ASTM WK43400

    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

    Section A2.2 is titled Provisions for Drainage Behind Exterior Plaster. Paragraph A2.2.1, as a current mandatory requirement, describes a floor slab edge/cement plaster configuration conceived to be a water drainage provision. This requirement dates from the 1960s using plaster over open stud construction where the described offset to the floor slab was intended to form a drainage plane between the plaster and the framing system. No mention of how the code required water resistive barrier integrates into this assembly is described. The construction configuration described is antiquated, ineffective at managing water and no longer used in modern day plaster applications. Deleting paragraph A2.2.1 keeps C926 relevant.


    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


    C11 (14-01)

    Ballot Item Approved as C926-2014 and Pending Publication