On Sun, 7 Jun 2009 13:12:59 -0700 (PDT), RubberBiker
wrote:

High winds can exert a great deal of force

I had planned to make sure everything was fixed well but hadn't
realised wind could snap 2x2. I have taken your advice on board and
will now use 4x2 instead.

50 * 50 mm will flex too easily.

I had not realised that. I thought it was strong stuff.

Noggins are important to stop the joists twisting, and greatly stiffen
the overall structure - put them at 1.2m spacings along the joists.

Just screw them in?

Thanks.