[header] How to build a swimming pool from wood and plastic [title] Build braces for the side of the pool by placing two pieces of wood the length of the pool on the floor. [step] Find out what height you want the pool and then cut wood to that length minus the width of the 2 " by 4 ". [title] Screw the pieces into the wood at minimum 1' distances and maximum 2' distance. 
[title] Repeat step 1 and 2 until you have 4 braces like this. [title] Cut 4 pieces of plywood to the height and length of the braces.