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I'm wanting to build a free standing, low-lying quarter circle deck to bear the load of a 1680kg spa (1680kg assuming that the spa is full of water and people) with a diameter of 1.9m. Each side of the quarter circle will be 3.9m long, so the curved section would also have a radius of 3.9m. The spa will sit in the back corner. Along the sides, I also want to build a privacy screen to reach 2.2m high from the level of the deck. I've checked my local and state planning codes to ensure I can do all this without a DA where I am located. I've attached a crude birds-eyediagram and 3D visualisation of what I'm wanting to do below.
My questions to the community are:
-Should I be running double bearers (currently opting for 120mm x 45mm MGP12 treated pine)?
-Best way to fix my bearers to posts, assuming I'm using double bearers - so far I plan to special order 150mm x 150mm F7 sawn pine posts and notching double bearers to both sit directly onto post, with 2 M12 coach screws to fix.
-Should I build my joist frame to sit ontop of my bearers, or would a low-lying, load-bearing deck of this scale be fine to use joist hangers?
-Can I use the same posts to hold my privacy screen and bearers? Assuming I am using 150mm x 150mm posts. I.e could I notch the bearers into the post and have it still be the height of the fence? Or do I need to lay completely seperate posts for the screen.
Thank you in advance for your time and help.
