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Many premature sealant failures occur in joints which differ from the “archetype” -- the common parallel-sided, uniform, panel-to-panel expansion joint, with an hour-glass sealant profile. Parameters are discussed for obtaining good long-term performance from non-classical types of weatherseal joints. The conditions which are addressed include problems with substrate surface profile, intrinsic properties of substrates, joint shape, and dimensions. Also presented is a summary of the considerations in preventing premature sealant failure which are common to all types of exterior weatherseal joints.
Sealant joint failure, substrate, fillet, dimension, surface profile
Senior Materials Engineer, Law Engineering, Inc., Houston, Texas