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According to the table in the 2012 IRC code a exterior deck needs to handle a 60lb per sq ft (40 lb live + 20lb dead load). Most treated lumber that I am aware of is #2 southern yellow pine, using that criteria on the table in the code book, your joists can carry a 10'-9" span. The biggest failure in deck construction has not been the posts or the joists, ...


The slope or pitch of the under panels can be at any degree that will shed the water. If you consider it as similar to a roof than according to Code: "minimum slope is 1/4 inch vertical in 12 units (2% slope)" and ideally :"1/2 vertical in 12 units (4% slope)". This is for metal roofs that have a sealant between their lapped seams. My only suggestion would ...

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