Thanks for the info so far. I have no intention of not doing it right,
I just what to know what part of right I have to do. Being more
specific, the current span of garage roof is 6.6m, on 4x2 timber (sorry
to mix units but thta is what size they are.). The joists are at 36cm
(14in) centres. I doubt that these are large enough to be a floor so
options are, bigger joists, (if so what size ), or an RSJ at mid span
(There are brick pillars on the garage wall at mid points thos that is
a clear option). If an RSJ is the best option by reducing span to
around 3.5m will the 4x2 serve or do I still need new joists. I have
tried superbeam, but I only have an iMac so the programme does not
work. Could anyone help by giving me an idea of the RSJ and joist
sizes. I will be using an engineer eventuallly but wanted to get a
feel for the size of the job first. (Knowledge is power etc) Thanks
very much - Lloyd