1. THERMORY PINE GRADING
2013

2. Thermory Pine – Visual Grading Rules for Natur
Wood qualities / Defects
Sound Knot
Splay knot
Edge knot and Arris knot
Knot cluster
Pin knot
Black and Dead knot
Broken knot
Loose knot and Hole
Rotten knot
Bark ringed knot
Resin pocket
Heart wood and Heart
Rot
Log blue stain and Mould
Insect holes
Wane
Top rupture
Bark pocket and Scar
Shake
Cup and Twist
Spring and Bow
Hit & Miss
Grading process
Visual Grading Rules
General characteristics
Thermory Pine

3. Grading Process Grading is done over 3 stages:
When kiln dried raw material arrives to factory
After the boards are split, through cut etc just before the thermo treatment phase
Final grading is after thermo-treatment and after profiling (planning). This is when the “face” of the board is choosen.
Thermory Pine

4. Visual Grading Rules for Thermory Pine
FACE
Graded face - Smooth, without visible mechanical damage from tools. No Hit & Miss allowed
Ungraded face - Cutting marks max 2mm width allowed
 KNOTS
Bark ringed knot - Allowed 5 knots within 2 metres. Maxium knot size is 20% of piece’s width
Black & Dead fixed knots - Allowed, at face area maximum size 20% of piece’s width, at edges maximum size 50% of piece’s thickness
Broken knot - Allowed when breakage is invisible after installation. Small cracks inside healthy knots are allowed
Edge and Arris knot - Allowed in all sizes, when solid
Knot cluster - Allowed, when knots’ within cluster are solid
Loose knot and hole - Not allowed, if loose knot or hole is visible in usage
Pin knots - Sound < 10mm are allowed
Rotten knot - Not allowed
Sound knot size - Solid sound knots allowed max. ½ of the width
Splay knot - Sound knot rules apply to sound splay knots
Impregnated Pine

5. Visual Grading Rules continued
OTHER CHARACTERISTICS
Bark pocket and Scar - 1 bark pocket and scar (L 120mm x W 20mm) within 2 metres. Must be solid on top.
Heart wood and Heart - Allowed, heart is a natural quality for sawn heart wood pine
Insect holes - Not allowed
Mould - Not allowed
Resin pocket - 3 resin pockets (W 10mm x L 50mm) allowed within 2 metres
Rot / decay - Not allowed
Shake / Surface crack - Shallow and short allowed. Through and ring shake not allowed. Continuous cracks not allowed. Maximum area of breakage is 50sqmm.
Top rupture - Allowed, maximum 50% out of piece’s width
Wane - Not allowed
Cup - Allowed 2% of piece’s width within 2 metres
Twist - Allowed 10% of piece’s width within 2 metres. Permitted as long as the board can easily be mounted
Spring - Allowed 4 mm within 2 metres
Bow - Allowed 15 mm within 2 metres
 A maximum of 3% of pieces within a pack can be of a lower quality than Natur.
THE FOLLOWING PHOTOS ARE NOT ALL OF THERMORY PINE.
Impregnated Pine

6. General knot types Sound knot Dead knot Barkringed knot Black knot
Source: RT-kortti
Sound knot
Dead knot
Barkringed knot
Black knot
Arris knot
Splay knot
Spike knot
Knot cluster
Thermory Pine

7. Sound knot
Allowed to maximum of half
the board width
Thermory Pine

8. Splay knot Sound knot rules apply also to sound splay knots
Thermory Pine

9. Edge and Arris knot Allowed in all sizes, when solid Edge knot
Thermory Pine

10. Knot cluster & Scattered knots
Allowed, when
knot’s within
cluster are solid
Knot cluster
Scattered knots
Thermory Pine

11. Pin knot
Pin knots =
sound knots
<10 mm are
allowed
Thermory Pine

12. Black and Dead knot
Allowed, at face area maximum size 20 % of piece’s width, at edges maximum size 50 % of piece’s thickness.
Black knot
Dead knot
Thermory Pine

13. Broken knot
Allowed when breakage is invisible after installation. Small cracks inside healthy knots are allowed.
Hole
Thermory Pine

14. Loose knot and Hole
Not allowed, if loose knot or hole is not invisible in usage!
Impregnated Pine

15. Rotten knot
Not allowed!
Thermory Pine

16. Bark ringed knot Allowed 5 knots within 2 metres.
Maximum knot size is 20 % of piece’s width.
Thermory Pine

17. Resin pocket
3 resin pockets (width 10 mm x lenght 100 mm) allowed within 2 meters.
Thermory Pine

18. Heart wood and Heart Allowed, heart is a natural quality for
sawn heart wood pine
Thermory Pine

19. Rot
Not allowed!
Thermory Pine

20. Log blue stain and Mould
Not allowed!
Log blue stain
Mould
Mould
Mould
Thermory Pine

21. Insect holes
Not allowed!
Thermory Pine

22. Wane
Not allowed!
Thermory Pine

23. Top rupture
Allowed, maximum 50 %
out of piece’s width
Thermory Pine

24. Bark pocket and Scar 1 bark pocket and scar (L 120 mm x
W 20 mm) within 2 meters. Must be solid on top.
Scar
Bark pocket
Thermory Pine

25. Shake and Surface cracks
Shallow and short allowed. Continuous cracks not allowed. Maximum area
of breakage is 50sqmm. Through
& ring shake not allowed!
Impregnated Pine

26. Cup and Twist Cup: Allowed 2 % of piece’s width within 2 meters.
Twist: Allowed 10 % of piece’s width within 2 meters, as long as board
can be easily mounted.
Twist
Cup
Thermory Pine

27. Spring and Bow Spring: Allowed 4 mm within 2 meters.
Bow: Allowed 15 mm within 2 meters.
Spring
Bow
Thermory Pine

28. Hit & Miss
Not allowed!
Thermory Pine