We are building a pool in North Texas. Our neighborhood is well known for very volitile soil movement. In fact, some pools have failed and many pool builders refuse to build anywhere in our neighborhood. However, the soil report on our house was very favorable compared to the rest of the neighborhood.
We are building a 18 K gallon pool, gunnite, Pebbletech interior, SWG with maximum deep end 6 feet.
Our problem is that 4 pool builders have 4 very different opinions on the engineering of the pool. All agree that the steel structure needs to be more dense and the gunnite thicker throughout. Here are the 4 opinions:
1. Soil injection, gravel base, 17 piers recommended but not required ($ 10K extra)
2. 13 cement bell piers, gravel base (estimate $15K extra), opinion that soil injection is a waste of $
3. 13 spiral piers
4. flood soil with water, overdig hole, corrugated cement box base, suspend pool above this
????? At this point we feel like we could just roll the dice. All companies work with engineers and said they consulted with them on the project. Any opinions out there? Do all of the above work? thanks for any help figuring this out.