when we built a house for a customer a couple years back they wanted a large hot tub on their deck (like a 12 man i think it was). when it was all said and done (after the engineer finally signed off) the deck was built with 1 3/4"x 16" LVL beams every 12". it looked like HUGE overkill to me but im not an engineer either. the deck was about 14' by 18' and stood about 10' off the ground. i cant remember exactly what was done for footings under the deck but im sure it was just as extreme. good luck with the build!!
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