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ASTM C1325-22e1

Current Revision

Standard Specification for Fiber-Mat Reinforced Cementitious Backer Units

$69.00

$69.00

$124.20


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1.1 This specification covers non-asbestos fiber-mat reinforced cementitious backer units manufactured to be dimensionally stable and suitable as either an unfinished substrate (see Note 1) or as a substrate for decoration such as natural stone or tile on walls, floors, or decks in wet and dry areas. It is also suitable to be used as a substrate in the Application of Class PB Exterior Insulation Finish Systems (Practice C1397), the Application of Direct-Applied Finish Systems (Practice C1516), and the Application of Exterior Insulation Finish Systems Class PI (Practice C1535).

Note 1: When used as an unfinished substrate, consult the manufacturer's written installation literature for proper application details.

1.2 This specification is not applicable to asbestos-cement flat sheets (Specification C220); non-asbestos fiber-cement flat sheets for exterior applications such as claddings, facades, curtain walls, and soffits (Specification C1186); gypsum backing board, coreboard, and shaftliner (Specification C1396/C1396M); water-resistant gypsum backing board (Specification C1396/C1396M); glass mat gypsum backing board (Specification C1178/C1178M); particle boards (Definitions D1554); and discrete non-asbestos fiber-cement interior substrate sheets (Specification C1288).

1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


This specification covers non-asbestos fiber-mat reinforced cementitious backer units manufactured to be dimensionally stable and suitable as either an unfinished substrate or as a substrate for decoration such as natural stone or tile on walls, floors, or decks in wet and dry areas. Flat sheets covered by this specification are divided into two types, according to their intended application: type A - sheets are intended for exterior applications as a substrate for other cladding materials, or as an unfinished substrate for decoration such as natural stone, tile, or coatings, and type B - Sheets are intended for covered exterior applications such as soffit areas, or for interior dry or wet area applications as a desired unfinished substrate or an unfinished substrate for decoration such as natural stone or tile, where substrate dimensional stability is required. These products are formed either with or without pressure and cured, either under natural or accelerated conditions, to meet the property requirements. Mechanical and physical properties shall be determined on an uncoated product wherever practical. The flexural strength, density value, and modulus of elasticity value shall be tested to meet the requirements prescribed.


SDO ASTM: ASTM International
Document Number C1325
Publication Date June 15, 2022
Language en - English
Page Count 5
Revision Level 22e1
Supercedes
Committee C17.01
Publish Date Document Id Type View
June 15, 2022 C1325-22E01 Revision
June 15, 2022 C1325-22 Revision
July 1, 2021 C1325-21 Revision
Aug. 1, 2019 C1325-19 Revision
July 1, 2018 C1325-18 Revision
June 1, 2017 C1325-17A Revision
Jan. 1, 2017 C1325-17 Revision
Aug. 15, 2014 C1325-14 Revision
Dec. 1, 2008 C1325-08B Revision
Nov. 1, 2008 C1325-08A Revision
March 1, 2008 C1325-08 Revision
March 1, 2004 C1325-04 Revision
Nov. 10, 1999 C1325-99 Revision