ASTM WK45328

    Revision of C1325 - 08b Standard Specification for Non-Asbestos Fiber-Mat Reinforced Cementitious Backer Units

    (What is a Work Item?)

    Active Standard: C1325 - 14

    Developed by Subcommittee: C17.01 | Committee C17 | Contact Staff Manager


    1. Rationale

    Rationale: (Section 4) CBU classification- Current CBU manufacturers do not make separate products for interior and exterior application so this requirement should be removed. We are recommending that all products comply with the current exterior requirements and remove the requirement for labeling products as one or the other.


    acceptance; air cured; appearance; density; edge straightness; finish; flexural strength; glass mat cement sheet; inspection; interior wet area application; length and width tolerance; mechanical properties; minimum equilibrium strength; minimum wet strength; moisture content; moisture movement; nominal length; nominal thickness; nominal width; non-asbestos fiber-mat; packaging; physical properties; pressure cured; sampling; shipping; squareness tolerance; storage; supplementary requirements; supplementary tests; surface burning characteristics; thickness requirements; thickness tolerance; third party certification; tolerance; type tests; warm water resistance; workmanship; Cement materials/applications--specifications; Fiber-mat reinforced cement substrate sheets; Glass mat cement sheet; Nonasbestos fiber-cement materials--specifications; Substrate sheets;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Keith Poerschke

    Draft Under Development