Hi All!
I'm building a low level deck in the backyard and wanted to run my framing plan past you all to see if anyone had any ideas and or feedback.
The decking material is Ekodeck, which comes in 5.4m lengths that re 137 wide - plus 6mm spacing between boards.
The design constraint is that I want one level of joists with no bearers. The deck will be at the higher end of the garden, so setting the posts back from the edge and cantilevering the double joists will allow the deck to appear to float. So I'll be framing with 140x45 MGP10 H3 treated. Looking at the span tables, I see a max span of 2600mm with a max cantilever of 650mm.
With that in mind, do you think the below plan will work? That is four posts supporting double structual joists of 2x 140x45x2600. These run out to edge joist also of double 140x45. Basically these doubles provide the structure that the remaining 2600 joists hang from. The left and right edge joists are blocked out to 135mm in width to allow for pictureframing - the decking overhangs the frame by 25mm all around, to allow for a fascia board to conceal the joists.
My intention here is to maximise the deck size with the simplest joist plan. I expect to the 2600 single joists to have a little bounce in them, but the nogs should cut that out. All joints will will have glavanised hangers or angle brackets as appropriate.
