Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Hot tubs and heavy loads
Where the span tables stop. 5 lessons.
A hot tub on the deck. Change it. Put a hot tub on this deck and get it approved. 
Tub on the ground, deck around. Spot it. Frame the deck around the tub so it can still be serviced. 
Power and heat for a tub. Change it. Plan how power and heat reach the tub before the frame closes. 
A roof over the deck. Change it. Add a roof over this deck and get it approved. 
Barbecue islands and fireplaces. Change it. Set a masonry barbecue island on this deck and get it approved.