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Modern construction places higher demands on glazed openings. The proper selection of sealants and their application are required for satisfactory performance. There are options available in Class II sealants both in proven performers and newer products with good characteristics. Advantages and disadvantages should be considered when determining which generic type, the need for surface conditioners, the method of application, and the labor costs involved. Consideration must be given to the type of framing member specified. Tolerances should be reviewed as they relate to the glazing reglet. Sealant failures should be analyzed to avoid repeating costly errors. There is a need to tighten specifications so as to concentrate and define responsibility in such a way that there can be little question as to the performance expected.
sealants, reglets, glass, surface conditioners, tolerances (mechanics)
Grieve, E. E.
Manager, PPG Industries, Inc., Pittsburgh, Pa.