Enough support
- Thread starter Irishman
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That would scare me having over 1200 pounds over 2 parallel with those joists. I would try to support them somehow. Ask an engineer. Asking a forum isn't always the greatest course of action. I mean 1200 pounds+ and then a sump? Scary, I mean at minimum add some 2x6 herringbone struts and the closer you are to foundation walls the better but I got a 120 and moved it the basement because my 80 gallon was already making the floor bounce on the main floor. and those joists were not parallel
I forget how much they were, just found one of the home depots with them in stock. I think it was only like 20 or 40 each and I did 2. FIL helped since he had a hammer drill and a masonry bit to get them bolted into the floor. Then went overkill with a 8x4 which that length again I completely forget but I want to say whole project was like $120. Oh and some strapping etc to mount the beam to the joists before putting the jack up. We ran them parallel under the tank which goes perpendicular across the beams. (Tank perp to the beams usually ideal to hit more)
Yours if your measurement is accurate that it is actually sitting on all 4 is pretty good though looks like a pretty long span which makes weight in the middle more of an issue. (Pros/cons to being in center vs the sides, sides increase shear stresses vs in the middle is bowing) I think a short beam that crosses all 4 beams with a single jack centered under the tank would do pretty well for reducing bowing pressure. You dont want to get the jack super tight up into the joists making counter pressure, just up until it's barely touching and maybe a quarter turn extra. Idea is it's not pressing up but is just preventing it from dropping down.
Ideally this needs to be done before tank in place or at least before filled.
Yours if your measurement is accurate that it is actually sitting on all 4 is pretty good though looks like a pretty long span which makes weight in the middle more of an issue. (Pros/cons to being in center vs the sides, sides increase shear stresses vs in the middle is bowing) I think a short beam that crosses all 4 beams with a single jack centered under the tank would do pretty well for reducing bowing pressure. You dont want to get the jack super tight up into the joists making counter pressure, just up until it's barely touching and maybe a quarter turn extra. Idea is it's not pressing up but is just preventing it from dropping down.
Ideally this needs to be done before tank in place or at least before filled.
Gotta be honest, I have a similar situation with my 180. The floor creaks, but it does in the whole house. How far apart are those parallel joists? How far is the run from the wall to an Ibeam? If you have room underneath, you could aways put a 2x4 to the bottom of the joist. Single 2x4s can support thousands of LBs by themselves.
If they are the standard 2x8' 16" on center you will have no problems. Most pine 2x8s will hold between 1000 and 1300 pounds at its weakest point. It would have to be a complete floor system failure for that to be an issue. I understand your trepidation but its really wasted fear. Go for it.
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