Not enough info to give you a definitive answer. Are the joists 2 x 6
or 2 x 8 or 2 x 12? What is the weight of the tub with water and naked
Once you figure that out you can figure how many 4 x 4 to add, with
proper footings of course. At the minimum, I'd put one at each corner
and one in the center. You may need more.
Hey, I'm a Canadian, we don't abuse each other for making a typing error. I got my measuring tape out and the deck is 10 ft 3 inches wide and 14 ft 5 inches long.
One side (the side where the hot tub will be) is attached to the outside wall of the house.
The joists underneath are 21 inches apart. The other side is secured by 3 4x4 posts evenly spaced. Their website says it weighs 1972 lbs.
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