Not if, but HOW floor support.

[savannah_az]

The question is not do I support my floor (unless someone can assure me 10000% not to), but HOW do I support my floor. The tank is running perpendicular to the floor joists, about inches away parallel to the large center beam connected to the supports. The right edge of the 8 foot tank will start about a foot away from the concrete support. Please note that while I'm handy enough to do this myself, I'm not versed in the proper lingo (for the most part) so please answer in laments terms. Seems like the most responses for other people are sister joints or screw jacks. So in my scenario which one is better and where?

 

[duanes]

Floor jacks are sold at most large hardware/home care stores.
Hard to tell how close the bottom of your floor and the ground is, or whether its cement or just dirt underneath.
I used adjustable floor jacks under tanks in my basement, they went from about 4ft to 10ft in adjustable size, and some have a flat base to help if the place they rest isn't the best.

 

[savannah_az]

The floor is dirt and it's about maybe 3-4 feet. I figured any kind of support would need me to pour some concrete to make a flat surface to support it.

 

[justarn]

You could lay a piece of polythene down and a chunk of 8ft 4x4 then bang in some 4x2 uprights. Make sure they are nice and tight to the point you need to hammer them in, then spike them at 45degree with some 4 inch nails... Similar to what I done for my 300g.

 

[savannah_az]

You could lay a piece of polythene down and a chunk of 8ft 4x4 then bang in some 4x2 uprights. Make sure they are nice and tight to the point you need to hammer them in, then spike them at 45degree with some 4 inch nails... Similar to what I done for my 300g.

I'm guessing that would be the farthest point away from the large support beam the tank is perpendicular to, but yet still underneath the tank itself, correct?

 

[justarn]

Yes, mine is against a brick wall so the joists go into that at the rear of the tank, I placed my uprights at the front of the tank furthest from the wall on every joist. How big is your tank? How many litre?

 

[justarn]

You could use a sheet of 19mm ply if you are worried the 4x4 will sink depending on how hard the mud is, this will spread weight further.

 

[savannah_az]

So do I need to sister the beams that run parallel to the tank? Btw the tank is 210, sorry for leaving that part out.

 

[DN328]

OP, I was in a very similar scenario. In my case, my tank was exactly on top/parallel to the center beam you see in this picture (closest in the picture). I added 8' x 4' to each side of the original beam. I also have dirt floor, so used the concrete platform and held the beams up with 4 x 4. This is basically how the original beams were set-up, just with a bigger cement platform than mine. I opted not to sister the floor joists - but not that it's a bad idea. My tank is 72" x 30 x 28 (height) , and figured the three beams supporting that area would be more than sufficient in my case.

Just an idea to explore if you decide using floor jacks, etc.

 

[FreshyFresh]

That's a really nice and neat job DN328.

Mine was a little easier given I've got a basement, but this is what I put below my double (top/bottom) 75g stand: