hydronic heating. I believe I came across a website that had deflection
recommendations; I think I used L/480 or greater for the LL deflection.
There may have been tile involved which drove the deflection criteria.
Andrew Kester, P.E. wrote:
>
> For a small two-story apartment building we have a wood framed second
> floor with wood sheathing. The owner and architect are looking for
> sound reduction, and also a stiff floor system with reduced "squeaks"
> due to wood flexing.
>
> Right now we have suggested joists/trusses at 16" oc and ¾" sheathing
> screwed and glued, with a 2" lightweight concrete topping. I have
> combed thru the code and found nothing prohibiting using wood to
> support concrete in this manner, they do mention limiting long-term
> deflection.
>
> Is there anything in NDS about this or is this prohibited in IBC or
> other codes? Anyone see any problems with this? We are designing for
> the extra dead load, and have heard of this being done on other
> projects quite successfully. Would anyone suggest anything other than
> poly fibers for micro crack control of the lt wt concrete, maybe some
> #3s at reentrant corners or don't bother as it is just a sound
> deadening topping? Should we have them spray the concrete with water
> sealer, a bond breaker, or anything like that?
>
> Thanks,
>
> Andrew Kester, PE
>
> Orlando, FL
>
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