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Cantilever Floor Framing
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Re: Cantilever Floor Framing By  DWalker

Posts: 0

12/7/2000 8:03:00 AM

When things dissappear from 94, I''ve often found them in Vol. 11 of 97. I looked in Vol. 1 and couldn''t find it, and also in the 2000 IBC and couldn''t find it. I don''t have Vol. 2 of 97. Engineers?? Little help please.


   

Re: Cantilever Floor Framing By  Rik D

Posts: 0

12/7/2000 11:12:00 AM

After a quick glance I can''t find the specific code siting. I''ll keep looking, but as an engineer I can say you were right to call the contractor on this. The situation went around the office and the consensus was, no way in h*** would any of us design that. The backspan of the joist should be at least twice the cant length, prefeably three times. If not, special attention must be paid to uplift at the rear connection. From the situation you described this was not done. A few 16d nails in a double joist doesn''t cut it.


   

Re: Cantilever Floor Framing By  DIM

Posts: 0

12/7/2000 1:43:00 PM

Try 1997 UBC Sec.2320.5.4.1


   

Re: Cantilever Floor Framing By  CCSE

Posts: 0

12/7/2000 3:23:00 PM

First, I can say there is no such requirement in UBC. The UBC97 sec. 2320.5.4.1 address the bracing vertical plane offset for conventional light frame construction. So if the plan design by registered professional (see sec. 2320.1), they can have 1:1 ratio (or whatever if it?s work) especially in your case when the floor joist cantilever 3 feet with back span of 6 feet. Assume floor joist spacing @ 16 ? o/c supporting live load and dead load of 60 and 10 psf respectively (just like balcony). The uplift about 30 lbs/per floor joist, 2-16d nailing should work just fine for floor joist (end connection). The double floor joist supporting cantilever floor joist must be check for total uplift force.


   

Re: Cantilever Floor Framing By  CCSE

Posts: 0

12/7/2000 3:23:00 PM

First, I can say there is no such requirement in UBC. The UBC97 sec. 2320.5.4.1 address the bracing vertical plane offset for conventional light frame construction. So if the plan design by registered professional (see sec. 2320.1), they can have 1:1 ratio (or whatever if it?s work) especially in your case when the floor joist cantilever 3 feet with back span of 6 feet. Assume floor joist spacing @ 16 ? o/c supporting live load and dead load of 60 and 10 psf respectively (just like balcony). The uplift about 30 lbs/per floor joist, 2-16d nailing should work just fine for floor joist (end connection). The double floor joist supporting cantilever floor joist must be check for total uplift force.


   

Re: Cantilever Floor Framing By  Pablito Gener

Posts: 0

12/7/2000 4:41:00 PM

Insp Dude,
Check UBC chapter 23 2320.5.4.1 division IV
Good luck,
pgener


   

Re: Cantilever Floor Framing By  Rich

Posts: 0

12/8/2000 8:16:00 AM

I don''t believe the code ever covered the specifics of cantilevers. The rule of thumb as I teach it is they can cant out double the depth of the joist for a non-load bearing wall and the depth of the joist for a load bearing wall. Anything else has to be engineered. The ratio of the back span to the cant is 2:1.


   

Re: Cantilever Floor Framing By  Curtis

Posts: 0

12/10/2000 6:13:00 PM

As an engineer, I agree with CCSE. However, he used assumed numbers and conditions. The cant. floor system needs to be addressed by an engineer. A rule of thumb should never be used. There are so many exceptions. A backspan can be as large or small as the situation requires. But each case must be looked at for uplift values. An engineer needs to reveiw the situation and give his/her approval, or a fix.


   

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