I want to put a fish tank in an upstairs room, it will weigh approx 1000
lbs when full. I am concerned that the weight will be excessive on the
ceiling joists. It will be against a wall and span at least 3 joists. The
way I look at it is, if 6 people stood against the same wall i wouldnt be
concerned, so I shouldnt be concerned about the tank, but I am. D'you think
it'll be okay?
Thanks for any input
Is it to be sited upstairs or down stairs? Is it against a brick wall or a
If it is against a brick wall and the joists go into that wall I would think
it would be okay. If it was upstairs in the middle of the house next to a
partition wall I would be concerned.
Do the joists end at that wall, or is it just a stud wall, built on top
of them? Are the joists in good condition and is there any springiness
in the floor at the moment? Is the floor level at that point, or falling
away from the wall?
The odds are that everthing will be fine. 1000lbs may sound a lot but
isn't really - houses are massively over-engineered for what they are
normally used for. As long as the joists are not in mid-span, they
shouldn't noticeably deflect with this load. If they do and the floor
starts to show signs of any movement - you must re-think.
You could try it first with a stack of bags of sand - a bit cheaper and
easier to move around than a fish tank.
Obviously you could take the load off the floor and put it into the wall
- if the wall is up to it. A piece of angle iron bolted to the wall at
floor level will take the back legs of the tank and hence half of the
weight. You would only be putting 500lbs onto the joists then. Adding a
band around the top of the tank, also bolted to the wall, would take the
entire load off - it would even be fine in my place with its old joists,
springy floors and the ravages of 400 years of everything with teeth
having had a go at them..
Thanks for those comments, yes the tank will be going against a solid wall
which will help matters, I never thought about a piece of angle iron bolted
to the wall to take half the weight, thats a very good idea.
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