WoodCentral Forums

Est. 1998 — 27 years of woodworking knowledge

Framing a base for a 3400-lb fish tank

Posts

Framing a base for a 3400-lb fish tank

#1

admin

The following is from Reddit. I thought this might be interesting to get opinions on--both to spur some forum activity and because I'm personally interested in this. I'm not a woodworker, but I do occasionally make things like this for the garage where the #1 objective is structural integrity and not aesthetics. And I'm not versed in how to calculate tension and compression loads, and usually second-guess myself on how to do the joinery. 

As a novice, my first thoughts are that maybe some cross-braces would be in order, but then after considering it will be skinned in 1/2" plywood, that may not be necessary. And that if any consideration had been given to the floor; i.e., if joists, would they carry a 3200-lb load on that footprint?

So what do you think? Anything you would do differently?


From Reddit:

Will this hold a 300 gallon aquarium on the top, with a 125 gallon sump underneath? Estimated weight is 3400 lbs. The 2x4s are all notched, and sistered together with wood glue and screws (stronger than a 4x4). We’re going to skin it with 1/2 plywood tomorrow for additional strength.

will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-km1wizum8odd1.jpg?width=1080&crop=smart&auto=webp&s=f7b9657ce2de3d3417789ee170eb64434f2235fa
will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-zwn6setm8odd1.jpg?width=4032&format=pjpg&auto=webp&s=07b3eb53b622a7aebeef22897ba801b985452df2
will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-4ki9ketm8odd1.jpg?width=3024&format=pjpg&auto=webp&s=ec66a3d0b301f16a616e4f2b66496fe7922fa335
will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-8yqvuftm8odd1.jpg?width=3024&format=pjpg&auto=webp&s=df7f1368ded4f24a2434ad57742560f59b404f51
will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-q7gwvktm8odd1.jpg?width=3024&format=pjpg&auto=webp&s=c1d393a749bce02f66ed2100daff288325826955
will-this-hold-a-300-gallon-aquarium-on-the-top-with-a-125-v0-0ayluftm8odd1.jpg?width=4032&format=pjpg&auto=webp&s=e689d44b133678522de04ef703018f86cdf055d1

Re: Framing a base for a 3400-lb fish tank

#2

Douglas fir posts will support 600 psi, which is far stronger than necessary to support that weight. I also agree that it must be skinned with plywood to provide shear strength. And I agree that the bigger question is whether the floor will support that much weight. I'd want to be really sure that it would.....

Re: Framing a base for a 3400-lb fish tank

#3

As with any cabinetry or long piece, I'd include some sort of adjustable leveling hardware.

👍 This page answered my questions

Your vote helps other woodworkers quickly find the answers and techniques that actually work in the shop.