This may sound like a stupid question but,..I was wondering how to frame out a chimney stack. It will be clad in siding and 2×4,….hell,..it is probably easier to do it than to explain it.  I see them all the time up on the decking but I have never investigated. A builder is in a pinch and needs me to frame it up…and guess what…I never have. Looks like about 60 inches tall. I am assuming that you lay your plates out on the deck and stick frame it up like a regular wall…am I right. Do I need a cap plate or will one do. Do I neeed to beef up the corners like post or no. I will do it once and in a year a guy is gonna post this same question and I will be able to act like a bigshot..see…thats how it works. So have fun…laugh it up..I’ll put the checkin the mail fo rthe advice. Thanks