Ok, I'm getting sorted to build this deck now the days are getting longer. A few Qs before I order the wood...
Deck is to be 5.5m * 3m ish. Covering a existing concrete area that slopes down to one corner and isn't particularly flat at all. Plan is to build a frame that sits on the concrete at the front and them is supported with a few small brick piers towards the back. Height of the piers at the back will be about 3 bricks or so. Given SWMBO wants a pergola on top of this I'm thinking of building small piers with a slab on top at the points where the 6 pergola uprights will be and then standing the pergola on these. This means I don't need to faff making the pergola uprights all different lengths (assuming I get all the pads level :)). Will then sit the decking frame on top of these as well - with some intermediate supports for the frame as needed (pergola uprights will be 1.8m appart).
Most places seem to suggest 150x50 joists. A couple say 100x50 will be ok. Assuming I go with 150x50s how frequently will they need supporting?.
Similarly, how frequently do I need to place the joists? I'm probably going to go with http://preview.tinyurl.com/jibble which have a finished sized of 34mm x 120mm so reasonably thick boards. Seems recomendations are from 400mm to 600mm centres. Any one with experience suggest what would be best? I don't want to end up with something bouncy :) Noggins every how far?
To build the frame I'll use the turbo golds that Dave recommends - drive them in with no pilot hole? Or would nails be a better bet?
Finally, once this thing is build any recommendations for coating it? Or best left alone to age? It's all pressure treated softwood...