Spa Deck Support Requirements
Hole in Deck Where Spa Was Located
I am working on relocating my spa from it's existing "below ground" location, to an above ground deck.
Actually, I am replacing the current spa with a newer one, and do not want to encounter the same nightmare situation that I recently did when a pump needed replacement.
I have removed the old spa from the hole where the builder had installed it, and would like to build a deck over this hole to support the new one. The hole itself is 12' x 12' square.
I would like the deck I am building to be slightly larger at approx. 14' x 14'. I would like the top of the deck to be at a comfortable "one step up" height of approx. 8"-10" above the existing kool-deck surface. I would like to use the composite lumber material available at my local builders supply.
The manufacturer of the new spa has stated that the total weight, including the spa, water and occupants, would not exceed 4000 lbs. The shape is octagonal, and is approx. 7' side-to-side.
My questions are:
Would a frame constructed from 2 x 8's around the perimeter, and 2 x 6 joists at 16"o.c. be adequate to support this load?
Could this framework be set directly on the pool deck? If not, can you suggest a better design that will be better structurally, while providing the same basic appearance?
I have attached a very elementary sketch of the layout I am working with. Thank you very much in advance.