Collar Joint Question
Collar Joint Question
(OP)
I'm working on a parapet that's 48" high. It's 3 wythes thick with the inner two wythes acting compositely. The outer wythe is a veneer separated by a cavity.
ACI 530-02 and UBC say a 2" min collar joint for 5' height for the 2 grouted wythes. I don't think we can go much less than that. Also, the #4's @ 32 o.c. need at least 1-1/2 practically. The architect wants 3/4" so he can put in headers. With a 2" collar the headers don't span. And says he can cut out around the vert. #4's to provide grout space around them.
Thanks for any suggestions.
ACI 530-02 and UBC say a 2" min collar joint for 5' height for the 2 grouted wythes. I don't think we can go much less than that. Also, the #4's @ 32 o.c. need at least 1-1/2 practically. The architect wants 3/4" so he can put in headers. With a 2" collar the headers don't span. And says he can cut out around the vert. #4's to provide grout space around them.
Thanks for any suggestions.






RE: Collar Joint Question
RE: Collar Joint Question
A 6" block could easily be reinforced and still provide the cavity with a thinner wall section than the doule brick plus cavity, plus veneer.
Dick
RE: Collar Joint Question
I suggested cmu before as you mentioned, Dick, but the archtiect said no. He wants a parapet of only clay brick.
Thanks very much for the comments.