I plan to recess a hot tub into the deck. 230x230cm. I was thinking of supporting the joists around the hole. Build a 230x230 frame from 170x45 joists. Cc50 and a bunch of noggins. Screw 80mm. Drill into the rock about 18 post shoes that the frame rests on. Then decking on the frame and insulation. Will this hold? I don't know how to calculate this.
