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Can anyone tell me what the new gradings are for CRS, as I gather the ratings changed a few years ago? I know they range from C16 - C24 but don't know how they relate to some old drawings I have. The timbers are: 100 x 50mm at 350 CRS 175 x 50mm at 350 CRS 100 x 50mm at 500 CRS...

Hi folks We had plans drawn up for a loft conversion in 1997, which were passed by the BCO, but we didn't go ahead with the work due to finances at the time. Some 13 years later(!!) we are now going to have the loft converted. We've submiited the old plans for approval as the structure...