable sound tests of Test Methods E90, C423, or E492.

1.......

ASTM C842-05(2015) Referenced Document

• ASTM C11 Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• ASTM C1489 Standard Specification for Lime Putty for Structural Purposes
• ASTM C206 Standard Specification for Finishing Hydrated Lime
• ASTM C28/C28M Standard Specification for Gypsum Plasters
• ASTM C35 Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster
• ASTM C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
• ASTM C5 Standard Specification for Quicklime for Structural Purposes
• ASTM C59/C59M Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
• ASTM C61/C61M Standard Specification for Gypsum Keene's Cement
• ASTM C631 Standard Specification for Bonding Compounds for Interior Gypsum Plastering
• ASTM C841 Standard Specification for Installation of Interior Lathing and Furring
• ASTM E492 Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine
• ASTM E90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements

ASTM C842-05(2015) history

• 2021 ASTM C842-05(2021) Standard Specification for Application of Interior Gypsum Plaster
• 2005 ASTM C842-05(2015) Standard Specification for Application of Interior Gypsum Plaster
• 2005 ASTM C842-05(2010)e1 Standard Specification for Application of Interior Gypsum Plaster
• 2005 ASTM C842-05 Standard Specification for Application of Interior Gypsum Plaster
• 1999 ASTM C842-99 Standard Specification for Application of Interior Gypsum Plaster