Design - Substructure

I thought that I would start with a 12x20 standard design. Which it turns out, is how I finished. In between I looked at lots of ideas. Half octagons, small protrusions for seating, 15x20. In the end, 12x20 worked out best for both the space we wanted and the construction that we thought we could take on.

Here is the design that I came up with using the deck building application on Lowes website

Lowe's Design PDF

After talking with the contractor sales guy at Trendel Lumber (who just happens to be my neighbor) we decided on a similar joist structure, but with a cantilever so that we only needed 4 posts.

This is what the substructure looks like now.