Beech timber - I. - IV. quality. according STN 491010 a 491012

 

( fresh, un-edged, steamed, un-steamed,)

thickness - 20,25,26,28,32,38,40,50,55,60 mm

width - from 80 mm+

length – from 2,0 m+ , max. 4,0 m

quality:

 

KNOTS

STN	I.	II.	III.	IV.
	2 pcs. up to 20 mm / 1 lm	3 pcs. up to 50 mm / 1 lm	Total dimension  300 mm	Without limitation

 

 

HEART

STN	I.	II.	III.	IV.
	Not allowed	Not allowed	Allowed without limitation	Allowed without limitation

 

 

CORE

STN	I.	II.	III.	IV.
	allowed	allowed	allowed	allowed

 

 

Quality ratio:

I. - 14,6 %

II. - 20,7 %

III.. - 38,6 %

IV.. - 26,1 %