I have a 27' AG round pool and the liner is tired and leaking and will be replaced. I have read the posts in the forum about various foam bases under a liner. I already have sand, but like the thought of a flat foam bottom. If I smooth the sand and remove some for use as coving can I use 1/4" or 3/8" fanfold? I see that happy bottom is only 1/4". When I do research online it seems as though even 1/2" Dow blue board is equal in price to using Happy Bottom. Also could laminate foam underlayment be used for the pool walls???
Scott