ASTM WK71669

    Revision of C1670 / C1670M - 19 Standard Specification for Adhered Manufactured Stone Masonry Veneer Units

    (What is a Work Item?)

    Active Standard: C1670 / C1670M - 21a

    Developed by Subcommittee: C15.03 | Committee C15 | Contact Staff Manager



    adhered; cementitious; concrete; manufactured; manufactured stone; masonry; veneer;;


    In reporting results for shear bond, it is required to report where the failure occurred. Currently the options are in the unit itself, between the specimen and the bond coat, between the bond coat and the mortar setting bed, or in the setting bed itself. When performing the test in accordance with ASTM C1670, a mortar substrate is prepared (as detailed in ASTM C482) and the unit is adhered using a bond coat. In the nomenclature of the reporting section, the mortar substrate is referred to as the mortar setting bed (in Section This can be confusing because in actual installation, the mortar setting bed is the mortar used to adhere the stone to the scratch coat or other substrate. To reduce confusion, it is proposed to change setting bed to mortar substrate in the reporting section of C1670.

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    Technical Contact:
    Nicholas Lang