we are planning on building an oversized deck 50 foot long, 18 foot wide, 9 foot high

Using 2x12x18 southern pine decking joist.

Planning on spacing post 6 foot apart.

I’m looking for advice with design and materials to ensure a safe long lasting deck.

Thanks for any help.

closed as too broad by The Evil Greebo, mmathis, Daniel Griscom, ThreePhaseEel, fixer1234 Aug 15 '18 at 23:31

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Unfortunately your question is rather broad in scope and any answer regarding design and materials is subjective - ie - opinion based. This site focuses on specific questions with definitive answers. As such, opinion based questions are really off topic for us. – The Evil Greebo Aug 15 '18 at 11:54

Your local building codes will be the ultimate guide, and depending on your location, you'll likely need a permit and inspection as well.

This may help you with your estimating: https://www.awc.org/codes-standards/publications/dca6

Having just built a 16x12 deck ten feet off the ground, 50x18 would be lot of work and not cheap.

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