robgraham wrote:
Can someone give me some guidance on what timber size I should use for
a felt roof with the following measurements :-
Span - 2.5m
Length - 4m
Angle - nominally 10 degrees
Covering - Sterling board and felt + insulation.

I'm assuming 600mm between centres.

Many thanks
Rob

Total guess but I'd use 6x3..or bigger

4x2 seems to sag under its own weight at that sort of span..