I thought I had a pretty reasonable grasp of wood sizes ... but latest
delivery surprised me.

I wanted a consignment of good old 4x2" sawn ...... so in metric terms
this should come in as standard size of 100 x 47

This is not PSE (or PAR) so expected that size to arrive.

What turned up was 96 x 40 ....


Now most of the span tables are based on TRADA standard sizes ... the
TRADA standard states for thickness's up to & incl 100mm the permitted
deviation is -1mm to +3mm

How do timber yards sell graded sawn wood that is so far off the
standard size ?

If you are using C16 or C24 span tables wonder how much you are under
spec by the wood being so far off the size ?