Sand vs. Styrofoam w/above ground pool

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  #1  
Old 07-07-04, 11:22 PM
calvin
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Question Sand vs. Styrofoam w/above ground pool

I'm planning the installation of a 21 ft round, above ground pool.
The directions mention that styrofoam may be used instead of
sand for the base under the liner. It is referring to the whole
bottom, not just the cove.
What are the advantages/disadvantages that styrofoam would
have when compared to sand?
What types of styrofoam would be best?
Should there be at lease some sand under the styrofoam?
Has styrofoam been used for pools long enough to determine
if it can stand up to the test of time?
Thanks.

-calvin
 
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  #2  
Old 07-08-04, 09:36 AM
Ed Imeduc's Avatar
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Id go for the sand there .That way you can just form it up for the round cove, that you have to work in there around the bottom of the pool.


ED
 
  #3  
Old 07-08-04, 08:54 PM
calvin
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Ed,

Thanks for the input. It seems that styrofoam is not that common
and sand has been used for many years.

-calvin
 
  #4  
Old 07-30-04, 02:02 PM
dgroat
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Too late to help?

I thought the styrafoam would have been the best choice on my last pool, but it was an additonal $400 I just didn't have. You need the heavy dense type not the cooler type.

The difference is that the sand gets lumpy after awhile. The styrafoam would be a smoother bottom and a lot less work then sand. You still need a berm. One company I talked to had a styrafoam berm in their kit. Otherwise you still have to add a sand berm around the top of the styrafoam.

Had I gone with the foam I had planned on using about 3" of sand just under it for leveling purposes.

Good luck.
 
  #5  
Old 07-30-04, 08:39 PM
calvin
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dgroat,

Thanks for your reply. Given that you were to have 3" of sand under it,
did you plan on a thin layer of styrofoam?

I'm not familiar with the term "berm". I assume it is the area where
the pool bottom meets the walls (cove).
 
  #6  
Old 07-31-04, 07:18 AM
Ed Imeduc's Avatar
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I'm not familiar with the term "berm". I assume it is the area where
Right---- You want a nice curve in it for the liner to go over.

ED
 
  #7  
Old 08-13-04, 02:32 PM
dgroat
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Berms and stuff

The berm is the triangular shaped edge around the base of the walls so there is not a sharp "corner", and keeps the liner from "blowing out' below the bottom of the wall.

Its not required but I also recommend a berm around the outside wall as well to help keep water from undermining the outer wall.

The styrafoam is about 2" thick. You will know it when you see it. Its heavy and dense enough that you can walk on it without it denting much. However, having had a couple different pools over 6 years, the sand works fine. If your estimating how much, go with more than you think. Same on the berm. Its really difficult to add more sand later.
 
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