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abrown
attaching wall to chimney

I live in a house that was built in the 1840's. I am in the process of renovating a room and am wanting to attach a wall to a chimney that has plaster on it. I am wondering what is the correct method to attach something to a chimney that is covered in plaster. My idea was to drill into the chimney and epoxy so allthread into the chimney and then attach the 2x4's to the chimeny with a liquid nails and hold it in place with the allthread. I am just wondering if this will hold secure enough.

JLMCDANIEL
Re: attaching wall to chimney

Generally speaking you do not attach a wall to a chimney because they pretty much move independent of the structure.
Jack

KKelly
Re: attaching wall to chimney

This is one of those questions where a hundred answers could "sound" right but nobody really knows unless he's standing in front of your "Chimney" and inspecting the structural integrity of it and knows what kind of wall you're intending.

Generally, as the previous reply suggested, a chimney is not and should never be considered a structural aspect of a house. It’s a chimney and should always be treated as a wall meant to surround smoke. A chimney isn’t just an upright box wall, it’s actually meant to “draw” smoke and that’s it’s first, and normally, it’s only priority.

Using Liquid Nails to embed “all thread” into the brick is an interesting idea but consider that “all thread” is usually a relatively (20-24 per inch so it would act more like a metal file) fine course thread and not really intended to bind to an adhesive. And also consider that the brick used for a fireplace is normally soft rather than structural and also old so prone to decay. So the adhesion liquid nails would get from it is nominal at best.

Normally, if the fireplace wall is structurally sound, we’d like to embed an anchor into it using a concrete epoxy and go from there. There are occasions where you’d embed a T-anchor (basically a bolt with a very wide base under a bolt) from one side of the fireplace wall to another but that’s rare. Under most very old house conditions, you could drill a hole in a fireplace wall, run a rope through it, tie a knot on the short end and pull a dozen bricks through with a single tug.

Remember, a chimney is a wall that’s been exposed to very extreme hot/cold, moist/dry conditions for a very long time. Under those conditions, weakened mortar, particularly the standard old lime based mortar, and the brick between it, gravity and happier days are the only things holding it together.

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