SC Glass And Glazing Practice Questions - South Carolina Glass And Glazing Contractor Examination Exam

Why must three-sided adhesion be avoided in a movement-capable sealant joint?

Because the sealant needs to bond only to the two joint faces so it can stretch in an hourglass shape; bonding to the back makes it tear Because sealant is only allowed to touch metal, never glass Because three-sided adhesion makes the joint too waterproof Because backer rod is prohibited in glazing joints

Correct Answer:

Because the sealant needs to bond only to the two joint faces so it can stretch in an hourglass shape; bonding to the back makes it tear

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