ASTM WK43401

    Revision of C926 - 12a Standard Specification for Application of Portland Cement-Based Plaster

    (What is a Work Item?)

    Active Standard: C926 - 14a

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


    1. Rationale

    The topic of Paragraph A2.2.3, regarding the soffit drip, best belongs in C1063, as soffit drips are a part of the lath installation, not the plastering installation. A current mandatory requirement, A2.2.3 describes a soffit edge configuration conceived to be a drip edge but in practice is of minimal effectiveness because it does not manage water at the water barrier level, the horizontal casing bead does not drain the wall cavity above it and can corrode, staining the stucco surface. The current language does not require drainage holes and even if drilled would corrode. Further, this assembly is never constructed in contemporary plastering because it is functionally obsolete and has been replaced by various other soffit drip screed assemblies that are more effective. See also the concurrent C1063 ballot item for 6.3.3 adding a viable drip screed requirement to replace A2.2.3.


    brown coat; cementitious; exterior plaster; fog coat—bond; portland cement; scratch coat; stucco;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Matthew Innocenzi

    Draft Under Development