ASTM WK45329

    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



    WK45329

    1. Rationale

    Testing for, and reporting of, Density for these products is no longer relevant because manufacturers do not report the density of their products, only weight/sq. ft. Recent introduction of lightweight versions of CBUs by three of the CBU manufacturers demonstrates this is no longer a relevant attribute and should be removed. This is a needless requirement in this standard that creates extra work and expense in compliance for manufacturers without providing identifiable benefits.


    Keywords

    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:
    03-07-2014

    Technical Contact:
    Keith Poerschke

    Item:
    004

    Ballot:
    C17 (14-01)

    Status:
    Negative Votes Need Resolution