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

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..

On Mon, 1 Sep 2008 15:12:11 -0700 (PDT), a particular chimpanzee,
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.

Assuming access for maintenance only, and assuming you're at less than
100m above sea level:

At 600mm C/C: 38mm x 147mm C16, 63mm x 122mm C16, or 47mm x 122mm C24.

At 400mm C/C, 47mm x 122mm C16's will span 2.48m.
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