Roof timbers for shallow pitch flat roof
 

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

Roof timbers for shallow pitch flat roof
 

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..

Roof timbers for shallow pitch flat roof
 

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.
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"