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Thread: Engineering for bad soil conditions/ various PB opinions

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    Engineering for bad soil conditions/ various PB opinions

    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.
    20K gallon, 99' perimeter, IG Quartzscapes, Pentair FNS 60 SF DE filter, Pentair Intelliflo Variable Speed 3 HP pump, 400k BTU Pentair (NG) heater, Pentair IntelliChlor and SWG, Pentair Legends platinum cleaner with booster pump, Spa with rock spillway, 3' grotto waterfall, 12' weeping wall with Pentair 3HP WF pump, IntelliColor Pentair LED lights

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    Re: Engineering for bad soil conditions/ various PB opinions

    I would suggest that you consult directly with a geotechnical engineer.

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    bigfunky's Avatar
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    Re: Engineering for bad soil conditions/ various PB opinions

    You need an Professional Engineer familiar with your local terrain and soil composition to draw up a plan and put his stamp on it, no way for us to advise you on something like this...
    26,000 gallon gunite IGP with 50 sq ft Spa, Jandy VS FloPro 2hp Pump, Jandy DEV48 Filter, Jandy AquaPure SWG, Jandy AquaLink PDA-PS6 Controller, RayPak R406A Heater, Polaris 380 Cleaner, completed April 2013

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    Mod Squad Bama Rambler's Avatar
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    Re: Engineering for bad soil conditions/ various PB opinions

    I like #2 and 3 but will 3rd the advice of employing an engineer familiar with your area to do a field study for you.

    If the soil report you have is based on borings, and engineer might be able to use those and it wouldn't incur as much cost as having to redo borings.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Engineering for bad soil conditions/ various PB opinions

    True, just wanted to know if any pool builders out there have any experience with unstable soil and if they have better success with one type of engineering or another.
    Thanks for your replies - we know a soil engineer, and he has no experience with pools and soil - we may need to look for an engineer that has experience with pool builds in our area. Every pool builder, though, talks about the engineers they work with and recommend, so it looks like the engineers don't agree either.
    20K gallon, 99' perimeter, IG Quartzscapes, Pentair FNS 60 SF DE filter, Pentair Intelliflo Variable Speed 3 HP pump, 400k BTU Pentair (NG) heater, Pentair IntelliChlor and SWG, Pentair Legends platinum cleaner with booster pump, Spa with rock spillway, 3' grotto waterfall, 12' weeping wall with Pentair 3HP WF pump, IntelliColor Pentair LED lights

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    cramar's Avatar
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    Re: Engineering for bad soil conditions/ various PB opinions

    Option 5: 30' above ground pool with a deep end dug out in 1/2.
    20' X 54" Sharkline Matrix Resin AGP, 9400 Gallons, Sta-Rite 1 HP Dynamo Pump, 150 lb Pentair Sand Filter, Gorilla Pad,
    Foam Cove, Taylor K-2006 kit, BBB method, 8'X20' Fafco Sunsaver Hard Plumb, DIY Fountain, Margarittaville Fiji


    My Build: one-man-one-pool-and-one-deck-agp-pics-t37172.html
    My Build 'To-Do' List for other DIY'ers: my-pool-build-list-t40249.html?hilit=list

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    In the Industry

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    Re: Engineering for bad soil conditions/ various PB opinions

    What about a fiberglass pool?
    Over 30 years in the pool business
    We build vinyl, fiberglass, stainless steel pools
    Certified in Hydraulics

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    Re: Engineering for bad soil conditions/ various PB opinions

    Definitely want the gunnite. Like that above ground option - pretty sure it's against neighborhood policy!!
    20K gallon, 99' perimeter, IG Quartzscapes, Pentair FNS 60 SF DE filter, Pentair Intelliflo Variable Speed 3 HP pump, 400k BTU Pentair (NG) heater, Pentair IntelliChlor and SWG, Pentair Legends platinum cleaner with booster pump, Spa with rock spillway, 3' grotto waterfall, 12' weeping wall with Pentair 3HP WF pump, IntelliColor Pentair LED lights

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