Church pool RE-construction

[Poolsean]

I suggest making sure you prep the surface of the old cement before pouring the new material to fill in the deep end. Sand blasting and in some applications, chipping the surface, allows a better bond and removes all loost plaster/cement. Also, a bonding layer, such as Multicoat scratchkote, will help adhere the new surface to the old.

Will this new 3' end still be the deep end? If not, there should be some sort of drain at the deepest part of the pool for debris to settle and be sucked out by the pump. If not, I'd recommend that you go a little deeper than 3' so that is it the deep end, THEN don't forget to bring up the bottom main drain.

[Sumo1]

Poolsean, in your suggestion about filling the deep well(Sorry I'm such a dummy-don't know how to insert quote here ),are you thinking we would use a poured material like a cement product? I was thinking of something like a bed of gravel. This is precisely why I'm asking for advice.

The new 3' spot would still be the deep end and thus would have to be slightly lower to facilitate drainage. The hydrostatic valve will be brought up to the floor level, as will the main drain. The main drain will be "Teed" off to give us two main drains and bring us into code compliance.
Hal

[Poolsean]

It may be as easy as pouring cement, although that's a lot of cement. Perhaps gravel then cement over it, or compacting dirt then cement. I think in either case, you're better off going with the opinion of an expert structural engineer.
I would think that you'd want to grid rebar on the new floor and tie it into the existing pool rebar.
I wish I knew more on this.

[Sumo1]

Thanks, Sean. Maybe one of the PBs will chime in....
Hal