question on timber grading marks

[climber101]

Hi,

purchased some c24 timber tanalith E treated. within the markings on the timber it says "dry graded R" and "WPPA C24 M PEFC"

I understand the WPPA means European whitewood any idea what the R means and also what the M means?

Best Regards

 

[hotrod]

No idea. The important bit is you know it's been pressure treated and it's C24. Maybe it's to do with the chain of custody? Phone up the suppliers if you really want to know?

 

[stuart45]

M=Machine graded

 

[hotrod]

Ahhh. I thought it was all done manually by "sight" and that's why the certificated yards had to have certified/approved "sorters".

 

[jeds]

R is regularised.