Reinforced floor

[Risk1994]

I have been totally unsuccessful at finding a structural engineer so Im going to have to do this myself.

Replacing my 75g with a 111g (red sea reefer 525G2).

Water alone will be roughly 1200lbs. I cant find the weight of the stand/tank. I'm going to be safe and assume 2000lbs total.

The tank is up against a load bearing wall but parallel to the joists.

Joists are 2x10 and 12" on center with a 17' span.

It will sit on just 2 joists...see below.

The new tank willl sit on joists 2 and 3. Joist 1 is only about 2" from the load bearing engineered beam but not attached to it and the new tank wont be on it anyway. There is an HVAC duct that I cannot move between joists 1 and 2.

Here is the view up from the basement below...

You can see how the duct is in the way, I've spoken to some HVAC folks and it would be a major headache to move that duct. However since the tank is sitting on only joists 2 and 3 Im thinking I just need to support those...see below...


Does this seem satisfactory? It allows me to support those joists without moving the duct. For some reason I feel like it would be helpful to have the 4x4 going under joist 1 as well but the tank doesnt actually sit on it.

Could use some advice.

Thanks

 

[blaxsun]

The tank itself is ~300lbs plus the stand. I saw another estimate of around ~1,800lbs filled with water, sand, rock, etc.

 

[Troylee]

I’d think your fine honestly without supports but anything you add won’t hurt.. I got 3,500 pounds sitting a top a 3/4” plywood stand.. you gotta think about this way.. your bed on 4 feet with 2 people in it are putting way more pressure on your floor than that tank ever will with such a large foot print. The 2x10’s are positioned correctly to carry the weight so it shouldn’t be an issue.. if you really wanted just tie them together with a couple spanners to box it all in and add lots of strength.to top it all off you’re only adding 350 pounds to what you currently got..

 

[Risk1994]

Wouldn't be able to sleep at night unless I went whole hog...

2 concrete filled steel Lolly columns under the 2 joists the tank sits on. Then a jack post under that joist close to the load bearing wall...the joist is only a few inches away from the tank, Due to the engineered joist and the ductwork, that's all I could fit in there.

Those danged columns weigh a ton, it took forever for me to get them home and into the basement...by myself. Then trying to cut accurately through the steel with an angle grinder...ugh what a pain...and a mess.