- Joined
- Nov 13, 2016
- Messages
- 69
- Reaction score
- 22
Hello, maybe someone can help answer and provide their opinion....
I am installing a 125 gallon cube tank on the second floor along an exterior bearing wall. Tank will be 5" off of the exterior wall. The tank will rest on three joists and the joists are 9" high and span 15' to a beam in the middle of the house that rests on a bearing wall. A couple of those floor joists have already been sistered with a second floor joist that I installed many years ago when I finished the basement. I am anticipating around 1600 lbs final weight when factoring in, tank, stand, water, rock hood etc...
It is a finished basement and I plan on installing a header beam of doubled up LVLs perpendicular to the floor joists about 40" out from the basement bearing wall to help support the front of the tank. Now to support that header I install I am planning on installing 2 mono posts under the header.
My question... The basement is a poured concrete slab so there will be no foundation under the mono posts. Just the slab. Do I need to cut the slab to pour footings for the two mono posts?
My thought process is that each post will be supporting 800lbs and the supporting post plate on the concrete slab is 4"x5" so 20 square inches/ 800lbs= 40PSI. Isnt' concrete rated for 2500PSI thus I should be fine in not cutting up the concrete to add a pier foundation?
What am I missing?
I am installing a 125 gallon cube tank on the second floor along an exterior bearing wall. Tank will be 5" off of the exterior wall. The tank will rest on three joists and the joists are 9" high and span 15' to a beam in the middle of the house that rests on a bearing wall. A couple of those floor joists have already been sistered with a second floor joist that I installed many years ago when I finished the basement. I am anticipating around 1600 lbs final weight when factoring in, tank, stand, water, rock hood etc...
It is a finished basement and I plan on installing a header beam of doubled up LVLs perpendicular to the floor joists about 40" out from the basement bearing wall to help support the front of the tank. Now to support that header I install I am planning on installing 2 mono posts under the header.
My question... The basement is a poured concrete slab so there will be no foundation under the mono posts. Just the slab. Do I need to cut the slab to pour footings for the two mono posts?
My thought process is that each post will be supporting 800lbs and the supporting post plate on the concrete slab is 4"x5" so 20 square inches/ 800lbs= 40PSI. Isnt' concrete rated for 2500PSI thus I should be fine in not cutting up the concrete to add a pier foundation?
What am I missing?