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

When should a closed-cell backer rod be chosen instead of an open-cell rod?

In exterior or horizontal wet joints, where an open-cell rod would absorb water; use closed-cell or bicellular rod and a blunt setting tool Only on interior paint-grade caulk joints Never; open-cell rod is required in every exterior joint Only when the joint will have three-sided adhesion on purpose

Correct Answer:

In exterior or horizontal wet joints, where an open-cell rod would absorb water; use closed-cell or bicellular rod and a blunt setting tool

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