I recently was given a 1 yr old hot tub. Im building a platform in my walk out basement for it. I wanted to pour a slab but i was vetoed.... i will attach a couple pictures. The platform will be 9 x 9. Full the tub weighs 3700 lbs and is 7x7. Plan on 1000 lbs for people. I have 3 beams. Each has 2- 2x6s on a notched 6x6 posts. So there is a 6x6 every 4.5' north south east & west. we want it as low as possible for privacy reasons. If i run 2x4 joists every 6" will that be adequate for bearing the weight? That would be 20 over the 9 feet with the 2 outsides being doubles. Beams under the ends and the middle at 4.5 feet. Should i run 2 more beams inbetween the 3 i have already?
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