STP922

    Experiences in Identification of Thermal Bridging and Elimination of the Thermal Short

    Published: Jan 1987


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    Abstract

    Our experiences encompass basic laboratory studies using the guarded hot box, field identification of the building envelope defect, and correction of the problem based on proven techniques and products.

    In the laboratory, a total of 24 wall configurations were tested using ASTM Test for Steady-State Thermal Performance of Building Assemblies by Means of a Guarded Hot Box (C 236-80). Comparing theoretical R versus actual R values enabled us to identify several causes of thermal shorts along with techniques to correct the defects.

    This work was related to the field as we observed:

    (a) thermal bridging due to construction design,

    (b) insulation gaps due to workmanship defects, and

    (c) inability of certain construction systems to recover from high humidity and condensation conditions.

    Considerable attention was given to these factors during our introduction of two new fiberglass products. In both the retrofit and new construction field, examples illustrate how the insulation was used to correct the envelope defects as well as how to avoid the defects.

    Keywords:

    thermal insulation, heat transmission, guarded hot box, thermal resistance, thermal short circuit, wall systems


    Author Information:

    McCaa, DJ
    Group leader, senior project leader, project engineer, and manager, Thermal Testing Laboratory, Residential Projects Development, respectively, Insulation Group, Research and Development, CertainTeed Corp., Blue Bell, PA

    Pentz, ED
    Group leader, senior project leader, project engineer, and manager, Thermal Testing Laboratory, Residential Projects Development, respectively, Insulation Group, Research and Development, CertainTeed Corp., Blue Bell, PA

    Carre, J
    Group leader, senior project leader, project engineer, and manager, Thermal Testing Laboratory, Residential Projects Development, respectively, Insulation Group, Research and Development, CertainTeed Corp., Blue Bell, PA

    Infante, LJ
    Group leader, senior project leader, project engineer, and manager, Thermal Testing Laboratory, Residential Projects Development, respectively, Insulation Group, Research and Development, CertainTeed Corp., Blue Bell, PA


    Paper ID: STP18488S

    Committee/Subcommittee: C16.30

    DOI: 10.1520/STP18488S


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