 So I think a couple of issues here. First of all, just in terms of repointing the loose mortar, that's going to probably be necessary no matter what you do. And the most common mix for mortar is four-to-one, which is basically four-part sand to one-part cement. There are sometimes variations if you're an old brick that's really, really a soft brick. Sometimes you go five-to-one or six-to-one, six-part sand and one-part cement.