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Originally Posted by kickboxer0213
most of the time the floor joists run in the same direction as the trusses run. so just look at the roof and see what direction u have the water run off and ur floor joist should run the same way.
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This is a good rule of thumb, but is not always the case. I have framed many houses that the floor joists do not run in the same direction as the trusses. However, the floor joists will
usually run in the same direction as the stairs. This is just a refrence however and is not always true. The other bit of information that I would like to pass along is that after twenty years of construction experience I have not found a stud-finder that I would trust completely. That is not to say that there are some that work, just to say that they are not foolproof. I will agree with the statement that you should put the aquarium perpendicular to the floor joists, however unless you are dealing with a 100 gal or more, there will be no short term concerns. Hope this helps clear up any questions.