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Hot Tub Foundation

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Drifter:
Here's what you should have. either 4 x 4 or 6 x 6 or (I used cinderblocks) sitting on the slab. Next you need to have an even distribution so you need wood. 5/8 plywood will not do it. Get 3/4 inch "marine" grade plywood. (about 80 a sheet compared to 25 for plywood) You'll only need 2 sheets.  The marine grade is ment to handle the wet conditions and outdoor life.  My tub sits 18 inches above the deck. The dealer tried to tell me they wouldn't honor warranty because they never saw that method before. I then asked him if sitting on top of deck was ok. He said yes. I said, well deck is usually 12 -16 inch on center with decking material. The cinder blocks I used are 9 inches apart and the Marine grade plywood is stronger that most decking. He conceeded same and finally agreed my installation was acceptable. (BTW it wasn't my idea I got it from a very reputable Sundance dealer) Good luck!

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