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Mortar types N, O, S and M differ by how much lime is in the mix. The strongest one is almost never the right one, and on an older wall it is the expensive mistake.
The tool that cuts your joints open decides how much of your brick survives the repair. NPS and BIA both draw the same line, and it runs through the head joints.
On almost every Chicago quote, tuckpointing and repointing are one repair with two names. The mortar going back in is the decision, not the word at the top.
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