Best way to finish deck edging on the diagonal?

Hi Folks,

I'm building a 'notionally' 4.3 x 6.6 metre rectangular & very low deck that has one corner - a triangle measuring about 2.3 x 1.7 metres - cut off on the diagonal. I'd like your advice on the best way to finish the diagonal edge. The boards run along the longer length. I favour using a matching face plate and have the boards overhanging by 5-10mm for drip purposes. I plan to install an additional bit of 90 x 45mm joist material along the cut-off diagonal edge to provide support for both ends of the deck boards and the face plate.

I guess I want to figure out whether I should restrict the screw fastening to where the boards cross the parallel joists, or should I also screw into this diagonal facing support joist as well.

Trying to visualise the screw patterns and appearance it seems to me that things could get quite 'messy' along the diagonal edge where the additional screws may end up irregularly placed. How do people generally approach deck edging and in particular finishing things off when shapes are less than regular and a diagonal is called for?

Any advice much appreciated!

thanks, Sam.