| Oak/Ash |
| Defects |
Top Face |
Back Face |
| Grade A |
Grade B |
Grade C |
| Live knot [G] |
2 allowed, diameter ≤ 5 mm;plank length ≤ 500 mm |
2 allowed, every 500 mm of plank's length;5 mm ≤ diameter ≤ 20 mm
|
Not restricted as long as diameter ≤ 20 mm
|
Not restricted in size or number
|
| Dead knot [G] |
Not allowed |
1 allowed, every 500 mm of plank's length; diameter ≤ 4 mm |
5 allowed, diameter ≤ 10 mm |
Not restricted as long as diameter ≤ 20 mm |
| Wormholes [G] |
Not allowed |
Not allowed |
5 allowed, diameter ≤ 2 mm (mending) |
Not restricted as long as diameter ≤ 15 mm |
| Brown line [G] |
Not allowed |
Not restricted |
Not restricted |
Not restricted |
| Sapwood [G] |
Not allowed |
<10% of plank's area |
Not restricted |
Not restricted |
| Rot [G] |
Not allowed |
Not allowed |
Not allowed |
Area of initial rot ≤ 20% |
| Wane [G] |
Not allowed |
Not allowed |
Not allowed |
Length ≤ 30% of plank's length; Width ≤ 20% of plank's width |
| Crack [G] |
Not allowed |
Not allowed |
2 allowed, width ≤ 0.1 mm; length ≤ 15 mm
|
Not restricted in number; width ≤ 0.5 mm; length ≤ 50 mm |
| Cut and chatter mark [G] |
Not allowed |
Not allowed |
Not distinct |
Not restricted |
| Indentation |
Not allowed |
Slight |
Slight |
Not restricted |
| Scratches on varnish |
Not allowed |
Slight |
Slight |
Not restricted |
| Blister [G] |
Not allowed |
Not allowed |
Not allowed |
Not restricted |
| Exposed undercoat [G] |
Not allowed |
Not allowed |
Not allowed |
Not restricted |
| Pin holes |
Not allowed |
3 allowed, diameter ≤ 0.5 mm |
3 allowed, diameter ≤ 0.5 mm |
Not restricted |
| Wrinkling [G] |
Not allowed |
Not allowed |
< 5% of plank's area |
Not restricted |
| Nib [G] |
2 allowed, length ≤ 500 mm;5 allowed, length > 500 mm |
4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm |
4 allowed, length ≤ 500 mm;8 allowed, length > 500 mm |
Not restricted |
