Read this guys explanations.
there is more to the artical but as you can see very easy to read and understand.
http://www.petkb.com/Uwe/Forum.aspx/...quarium-Weight
Quote:
Homes are built with the following codes:
Attic floors must support 20 lbs per sq ft. [2x6s on 16 inch centers
at span]
Dwelling Units (meaning all rooms in the home other than bedrooms)
must support 40 lbs per sq ft. [2x12s on 16 inch centers at span]
Sleeping Rooms must support 30 lbs per sq ft. (although most homes
are built at 40 lbs per sq ft or greater throughout) [2x10s on 16 inch
centers at span]
In comparison, commercial offices, such as office buildings are only
50 lbs per sq ft. [2x12s on 16 inch centers at 3/4 span]
FWIW: A glass aquarium sitting directly on the floor has a greater
pound per square inch weight on the flooring than one sitting on a
properly constructed stand with a 3-1/2 inch perimeter footprint.
The framing of an all glass aquarium is often molded to product only a
1/2 inch perimeter footprint. Thus with a perimeter measurement of
only 156 inches at 1/2 inch wide, we only have 78 sq in of surface
touching the floor. 2000 lbs divided by 78 makes the weight on the
flooring over 25 lbs per square inch.
As we see from above, on the proper stand, the weight would only be 4
lbs per square inch on the same flooring for the same aquarium.
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