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Floor load capacities

Now I'm really scared. 

I am in the process of building a tank stand out of 4 x 4's for the 30 gal
and the 20 gal long.  I'll bring those two tanks to work.  Right now they
are on one of those wrought iron stands.  The other tanks, 2 20 gals and 2
10 gals, are on wrought iron stands, but they are each sitting on a sheet of
I wish I didn't have to do this. 

I talked to an architect who said that it would cost me $500 just to take
measurements and another $500 for an engineer.
All of this limits my breeding stock and raising fry.  My club is having a
big auction in November.  Hopefully, the floor lasts until then.
> ...uh, like I said I was tired when I wrote that message - the final
> should actually be 1704 p.s.f. because 21 sq. in. = 0.146 sq. ft.
> 	So it's even worse. If you have a wood floor, don't support your
> stands with thin legs; use a plywood or 2x4 'sill plate' to distribute
> load.
> -andrew

I think this confuses the issue.  we are really talking about two different
things here.  The compression and shear strengths of wood are really quite
large.  The real issue is bending strength, particularly as to its
application in the floor structure.  The load is distributed by the
floor/sub-floor/joist system.  An unattached sheet of plywood doesn't
accomplish much structurally.

For example, my 50 gallon breeder-size is sitting on leveling feet which are
one inch in diameter.  When I did the structural calculation while building
the stand I found that this was more than double the area required.  In my
opinion 4 x 4's are overkill.  The sub floor is designed to transfer the
load to the joists.  I mean, heck, a fat lady in high heeled shoes puts more
of a point load on the floor than that.  

You can bet the farm that I made sure the tank load was perpendicular to the
floor joists though.  

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