NM CID GS-16 Practice Questions - New Mexico CID GS-16 Masonry Examination Exam

When raising a masonry lead, why is racking back preferred over toothing?

Racking back leaves a stepped end that is easier to bond into later; toothing leaves projecting units whose later head joints are hard to fill completely Toothing is prohibited by ASTM C90, so only racking is legal Racking back uses no mortar at the lead, which saves material Toothing is used only for glass block

Correct Answer:

Racking back leaves a stepped end that is easier to bond into later; toothing leaves projecting units whose later head joints are hard to fill completely

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