[Tangman]

What suggestions would you have to increase the strength?
The I-joists have to cross the foundation at 90 degrees. I doubt there is anything they could do to increase the strength. After all I-josits are already enginered.
Yes, they are engineered, but not for point loading ,ie:having all the weight in one spot

Do you work in the industry Tangman? YES What are you basing your opinion on?

I guess the real question is would it be any different then having the tank located somewhere else within the house as it would only be supported by i-joists unless you located it over a beam or reinforced the i-joist from below. First off, the cantilever is free slung out side the house with no support underneath, other than the I-joists. this is why Chin_Lee suggested the supporting the out side edge of the cantilever. Also as I already said I-joist are not engineered for point loading , squash blocks ( 2X10's) must be used beside I-joists between squash points ( bearing walls)

What do you suggest

Thanks