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Thread: Foam board bottom

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    Foam board bottom

    Hi 😊. Just joined today. Have a 22'x54" Coleman still in the box. Trying to get ground and 12"x12" concrete footers level. Read all of the posts on foam board bottoms last year. Sounds like a good plan to me. But I think I bought the wrong boards. I have 3/4" x 20 1/2" x 8' white styrofoam boards. Before I go to all the trouble of taping them together please let me know if I need to get different boards. Thank you!
    22'x54" Coleman above ground pool

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    Aug 2013
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    south east Arizona
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    Re: Foam board bottom

    20.5 inch? That is going to be a lot of tape! I think people use something other than what I did but mine are the white styrofoam boards with mylar on one side. I used inch thick 4 x 8 ft and probably wouldn't bother to use it again unless maybe I was installing on concrete. I am not in the majority here about padded floors. I just don't like it. I would use a gorilla pad or other protector but don't care for the "cushion" sensation.
    somewhere around 6,800 gal 18 x 4 foot round Intex Ultra Frame AG, finished filling August 29, 2013. toy pump w/ "A" cartridge up and running next day --- July 2015 upgraded to Krystal Clear 3000 GPH pump and 16" sand filter --- May 2016 Intex auto cleaner and in July salt system and Hayward skimmer

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    scout123's Avatar
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    Re: Foam board bottom

    You want to use the extruded polystyrene (XPS) and not the expanded(EPS). I believe the XPS comes in the different colors. The EPS is not as waterproof and can crumble around the seams or corner.
    12x30 Intex prism frame. 1600 gph Intex sand filter/pump with saltwater system. Temporary fencing around pool for safety. Taylor K-2006 and K-1766 test kits.

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    Richard320's Avatar
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    Re: Foam board bottom

    The stuff you want is going to be blue or pink and it's like one gigantic pellet. It's just one piece. The white stuff is called bead board and you can usually see where the beads were smashed together. They come apart.

    Not sure what it's like in Florida, but that extruded stuff is really hard to come by in SoCal. If you can't find it, then you won't have much choice but to use the bead board. I'd trim it real close after the pool is filled, so nobody steps on it and starts breaking it up.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Foam board bottom

    Thanks for your reply ��. Yes I'm thinking it's going to be a whole bunch of taping. These are just plain white styrofoam boards. Pool is going in back yard - no concrete. The biggest draw for me to using styrofoam was the smooth bottom - no footprints to try to vacuum

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    And that was supposed to be a smiley face - not sure how I got 2 question marks?
    22'x54" Coleman above ground pool

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    Re: Foam board bottom

    Thank you! I will try Lowe's and Home Depot again. I went to one and the guy who helped me just thought I'd lost my mind (from the look on his face) and said they didn't have what I was looking for. I do plan to cut/tape together so that it just fits under the pool. I also purchased roofing felt for one layer and enough weed proof to do a layer under and a layer over the foam boards.
    22'x54" Coleman above ground pool

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    Richard320's Avatar
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    Re: Foam board bottom

    Quote Originally Posted by Denita H View Post
    Thank you! I will try Lowe's and Home Depot again. I went to one and the guy who helped me just thought I'd lost my mind (from the look on his face) and said they didn't have what I was looking for. I do plan to cut/tape together so that it just fits under the pool. I also purchased roofing felt for one layer and enough weed proof to do a layer under and a layer over the foam boards.
    I just saved you some running around. Lowes only has 1/2" in stock. Home Depot has the 1". This stuff: Owens Corning FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing-20WE - The Home Depot
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Foam board bottom

    Thank you! Thank you! Thank you! ��

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    Again - supposed to be a smiley face lol not question marks
    22'x54" Coleman above ground pool

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    Richard320's Avatar
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    Re: Foam board bottom

    Quote Originally Posted by Denita H View Post
    Thank you! Thank you! Thank you! ��

    - - - Updated - - -

    Again - supposed to be a smiley face lol not question marks
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Join Date
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    Glen St Mary, FL
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    Re: Foam board bottom

    Thank you
    22'x54" Coleman above ground pool

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    scout123's Avatar
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    Re: Foam board bottom

    Just an FYI, I know a lot of people recommend using the gorilla tape for the seams. I love the foam bottom. It does keep it smooth, but it's also comfortable to walk on. I like the cushion feel to it.
    12x30 Intex prism frame. 1600 gph Intex sand filter/pump with saltwater system. Temporary fencing around pool for safety. Taylor K-2006 and K-1766 test kits.

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    Moses Lake, WA
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    Re: Foam board bottom

    Either the XPS (usually pink or blue) or EPS (white) will work. XPS has a slightly higher density (Foamular 150) than EPS, but only a couple of psi.
    Both are manufactured from the same material (polystyrene resin) through different processes, both are closed cell and both will work below grade, so moisture won't degrade either, though some brands of eps foam will absorb more water. Sunlight (UV) will degrade both, though, so you either want to cover it or trim the exposed areas. Home Depot sells a brand of EPS foam that has a reflective film on one side and an opaque film on the other that protects the board.
    Brian E

    Intex 12x24 pool

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    Re: Foam board bottom

    I got iron grade duct tape. Is the gorilla tape better than that or are they about the same?

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    Thank you!
    22'x54" Coleman above ground pool

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    south east Arizona
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    Re: Foam board bottom

    I am not sure on the tape but folks around here recommend 3 layers of whatever you use, I used gorilla and only did one layer. I have some lines where my foam separated a bit but I don't really care (and I have the "wrong" kind of foam so...)
    somewhere around 6,800 gal 18 x 4 foot round Intex Ultra Frame AG, finished filling August 29, 2013. toy pump w/ "A" cartridge up and running next day --- July 2015 upgraded to Krystal Clear 3000 GPH pump and 16" sand filter --- May 2016 Intex auto cleaner and in July salt system and Hayward skimmer

  15. Back To Top    #15

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    Glen St Mary, FL
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    Re: Foam board bottom

    Thank you all SO MUCH for your help. Home Depot is delivering the 'right' foam board today. I will do more than one layer of tape and I'm sure I will be back soon with more questions . Have an awesome day!
    22'x54" Coleman above ground pool

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