Pool Side Warping

Dutchbuckeye

New member
Sep 24, 2019
1
Michigan
Ok. New to the forum. I have a 1970's above ground Kayak Pool. I did not buy the suggested retail Kayak pool sides when I bought this from a friend. I used the housing CDX Boards and painted them with a outdoor decking paint on the outside. I insulated and water-proofed the inside before putting in the liner.
Underneath , the lounge deck I have a bubble protruding from the wood. It is soft, and could break before next season. Wife thinks some 2x4 boards would hold it in place. I believe we need to buy a new liner, and replace the board.
Any suggestions? Thank you.