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5 parts soft sand, 1 part cement. Pointing trowel and/or brick jointer. Remove loose before starting. Existing looks like has red dye in it?

Builders not schooled in the art of lime tend to think of it as just something you add to cement mortar. Do you know what ratios he used? May be less problem with granite than with a soft limestone.

Maybe his BCO is insisting on it because it's the method he understands.