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Thread: Question concerning pond insulation

  1. #1
    ceejay4801 is offline
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    Unhappy Question concerning pond insulation

    When insulating around the pond will it make a difference wether using open cell or closed cell insulation. I am wondering about the static pressure collapsing the open cell against the sides of the walls over time.

    I am considering using the 2 inch open cell polystyrene and was wondering if this will collapse to less than an inch and allow the liner to touch an errant screw or nail that is not properly set and if it could cause a tear.

    This is on a QT tank 10L x 5W x 4D 2 feet above ground.
    Is this a concern or am I worrying about nothing?
    Do I need to use closed cell and make it 2inch by using overlapping sheets of 3/4 inch to achieve 2 1/4 inch?

    Any one who has torn down a pond with this insulation notice any problems using the open cell type?

    I will probably be building in the next week or so. I would appreciate comments or any experience with using this insulation.

    Thanks
    Charlie

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    Steve511 is offline
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    Not sure about the specifics of pond applications but as an insuator, I would opt for closed cell. Open cell will absorb moisture and act as a sponge. Closed cell also has much better structural properties which i suspect is fairly desirable. Closed cell also has around 2x the r-value per inch. The bad news is is also 2x the cost.

    Good Luck!

  3. #3
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    I would just wonder about the purpose of the insulation. I doubt that it will accomplish very much at all unless the surface is covered also. Just like a hot tub.
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    If this is an above ground structure, wood framed or block, then it might not make too much difference. If it is below grade, the open cell will allow water into the cells, completely nullifiying any insulating properties. Trapped air is what is needed for insulating values.
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    In an above ground QT, unless you insulate/cover the top, don't see much good in insulation the walls since most heat loss it going to be straight up. That's why houses have much more R value in the ceiling as compared to the walls.
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    Hi Charlie,

    I've used this 1/2" poly insulation,

    http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053

    on my pond not so much for the insulation value but for the protection from sharp edges. It doesn't seem compress much at all. I also used it on my parents pond three years ago (both ponds are concrete block) and no issues so far.

    Good luck.

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    ceejay4801 is offline
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    Thanks to all who have replied...
    This QT will be made of wood and 1/2 way under ground.
    I will have insulation in the walls and the poly insulation is for liner protection primarily and secondary is if I get some R value out of it so be it.
    I will have a cover on it during the real cold months. Where I live sometimes we have real cold for a very short time. So I was preparing for that.
    I plan to have a plastic (6 mil) liner to hopefully stop water from getting to the insulation.
    I also will have an old pond liner under the insulation as well to try and help protect the new liner.

    Mostly I want the insulation to prevent the liner from contacting the wood or a screw/ nail head so that I won't get a tear in the liner. My worry was that if it picked up water and compressed would I just be wasting my time and money on the insulation.
    If I am wasting time and money on this step what would be better solution?

    Thanks
    Charlie

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    Quote Originally Posted by ceejay4801 View Post
    Mostly I want the insulation to prevent the liner from contacting the wood or a screw/ nail head so that I won't get a tear in the liner. My worry was that if it picked up water and compressed would I just be wasting my time and money on the insulation.
    If I am wasting time and money on this step what would be better solution?
    An underlayment of old carpet would protect the liner. I think the insulation is of little value.
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