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Old 05-30-2012, 12:10 AM   #1
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Connect vertical 4x6 posts to chimney


I have an old house with a corner chimney. Two separate walls ending at vertical 4x6 post abut the chimney. Also, across the top of the
posts on either side of the chimney rests a 4x10 to support the roof joists, One of the vertical 4x6 post needs to be replaced, and after some demo work I can't see any connections to the chimney - a major concern out here in earthquake country. How do I connect the vertical post (wall) and horizontal beam to the chimney (which I believe is merely brick and mortar from the 50s)? I've heard you can't effectively anchor to brick.... Can I use some sort of Simpson Strong-Tie to effectively anchor to the chimney?

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Old 05-30-2012, 08:34 PM   #2
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Connect vertical 4x6 posts to chimney


you don't The masonry chimney moves independently of the roof structure. Load is transferred around the chimney.

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Old 06-05-2012, 01:06 AM   #3
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Connect vertical 4x6 posts to chimney


What material would you recommend to apply between a 4x6 vertical post (supporting a header) and a brick chimney - as a air/moisture barrier? It needs to be of sufficient flexibility and thickness to conform to the slightly irregular coutours of a brick cchimney/wall.
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Old 06-05-2012, 01:10 AM   #4
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Connect vertical 4x6 posts to chimney


If I am not to connect to the chimney because the load is transferred around the chimney by the header spanning in front of the diagonal corner chimner, then won't the shear value of the walls abuting the chimney be insufficient?
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Old 06-05-2012, 06:33 AM   #5
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Connect vertical 4x6 posts to chimney


You have to treat the chimney area like a window opening and use sufficient double header arrangments (suitable to carrying the loads for the area/location). Roof loads need to be transferred to footing or foundation areas.

We can't help you design code-approved and area-required earthquake-related structural loads over the internet.
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Old 06-05-2012, 07:09 AM   #6
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Connect vertical 4x6 posts to chimney


To air/moisture seal the chimney.... stuff Roxul insulation at the top plate and seal the edges of this with spray foam.
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Old 06-05-2012, 07:29 AM   #7
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Connect vertical 4x6 posts to chimney


Spray foam to fill the gaps and then polyurethane caulk to seal the outside edges.

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