I have a 140 G. on the second floor positioned over the cantilever outset for a china cabinet in the dining room. It hasn't shifted in the three years or so that it's been there. Placing the tank against the wall with the joists running perpendicular to it like this:
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is the strongest position it can be in and I have seen many large tanks on second floors that way without additional support.
Toxic, your 40lb/15lb per sq ft idea just clouds the issue. It doesn't relate to placing a load in one area of the room. What it relates to is the total weight the room (floor) can bear.
For ex. A 10' x 10' room can hold 15lb's/sq. ft. DW min. 10x10x15=1500. The room can hold 1500lb's DW.
The formula can't be used to work out how much a specific part of the room can hold.
Last edited by Dale; 10-17-2008 at 12:48 AM.
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