how to properly reinforce raised foundation?

[playaslk]

ok so here is the story. I have a 6 x 2 x 2 tank (150gals) i would like to place in my living room along the wall that faces into the center of the house (so not a outer wall - meaning its in "middle" of the floor grid).

The foundation is raised approx 22 inches... as it happens the tank's position would be sitting across the floor beams which are 2x8 and are about 14 inches apart. So approximately 4 beams would be holding the tank...

So far so good.

The problem comes in here... The wall of the living room does not correspond w/ the cement walls that support the 2 x 8s under the floor. The tank will actually stand parallel to the cement walls under the house that support the beams. (so that means, the beams run north south, the support cement walls go east west and the tank will be east west right in between the support walls).

the distance between the support walls (bare floor beams without mid support) is about 90 inches).

So the tank will be parallel to cement supports standing about 40 inches away from each support wall, over the beams.

If that makes any sense, great. Pic is below, sorry for crap editing but you should get a rough idea.,. How do i figure out if the floor can hold that weight?

THANKS!

 

[scottt]

sandwich a 2x8x8 to the preexisting 2x8,s under the tank make sure the ends sit on top of the cement walls

 

[libayn]

run a 4x6x8" under the beams where the tank will set.place 2 or 3 cap block on the ground and make sure there level.get floor jacks and use them to support the weight so your floor dont.jacks hold around 15k each and cost roughly $25 each.my 210 sets middle of the house and that is how i have mine set up.

 

[seedubs1]

Another option is to build a post in the middle to support the existing beams in the middle. Sink a sonotube and fill with concrete, or pour yourself a small foundation in the middle and build up with masonry.

 

[pocel]

Is your tank going to run perpendicular to the joists if this is the case it should be easy to reinforce. i think the easiet way is to support the joists the tank will actually be on with the jacks in the earlier post i would just make sure to. I used deck cement blocks and have 6 4x4's on the joists as posts i have had no problems with settling if you use the blocks you really have to make sure your soil is compacted good so you dont get alot of settling. My tank is up against a wall and is perpendicular to the joists so it spreads the weight out more.

My joists are on 12" centers too. I gutted the house completely it took 3 years to get my tank set back up and out of storage but man im happy now

 

[pocel]

sandwich a 2x8x8 to the preexisting 2x8,s under the tank make sure the ends sit on top of the cement walls

while I agree this method would work just sistering on to the existing joists dragging these into a 22" clearance under a house would require alot of cussing on my part beating joists into place with a framing hammer under an older house that has settled is no fun

 

[seedubs1]

That's why you just support the joists that are already there

 

[89must]

we'll being those 2x8 are spaning less a little less than 8 feet and there good to about a 12 foot span unsupported sister the joist affected with 1/2' plywood on one side when you sister joist make sure you you use construction adhesive and structural screws and those joist will not have one problem holding up athat tank