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Any update on this?

So what options would you recommend? As I do want to continue with 5x2.

@Dereekoo how does adding 4 rows of nogging and adding one double joist in the middle of the roof affect the sag figures? Is this something you know how to work out? Thanks in advance

What do you mean when you say this layman terms.

@Dereekoo So from your reply, using the 5x2 joist is within tolerance without adding any extra joists and having a single row is nogging is within tolerance. I just don't want a situation further down the road where over time sagging could occur, particularly if I can add extra support measures...

Ah I see looks like 18mm is the way forward with the OSB3.

@Dereekoo Sorry you gone into abit technically detail, but is the deflection amount good or bad as I don't get that bit. But if the deflection is not good due to the size, I was to buy C24 5x2 and if these were slightly under spec as the span is wider, then looking at doubling up the centre...

Morning All, I am trying to work out joist calculation for a flat roof that I want to build for my garden office. The joists will have 50mm to 0mm furrings, and osb3 18mm and 1.2mm epdm rubber. The roof span is approximately 3.12 meters (depth) by 5.4 meters (width). It's a double block...