Basement reinfocement

[Myka]

Originally Posted by Coleus

Yes. the tank will sit on tiles

Ohhh...I think you're going to be in trouble without reinforcing the plywood since the tank is sitting in between the joists. Just a slight movement will pop those tiles off. Another option is to pull up the tiles that will be under the tank and install them with flexible thinset and sanded silicone grout.