Summarized from EU norm EN 975-1Thickness 27 mmWidth 160 mm till 280 mm | ||
Graded on two faces , sapwood free | ||
QF 1A/1b
| 1st & Bis 3 or 4 sides clear with allowance small knots ca 12 mm | |
QF 1b/2
| Bis / 2 Healthy knots from 12 mm till 25 mm | |
QF 2/3
| 2 / 3 Heathy knots from 25 to 45 mm | |
QF 3 /4 | 3 /4 Knots from 45 to 80 mm. No open heart, no end cracks. | |
Graded on best face | |
QF 1-2 X | Elegant “Top grade, for solid flooring producers or toplayers producers” Flat boards, no heart. |
QF 2/3 X | Character “Selected boards for solid flooring or toplayers producer” Knots between 25 to 45 mm. |
QF 3/4 X
| Rustic “Cost effective boards” Knots size from 45 till 80 mm. |
KERN | Heart “Special for reclaim or aged flooring” Boards with full heart in the middle. |
QF5
| Barn “If you love bigger knots” Unlimited knots size. Limited sapwood. |