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Thread: Concrete pool with Fiberglass walls leaks now what ?

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    Join Date
    May 2013
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    Richland,Michigan
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    Concrete pool with Fiberglass walls leaks now what ?

    So I live in Michigan and have owned our pool for just over two years with pretty good luck so far.
    Well we noticed the winter cover was pretty low in the pool so I removed it today.
    Water level is about 16 inches below where it was in the fall so pretty sure it leaking.
    Unfortunately the inground pool is old guessing 30 yrs.

    Water level is at pool light level so that is my first thought to check that for leaks.
    Also the fiberglass walls are looking tired an have some hairline cracks and one spot that has a old repaired crack that is most likely failing
    but is above the water line as it sits right now.

    I'm pretty good at construction and not afraid to try and fix things on my own so questions are.

    Best product to repair/caulk pool light ?
    Best way or product to seal hairline cracks ?
    Best way or product to seal a foot long larger crack ?
    Also if I'm doing all this I would like to redo the caulk that they have where the fiberglass walls meet the concrete bottom.
    What caulk would be recommended for this ?

    Thanks
    jp
    30x18 Gunite inground pool with fiberglas side walls, 20k gallons, Sta Rite Sand filter .75hp pump

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    cowboycasey's Avatar
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    Re: Concrete pool with Fiberglass walls leaks now what ?

    JP, all wonderfull questions, Being you are from michigan my recommendation would be to find a fiberglass boat repair facility, they have the tools and know how to fix fiberglass.. now, can you do it, yes look at the many videos on repairing fiberglass boats, your pool is the same thing, your just holding water in and boats hold it out

    make sure you know what the water level is under your pool before you empty, any pool can pop out of the ground when emptied (remember its a boat)
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    twinkiesmommy2009's Avatar
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    Re: Concrete pool with Fiberglass walls leaks now what ?

    And post pictures and progress!!


    Started 5/31/16. 38'x23', 618 sqft., <14,000 gallons, 8' spa.Travertine coping. Raised beam w/3 sheers. Large sunshelf w/3 bubblers. SWG IC40, Pentair VSP, 520 cartridge, color LED lights, Easy-touch, screen logic, Maytronics S300i robot, and Wet Edge Prism Matrix finish (Deep Sea Blue with Indigo plaster). Build Thread: Another in Texas - Cypress Texas | MUD District | HOA Approval | Great Escapes Pools

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    Re: Concrete pool with Fiberglass walls leaks now what ?

    CC, Thanks for the boat repair idea. I don't mind paying someone who can do a nice job. So will look into that.
    Figure I would use AB Putty for the light. I haven't open it up yet but water level is about 2 inches above the bottom of light and has not leaked any more.

    I still would like to get a name of a good/really good pool caulk to redo the seam where fiberglass wall meets the concrete floor.
    So if anyone could recommend a one,would be grateful.
    Will try and get some pics up soon.
    30x18 Gunite inground pool with fiberglas side walls, 20k gallons, Sta Rite Sand filter .75hp pump

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    Re: Concrete pool with Fiberglass walls leaks now what ?

    I too vote for boat repair. Also fiberglass pool installers though they may balk at the work. They may know the best product to seal the bottom side joint.

    Don't get to far ahead of yourself on the light. In your case (and in most cases) the leak is in the niche itself, not in the conduit. Conduit properly installed is vey resliant stuff and is generally not the source of leaks. Its the niche or here where the fiberglass meets the niche. Is there concrete behind the fiberglass.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: Concrete pool with Fiberglass walls leaks now what ?

    So after three weeks of rain and another three weeks waiting on a pool guy to show I ended up fixing the pool cracks myself.

    I used 3M 5200 adhesive caulk on all the cracks. Worked pretty well and was easy to use. Stuff is strong as h*ll and can cure underwater if needed.
    The cracks around my skimmer I fiberglassed and went over the top of the new fiberglass with more 5200. Looks pretty good all things considered.

    So far so good. NO Leaks. Need to float around with a cold one to make sure its all good.

    Oh I also redid the bottom of the wall where it meets the concrete with new Permaseal caulk.
    30x18 Gunite inground pool with fiberglas side walls, 20k gallons, Sta Rite Sand filter .75hp pump

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    cowboycasey's Avatar
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    Re: Concrete pool with Fiberglass walls leaks now what ?

    That 3M 5200 is crazzzzzy isn't it, it becomes part of whatever it stick's to forever
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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