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-   -   Connect vertical 4x6 posts to chimney (http://www.diychatroom.com/f19/connect-vertical-4x6-posts-chimney-145299/)

lakemans 05-29-2012 11:10 PM

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?

Bob Mariani 05-30-2012 07:34 PM

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

lakemans 06-05-2012 12:06 AM

Air/moisture barrier between vertical post and brick wall
 
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.

lakemans 06-05-2012 12:10 AM

If load is transferred around the chimney by the header....
 
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?

AtlanticWBConst. 06-05-2012 05:33 AM

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.

Bob Mariani 06-05-2012 06:09 AM

To air/moisture seal the chimney.... stuff Roxul insulation at the top plate and seal the edges of this with spray foam.

joed 06-05-2012 06:29 AM

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


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