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Thread: New deck heaving

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    New deck heaving

    Hi,

    My 4 month old decking is already heaving in a large area and is heaving around the coping. It is pulling the mastic away and seems to be getting worse. It is upwards of 1 in now (see pic). Pool guy says this isnt "normal" but should resolve it self by Summer. I am not so sure.

    Does anyone have experience with this type of issue? Did it settle back down?

    (i live in the Dallas area)
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    Bill
    24k gallon; chlorine; gunite with stone scape mini;

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    pwrstrk's Avatar
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    Re: New deck heaving

    How have the temps been in your area ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: New deck heaving

    I don't think the ground freezes in the Dallas area. Am I wrong?
    Approx 11K Gal. 10'X30' Semi free-form IG - 6 ' raised spa w/6 jets - 10' circle sun shelf with 1 bubbler - Waterfall - 3 / 1.5 HP pumps - Polaris 280 Cleaner - 3 Pentair Color LED Intellibrite Lights - Pentair 400K Master Temp - 2 Valve Actuators - 5 Fiberstar Mini Laminars - 1 Fiberstars 2004 Illuminator - 2 Skimmers - 6 Returns - Caribbean Blue Pebble Tech - 600+ sq ft kool decK - Auto Fill - 2 Boston Acoustics VOYA RK5 Outdoor Rock Speakers - 2 TIC Corporation TFS5CN 6.5-Inch 150-Watt Terra-Forms Rock Speakers - Apple Airport Express - 1 Awesome View.

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    pwrstrk's Avatar
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    Re: New deck heaving

    You could be right. I haven't seen the temps in that area lately. Just throwing that out there.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: New deck heaving

    There was an ice storm that came through in early December. Temperatures stayed below freezing for over 48 hours, and there was ice on the ground for days. It is unusual for it to stay freezing here for as long as it did.

    Weather here is highly variable. This winter, we've had some lows around 19, and some highs in the 60s. Today the high was 66. Tonight it will drop to freezing, and the high tomorrow should be in the mid 30s with a low of 19.
    Outdoor 14,000 gallon IG plaster pool built in 2000 with spillover spa, 2 hp WhisperFlo pump with MagneTek motor, Sta-Rite cartridge pool filter with 300 ft2 filtration area and 0.33 gpm/ft2 filtration rate, Aquabot Rapids 4WD robotic pool cleaner, Raypak digital gas heater, and Intermatic mechanical timer located in the Dallas-Fort Worth metroplex

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    Mod Squad JohnT's Avatar
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    Re: New deck heaving

    I'm betting they used dirt to backfill and it is settling.

    Regardless, it's not going to correct itself.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: New deck heaving

    Quote Originally Posted by JohnT
    I'm betting they used dirt to backfill and it is settling.

    Regardless, it's not going to correct itself.
    ^^^^^ This is what I am thinking. It takes days and days for the ground to freeze. This will not auto correct itself.
    Approx 11K Gal. 10'X30' Semi free-form IG - 6 ' raised spa w/6 jets - 10' circle sun shelf with 1 bubbler - Waterfall - 3 / 1.5 HP pumps - Polaris 280 Cleaner - 3 Pentair Color LED Intellibrite Lights - Pentair 400K Master Temp - 2 Valve Actuators - 5 Fiberstar Mini Laminars - 1 Fiberstars 2004 Illuminator - 2 Skimmers - 6 Returns - Caribbean Blue Pebble Tech - 600+ sq ft kool decK - Auto Fill - 2 Boston Acoustics VOYA RK5 Outdoor Rock Speakers - 2 TIC Corporation TFS5CN 6.5-Inch 150-Watt Terra-Forms Rock Speakers - Apple Airport Express - 1 Awesome View.

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    Re: New deck heaving

    They used sand to fill.

    Another thing is that it started prior to any low temps. Sounds like I need to get them back out here ASAP.
    Bill
    24k gallon; chlorine; gunite with stone scape mini;

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    Re: New deck heaving

    Sand would not have been a first choice for back fill in my area but I don't know about Dallas.

    Regardless, others are right, it will not fix itself.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: New deck heaving

    Doesn't the Dallas area have some expansive clay soils? It is either settling because of improperly compacted fill or heaving due to expansive clay. It will not correct itself although if it is expansive clay it will move up and down with seasonal changes due to ground moisture. If it has moved 1" in four months that is pretty excessive.
    18' x 36' saltwater inground vinyl pool

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    Mod Squad woodyp's Avatar
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    Re: New deck heaving

    Been an awful lot of rain in Big D area over last 4 months though after a super dry summer. Almost got us back to average yearly rainfall levels! Still -7 on the year in East Texas.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Re: New deck heaving

    And yes, heavy clay soil is common in the Dallas area.
    Outdoor 14,000 gallon IG plaster pool built in 2000 with spillover spa, 2 hp WhisperFlo pump with MagneTek motor, Sta-Rite cartridge pool filter with 300 ft2 filtration area and 0.33 gpm/ft2 filtration rate, Aquabot Rapids 4WD robotic pool cleaner, Raypak digital gas heater, and Intermatic mechanical timer located in the Dallas-Fort Worth metroplex

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    pragmatic's Avatar
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    Re: New deck heaving

    Quote Originally Posted by woodyp
    Been an awful lot of rain in Big D area over last 4 months though after a super dry summer. Almost got us back to average yearly rainfall levels! Still -7 on the year in East Texas.
    Hydraulic expansion is my guess as well. I'm in SE Texas with a pool built in/after drought conditions-2012. My pool deck did the same thing after about 6 months at the union to the existing patio (even with re-bar tie-in). My PB came back and redid a 16-inch swath around the entire patio. Not an easy task, but we didn't feel the deck would correct itself. It's holding firm after 6 months.
    Dave My Pool Build, ODK Build
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    Re: New deck heaving

    Thanks everyone. The PB and deck guys are coming back out. I also can now see a very long (but small) crack in the aggregate. There is obviously a problem.

    We have had some abnormally cold temps here. My poor pool equip is working OT.
    Bill
    24k gallon; chlorine; gunite with stone scape mini;

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    Re: New deck heaving

    Any update on this?
    18' x 36' saltwater inground vinyl pool

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    Re: New deck heaving

    Saturated sands don't heave, they only settle if they haven't been properly compacted. However, expansive clays which Texas has plenty of do heave when saturated. Did you see them place the backfill? Could they have cheated and re-used some on-site material?
    DIY 28x38x18 Full L, 26,000 gallons, Pentair VS Pump, SWG, CCP 420 Filter, Sta-Rite Max-E-Therm SR400HD Heater, EasyTouch Controller

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    Re: New deck heaving

    All dirt was already removed. i only saw sand and then rebar. Not sure what they did prior to that. Deck guy came out. Claims the heave is normal. Agrees that the mastic needs to be fixed or it will just get worse as water/moisture continues to go down under the concrete. Claims the crack is only superficial and is normal. I told him it was unsightly and that the work was not proper and i should not have to look at it. He didnt agree or disagree.

    He is meeting the PB owner at my place next week to review. I told them both that i know heave happens but this is to much too soon. I dont think i am being unreasonable here. I have another slab poured right by the heaving deck and it has not heaved in over 2 years so i am not sure we can blame the clay.
    Bill
    24k gallon; chlorine; gunite with stone scape mini;

  18. Back To Top    #18

    Re: New deck heaving

    More heave with wet and cold weather. PB, concrete contractor, sales guy, all say nothing to be done and is to be expected. Frustrating but my only hope is that it settles over the summer.

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