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Woody, Many thanks for your advice and time - I'd better bit the bullet and upgrade the joists! Best wishes Stuart

Woody, Thanks for your reply and shedding some light on this. The big question is whether the existing structure can be justified to Building Control or whether we will have to lump it and insert deeper joists. If I get you right, Building Control might accept calculations based upon load...

Hi, I am new to the forum and would appreciate some input in working out how the floor joists in our 1936 attic are so strong. They are 4"x2" at 350mm centres and span nearly 4m. According to the Building Regs joist span table these joists should only be spaning about 2m yet they feel...