I'll shortly be building a new internal mezzanine and considering ammending the original building control approved design - to use traditional green oak post and beam construction.
I have a very reasonably priced supply of green oak beams - my question is how do I get them strength classed for structural purposes?
Standard tables for the typical structural performance of various hardwoods are readily available, and I think it's customary to derate green oak by a third - so beam calculations are straightforward.
But what about actaully getting the beams appoved to a strength class?
Do I need to get someone qualified to visually strength grade timber in to inspect and mark them?
Is it possible to rent/improvise the kit to do defelection tests?
Anyone got experience of getting structural green oak passed by building control?