Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Decking and patterns
Boards, patterns and joist spacing. 7 lessons.
Board thickness sets joist spacing. Change it. Match these boards to a joist spacing they can span. 
Diagonal boards pull joists closer. Change it. Lay these boards on the diagonal without letting them span too far. 
Blocking under a picture frame. Click the fault. Click what this border is missing, then add it. 
Composite follows its own report. Change it. Set the joist spacing these composite boards ask for. 
Gaps let the water through. Change it. Set the gap so water drains off the joist. 
Where board ends meet. Change it. Arrange the board ends so every joint is carried. 
Screws, clips and nails. Change it. Pick a fastener that stays put as the boards move.