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Sooo - I'm having great difficulty in sourcing the 75mmx150mm c24 joists in 5m+ lengths. I plan to do the sideways span which is 4.8m plus some overhang. I will then do the firrings perpendicular. Instead of using 75mmx150mm can I bolt together 2 47mmx150mm with say 4 bolts to double them up...

Thanks cdbe. I was saving the 18mm to 11mm osb board change to compensate for my lack of skill in keeping to a 10mm bed between courses! In terms of the firrings, cutting the joists was my original plan until I realised that using a 220mm joist and doing an 85mm drop would take it to only 135mm...

Thanks for your input. Part of the reason I looked at 50x150 was that I was able to find lengths of 5.4m+ but was having difficulty finding longer lengths for the 75mm width from my usual suppliers. Had another search after your comments and found a supplier that will do longer lengths for...

Hi all, I've read many posts on the subject but thought it was time to post my own query. The ultimate question - will a 50x150 roof joist be sufficient? Background - I'm building a single leaf (100mm) concrete block garden building with a flat roof design, keeping below the 2.5m rule for...