STP992: Diagnosis of Terra-Cotta Glaze Spalling

    Thomasen, SE
    Senior consultant and senior engineer, Wiss, Janney, Elstner Associates, Inc., Emeryville, CA

    Searls, CL
    Senior consultant and senior engineer, Wiss, Janney, Elstner Associates, Inc., Emeryville, CA

    Pages: 10    Published: Jan 1988


    Abstract

    One of the most common types of deterioration observed in terra-cotta buildings is glaze spalling. This separation of the hard, fairly impermeable glaze from the underlying clay bisque exposes the clay to water infiltration and accelerated deterioration. The mechanisms responsible for glaze spalling are fabrication defects, incorrect installation, environmental exposure, and improper maintenance. The investigation of glaze spalling consists of a field survey, field tests, and laboratory analysis. Once a diagnosis of the causes is made, appropriate preventive measures can be implemented.

    Keywords:

    terra-cotta, spalling, glaze spalling, restoration, masonry, deterioration, testing


    Paper ID: STP27269S

    Committee/Subcommittee: C12.04

    DOI: 10.1520/STP27269S


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