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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.
A stone sill that slopes back toward the wall feeds water into the masonry. BIA lists neutral or negative slope on sills as a structural indicator.
The crown is the slab across the top of your chimney. It is the smallest piece of masonry on the building and the one holding the most water off everything below it. Here is how to read it, and what a correct one has that a failed one does not.
A weep hole is the exit door for water already inside your wall. BIA anticipates that maintenance work will seal them shut. Here is how to check yours and what to do.
The lintel is the steel angle carrying the brick over your window. When it corrodes it expands, and the wall above it has to move. Here is how to read it.
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