wrote in message
>I recently purchased a 90 gallon aquarium and want to use it as a
> partial room divider between my living and dining areas. My question
> is, do I need to give any consideration to load weight on my floor
> joists. My tank is only 18 inches wide and the proposed location of the
> tank runs parallel with the joists so it is possible it could be above
> only one joist when it is set up.
Generally the more knowledgeable a poster is about structural
engineering, the less likely they are to offer any specific advice on
this type of question. There is a lesson in that for the rest of us ;~).
These problems are quite situation dependent, requiring joist span,
spacing etc etc ad nauseum to reach recommendations.
I can tell you a few things with some certainty. A 90g (or 167 lbs/sq ft
over 6 sq.ft) is not likely to fall through your floor. How much
deflection is caused varies according to your setup (proximity to
structural beams or walls). However - falling through the floor and
floor deflection is not going to be your biggest problem. Placing any
tank parallel to joists makes it prone to significant wobble (front to
back as you walk by it). Having it used as a room divider makes this
worse (farther from structural stabilizing wall and having traffic on
either side). You have some concerns with the static load which won't be
adequately answered here, but your show-stopper will be the live load
I would look at the floor under the tank to see if a stabilizing post
could be added to a wooden H frame crossing the two joists underneath.
This stabilizes the live load (tank wobble during foot traffic), and
would remove any nagging concerns regarding the static load. If a post
is not possible, a custom stand which distributes the weight across 3
joists and lowers the tank's centre or gravity closer to the floor would
be a good approach to follow, along with some expert consultation.
Generally I use 55-60g as the dividing line between having concern about
the floors, but I personally wouldn't place a tall 55g in the location
you're describing. hth