spiff;3517619; said:View attachment 415372
It might not be needed. But you never know.. I would be worried about the effects of time. Wood can eventually start to bow when subjected to massive weight like that for years and years.
I hope this helps.
As long as one joist it right under the tank. (assuming that the joists run parralle with the tank.) you only need support under One joist but you will need two supports both about 1-2' from each end of the tank.
If the joists run perpendicular to your tank still add two supports but again make sure the are placed between 1-2' on the inside of the tank. And you'll be fine. I've done 4 tanks this way. 2-125s, 1-220, 54 corner. And I live in an old house (it's at least 60 years old.)
