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Currently planning a workshop shed and was wondering the recommenced joist distances to make adding insulation easy. I know it has been mentioned before but now can't find it.
Also what wood do people recommend, sawn, C16, etc. Treated or untreated.
i made framed mine to fit 50x450x1200 celetox sheets
The spacing is normally dictated by the other materials. 600 (or 400) if dry lining, 610 if fitting plywood/OSB. Insulation is easy to cut or squeeze in.
Treated timber if you can get it for not much more. The finished stuff is nicer to work with than sawn but not much in it and makes little difference once up. Again depends on price.
I was going to use cls, but after talking to timber merchants got 2x4 treated for about 15% more which made it a no-brainer for me. Work out quantities needed and then call yours. I was surprised at discounts available.
Good luck and enjoy! Very satisfying project. I've since done a couple of pieces of furniture which have taken nearly as long as the full shed!
I'm building a 5x5m one at the moment and have 4x2 joists, 15 degree pitch, with the joists at 1.2m spacing. Basically one at each edge of and 8x4 sheet of 11mm OSB, I have a single purlin running between mid board. I don't think you could go any skinnier than that, but it's stron enough to take my weight. With hindsight 18mm OSB would have been better, but I was bulding on my own so hauling those sheets onto the roof would be PITA.
If you fall through the roof add some more joists!
I've used 4x2 for the joists, 3x2 for the framing all treated C16/24.
I built a 10' x 12' the last year, used C16 4x2 for the floor and C16 3x2 for everything else, I put them at 400mm centers, didn't insulate it but wrapped the frame and roof with Tyvec before I clad it then boarded the inside with 9mm OSB.
1.2m centres on roof joists 😯
That's a little bit on the tight side and that's coming from a builder who's paid to save money.