Examples of projects we added a new spa to an existing pool:
Lincoln/Larkin
Weeks
Basically, you have to build the spa wall butted to outside of the pool beam. Then add the thickness of the pool beam - so you might end up with a 1'-8" thick spa beam
Technically you just need to do that on the pool side, but it can look a little weird to change the wall thickness depending on the spa shape.
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