ASTM WK25757

    Work Item: ASTM WK25757 - Revision of C1063 - 08 Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster

    (What is a Work Item?)

    Active Standard: C1063 - 14a

    Developed by Subcommittee: C11.03 | Committee C11 | Contact Staff Manager



    1. Rationale

    Multi-item ballot items with the following rationale for change: RationaleFor wire laths, it is impossible for a inch staple to engage three strands. Further, some wire laths are designed for staple applications to engage only one wire. Therefore, the language needs to be changed to differentiate between lath types and exclude wire laths from this requirement. For wire laths, it is impossible for a screw to engage three strands. Therefore, the language needs to be changed to differentiate between lath types and exclude wire laths from this requirement. For wire laths, it is preferable to drive the fasteners flush as stated in 7.10.2.2. If the expanded metal industry feels that the requirement of not flattening ribs for their products is required, then the language needs to be changed so that wire rib laths are excluded and applies only to expanded metal rib laths. For wire laths, it is difficult for a common nail to engage three strands of lath. Therefore, the language needs to be changed to differentiate between lath types and exclude wire laths from this requirement. For wire laths, it is impossible for a screw to engage three strands. Therefore, the language needs to be changed to differentiate between lath types and exclude wire laths from this requirement. For wire laths, it is preferable to drive the fasteners flush as stated in 7.10.2.2. If the expanded metal industry feels that the requirement of not flattening ribs for their products is required, then the language needs to be changed so that wire rib laths are excluded and applies only to expanded metal rib laths. Historically, wire lath types, both welded and woven, have not been tied between supports. Wire laths generally have much larger openings and therefore the laths do not separate during plastering, and therefore, there is no need to tie the laps. This has been successfully demonstrated over several decades with the usage of wire laths. Therefore, the language needs to be changed to reflect the accepted and successful practice for wire lath types.


    Keywords

    ceiling; expansion control joints; lath; plaster; screed; suspended ceiling; walls; Cement materials/applications--specifications; Cement plaster--specifications; Gypsum plaster--specifications; Gypsum products--lath (specifications); Installation--gypsum products; Metal lath; Plaster--specifications; Portland cement--specifications; Screw attachment (for metal plaster base);
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    09-17-2009

    Technical Contact:
    Gary Maylon

    Status:
    Draft Under Development