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Thanks for all the advice. So having taken into account buildings regs, proximity to boundary etc the clear span of my roof will now be 2.9m. Will 6x2 or even 4x2 rafters be suitable as I think 8x2 may be overkill? I've also decided to stick with cladco roof sheets and ensure shed is well...

Hey catlad, Thanks for purlin info but as for sheet condensation I never gave that a thought. MrPlank - You experienced any condensating issues with your build? Apologies for all the questions but as a DIYer embarking on a large costly project I want to ensure its fit for purpose.

Great stuff MrPlank, that's what I'll prob opt for as it’s tried and tested by your good self! With regards to the Cladco box profile I was gonna use 2” x 1” for purlins running across the joists at 600mm centres as only carrying weight of sheet. Would this suffice or should I reduce to 400 or...

Hey MrPlank, I’m planning on building a similar shed/workshop in my garden with exactly the same span as you mentioned above. Just wondered if you completed the build and what spec you went for (timber size and centres). I’m planning on using the Cladco box profile too. Cheers