Thanks for the replies so far! The deck is going to be made up of three parts to fit round a conservatory - the main deck area is 4.6m x 2.8m, and there are then 2 'walkway' areas (for want of a better word) which will be 4.9m x 0.7m and 3.8m x 0.7m. The deck will be sunken below the garden level by about 2 feet (we have a raised garden compared to the house would be a better way to describe it) and butt up to walls on all sides.
Because of space constrictions it is not going to be possible to build a frame off site and lift it into place, it is going to have to be build in situ. I also have a height restriction due to the level of the doors in the house - the conservatory doors open outwards 6" above current ground level. Thus I can only have a 4" bearer below the deck boards which leaves me 1" for the deck board itself and 1" clearance for the outward opening doors. This necessitates a single layer support rather than the more traditional joists on bearers design.
Thus I have to make a lattice with the joists no more than 400mm apart (recommended spacings by the deck supplier) with 4 cross members 600mm apart. 400mm apart on the long axis means 10 joists, with 4 cross members = 60 butt joints. Thats just for the main deck area. Sorry if its not very clear, its easier to visualise than to describe!
Anyhow, redesign at a later stage is not an option - once its down it stays down so getting the nails out again is not necessary, I was just concerned as to whether they would be as strong (or strong enough) when compared to joist hangers.
I have 3 days off work next week to start this, so will try and take some progress pictures as I go along, but suspect it will take more than 3 days to complete so dont hold your breath for the final shots! On the plus side, I have managed to convince SWMBO that Western red cedar will be far nicer than the green tinted ribbed deck boards that are everywhere, so assuming the ship from Canada docks on time I should at least have some nice timber to play with!
cheers,
Steve.