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i have a problem i don't know what it is, damp of some kind along the outer wall of my bedroom appearing is like black spots the landlord said it is condensation cos the flat has been empty for 3 months i have treated it with mould killer but every couple of weeks it comes back and i wipe it of...

hi guys can anybody tell me how to work out the above so as to determine the steel and timber required for a loft floor, the loft is open and only has one support attatched to the rafters,the loft is 27ft long and 16ft wide the only other thing up there part from rubbish is a chimney stack, i...