Factors Affecting the Durability of Sealants in Contact with the Finish Coating of EIF Systems

    Published: Jan 1992

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    Failure of relatively new joint seals where the sealant was applied directly to the finish coat of the exterior insulation and finish system (EIFS) was first noted by the authors in 1975. During 1984, the failure of horizontal sealant joints in vertical surfaces on various projects with various types of sealants prompted an investigation into the cause or causes of joint seal failure.

    From 1984 to 1991, a number of laboratory and field tests have been performed in order to correlate field and laboratory data. This paper discusses the effects of moisture accumulation within the wall system on the finish coat properties and the effect on the bond between various sealants and the finish coat when the properties of the finish coat are altered by elevated moisture levels.


    backwrapping, base coat, cohesive failure, exterior insulation finish system (EIFS), finish coat, prewrapping, sealant

    Author Information:

    Kenney, RJ
    R. J. Kenney Associates, Inc., Plainville, MA

    Piper, RS
    R. J. Kenney Associates, Inc., Plainville, MA

    Committee/Subcommittee: C24.80

    DOI: 10.1520/STP24240S

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