free standing 10' x 14' deck w/building
I've got the CEO's approval to build a 10' x 14' roll-off roof observatory in the back yard on our hill top.
I was wondering if this structure could be supported by six 10" sonotubes sunk to frost depth (shown as "X" below). I was thinking to stand 6x6 posts on those six concrete footings, holding up two 4x12 beams as follows:
Then I was going to put 2x10 joists 16" o.c. on top of the beams and use 2x6 cedar as a decking from front to back.
Is this adequate support for a 10x14 freestanding deck? Even if I then build a pretty light building on top of it? (6'5" 2x6 walls all around)
Thanks for any insight