I own a 1880’s brick victorian home in Denver, Co. One of my exterior walls has separation between the two layers of brick. How do you tie the double layers of brick together? And what concerns should I have at this point?
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I don't know how large an area you are talking about, but we did a 10 square foot area (corner of a basement) successfully by removing a brick and making an open aluminum lined ramp with sideboards that ended with a nozzle that fit the brick opening. We protected the area around the opening with duct tape. We just pushed it in with a trowel. You might have to do this in several places depending on size.
One thing we have found that helps in a situation like this is to add lime to mortar mix 1 to 12. This makes the mortar "slick" such that it will flow freely through a mortar bag or a funnel situation like above.
If you wanted to get more serious about fixing your situation I would think thinset would really lock it together - it is a form of hydraulic cement - sticks better, sets up faster, but costs more.
I'm not an expert on this situation, just giving you some ideas without knowing much about your situation. Hope it contributes.
Edited 12/13/2005 9:49 pm ET by Fonzie