Backfill Question

robamato

Member
Jun 6, 2010
14
Clayton, NC
It seems like the one consistent thing among all IG Vinyl kit makers is that you cannot use expandable material to backfill the overdig. Unfortunately that includes my central NC heavy clay dirt.

Why is it that expandable material cannot be used? Is it prone to swelling and exerting too much force on the pool wall? Thanks.
 

duraleigh

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Apr 1, 2007
31,682
Sebring, Florida
I didn't follow the link above but the soils here in NC are not very compactable....cracked concrete decking soon follows.
 

robamato

Member
Jun 6, 2010
14
Clayton, NC
Great article! My main concern was whether the expanding soil would damage the pool wall, but it looks like the main problem is deck related. I plan on building a wooden deck anyway so I think I'm OK to use the clay dirt as backfill.

However, I will install a drain at the bottom of the overdig as well as use sono-tubes to pour piers in the overdig to build the deck on.
 

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