ASTM C442/C442M-04e1 PDF

Full title and description

ASTM C442/C442M-04e1 — Standard Specification for Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board. This specification defines materials and minimum performance requirements for gypsum backing board used as a base in multilayer systems, as gypsum coreboard in semi-solid or solid partitions, and as shaftliner board in shaftwall assemblies.

Abstract

This withdrawn ASTM specification (2004, editorial change e1) established definition, dimensional and physical requirements (including hardness, nail‑pull resistance, and fire‑resistance designations such as Type X), and referenced application and test procedures for gypsum backing, core, and shaftliner boards used in wall and shaftwall systems. It provided both inch‑pound and SI units and cross‑referenced applicable test and application standards.

General information

• Status: Withdrawn (withdrawn 2005).
• Publication date: 2004 (Designation: C442/C442M-04e1; published January 1, 2004; editorial e1 change noted October 2004).
• Publisher: ASTM International (formerly ASTM Committee C11 jurisdiction).
• ICS / categories: Gypsum and related building materials — ICS 91.100.10 (Cement. Gypsum. Lime. Mortar).
• Edition / version: 2004, designation C442/C442M-04e1 (e1 = editorial change).
• Number of pages: 4 pages (concise specification).

Scope

The standard covered gypsum board products manufactured for use as backing board, coreboard, and shaftliner board. It specified intended end uses (base for multilayer systems, gypsum cores or studs in partitions, and shaftwall assemblies), required performance characteristics and referenced application procedures (for example, ASTM C840 for application). The specification established requirements in both inch‑pound and SI units and included editorial notes clarifying terminology such as fire‑resistance ratings.

Key topics and requirements

• Definitions and product types: backing board, coreboard, and shaftliner board (including Type X fire‑resistant designations).
• Dimensional and physical property requirements: specified thicknesses, edge conditions, and tolerances.
• Mechanical properties: hardness and nail‑pull resistance minimums and test procedures.
• Fire performance references: use of fire tests and fire‑resistance designations; referenced Test Methods E119 for assemblies where applicable.
• Application and installation guidance: cross‑reference to ASTM C840 for application procedures and system assembly notes.
• Units and measurement: both inch‑pound and SI units provided and treated independently.

Typical use and users

Spec writers, architects, building engineers, gypsum board manufacturers, product testing laboratories, and construction contractors used this specification to select and verify gypsum backing and shaftliner materials for partitions, multilayer wall systems, and shaftwall applications. It was also used as a reference in product development and in quality control testing by manufacturers and third‑party test labs.

Related standards

ASTM C442/C442M-04e1 has been withdrawn and its subject matter has been incorporated into later gypsum board standards. Key related and cross‑referenced standards include ASTM C1396/C1396M (gypsum wallboard, which later consolidated several gypsum board specifications), ASTM C840 (application of gypsum board), ASTM C472 (physical testing of gypsum products), and fire test standards such as ASTM E119. Other older or related gypsum board specifications (many withdrawn) are C630/C630M, C588/C588M, and C960/C960M.

Keywords

gypsum backing board; gypsum coreboard; shaftliner board; gypsum board; Type X; fire resistance; C442; C442M; gypsum partition; ASTM; C11 committee.

FAQ

Q: What is this standard?

A: ASTM C442/C442M-04e1 is a short ASTM specification that defined requirements for gypsum backing board, gypsum coreboard, and gypsum shaftliner board used in partitions, multilayer systems, and shaftwall assemblies. It was published in 2004 with an editorial e1 change.

Q: What does it cover?

A: It covered product types and intended uses, minimum dimensional and physical properties (hardness, nail‑pull resistance, thickness tolerances), fire‑resistance designations (including Type X where applicable), unit systems (inch‑pound and SI), and it referenced application and test procedures such as ASTM C840 and fire testing guidance.

Q: Who typically uses it?

A: Architects, specifiers, gypsum board manufacturers, test laboratories, and contractors historically used this specification to select or verify gypsum backing and shaftliner products for building assemblies. Specifiers now typically reference consolidated gypsum board standards.

Q: Is it current or superseded?

A: It is withdrawn (withdrawn in 2005). The content has been consolidated into later gypsum board standards such as ASTM C1396/C1396M and related documents; users should reference the current ASTM gypsum board standards for up‑to‑date requirements.

Q: Is it part of a series?

A: The standard was developed under ASTM Committee C11 (Gypsum and Related Building Materials and Systems) and was one of several gypsum board specifications; many of those have been consolidated over time into broader gypsum board standards (for example C1396/C1396M).

Q: What are the key keywords?

A: Gypsum backing board, gypsum coreboard, shaftliner, gypsum board, Type X, fire resistance, nail‑pull resistance, ASTM C442/C442M, C11.