Insulation Question

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I am building an above ground pond. I am using 4x4 timbers. I left the bottom bare. The pond is on a concrete slab. Should I put some kind of insulation on the bottom, under the liner? It does get in the mid to high 30's in the winter in Northern California.
 
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Insulation won't help any. The ground is fairly stable temperature wise.
All insulation does is slow down the transfer of heat (or cold).
Moisture and mould should be your main concern. It depends on your design.
 
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This is my design. 95% of it is covered from a gazebo.
frame.jpg
 
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“Mid to high 30s” - so summer year round then? ;)

Nice looking pond! Now let’s get some water in there!
 

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Not sure but looks like mostly shaded and cold may transfer from the large slab most of the year .Not just cold but heat also .I would put something on the bottom between the liner and cement .Plus I found out hard way how epdm liner sticks to cement slab ,but it was in sun .It was like soft glue and left a mess on the slab when my sister and I had to remove it .
 
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Not sure but looks like mostly shaded and cold may transfer from the large slab most of the year .Not just cold but heat also .I would put something on the bottom between the liner and cement .Plus I found out hard way how epdm liner sticks to cement slab ,but it was in sun .It was like soft glue and left a mess on the slab when my sister and I had to remove it .
I have an underlayment that I am adding to it.
 

sissy

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underlayment did not help my sisters .I only had pieces to put down from when I rebuilt my pond but since it was mostly in sun everything just melted
 
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underlayment did not help my sisters .I only had pieces to put down from when I rebuilt my pond but since it was mostly in sun everything just melted
Was your sisters pond in direct sun? Min is under a cover. (Gazebo)
 

sissy

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no it was in sun most of the day and it can get really hot here .We had to move it because she was having a new heat pump put in and it was move that or a big concrete table and bench's
 
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We get triple digits for about 30days in the summer. I will most likely put some plywood on the concrete.
 

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You may have a problem with termites or ants with wood under there a moist area and wood not good
 
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Good point. My frame is 4x4 timbers though, really doesn't matter. What about sand? Im not worried about ants or termites. We have a pest control company that sprays our property.
 
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moisture will get below the liner and the concrete regardless of how careful you are eventually spilled water or moisture from the air will get under that space and mold can become an issue. drain lines cut into the concrete will do a lot to help alleviate moisture build up
 

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