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Having A Rest
Decking should be secure, attaching one member to another in various forms of secure and strong ways that engineers have spent a lot of time thinking about, designing and manufacturing.  There are reasons for that!
Deck codes change all the time.  They do because, typically, there is an accident due to insufficient attachment, overload or just poor construction.  Then thinking changes and they decide to change the standards to include stronger, more or different stuff!
But, everything now, from top to bottom, is securely attached to something else.  Secure attachment does not include toe nails, or one member merely resting onto another, no matter how strong that supportive structure may be.
One thing decks are not made for is the HOT TUB.  Hot tubs are heavy! 
I understand that a hot tub that is 84"x84" can hold between 400 and 500 gallons.  If I remember my 7th grade science, a gallon of water weighs 8.33 pounds.
A small fiberglass hot tub with jets can weigh 300 pounds or so.  A fancy one made for 6 or 8 people can weigh 1000 pounds, empty!
ADD IT UP!  HOT TUBS FULL OF WATER AND PEOPLE ARE VERY HEAVY! 
Let's say you have an ... more

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