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Home > Quality Standards > Engineered Wood Flooring
  
  
  
Oak/Ash | Maple/Birch/Beech | Kempas/Merbau/Jatoba | Walnut/Cherry | Bamboo
  
[G] look up term in glossary.

  Walnut/Cherry

Location

Defects

Grade N

Grade R

Face Veneer

Live knot [G]

Not restricted

Not restricted

Dead knot [G]

3 allowed diameter ≤ 5 mm max 20% of pieces

3 allowed, diameter ≤10 mm

Brown line[G]

2 allowed, sparse
length ≤ 15 mm; width ≤ 3 mm

4 allowed,
length ≤ 30 mm; width ≤ 5 mm

Veins

Not restricted

Not restricted

Colour

Natural colour

Natural colour

Discolouration [G]

Not allowed

Slight and natural

Colour Variation [G]

Slight and natural

Not restricted

Sapwood [G]

Not allowed

Not restricted

False Heart Wood [G]

Not allowed

Not restricted

Crack [G]

Not allowed

Not allowed

Wormholes [G]

Not allowed

Not allowed

Stain [G]

Not allowed

Slight

Black spot

Not allowed

3 allowed,
diameter ≤ 20 mm

Middle Layer

Middle layer gap

3 mm

3 mm

Rot [G]

Slight, no fall off

Slight, no fall off

Tongue missing

≤ 20 mm (cumulative)
≤ 1% of plank's length

≤ 30 mm (cumulative)
≤ 3% of plank's length

Destruction of ends

Slight

≤ 2 mm each end

Back Veneer

Bore hole

Diameter ≤ 30 mm

Diameter ≤ 30 mm

Dead knot [G]

No fall off

Allowed

Wormholes [G]

Slight

Mild

Inbark [G]

Slight

Allowed

Cymbate and round mending

≤ 10% of plank's area

Allowed

Dry crack

Slight

Length ≤ 1000 mm;
width ≤ 10 mm

Lack of sanding

Slight

Allowed

Varnish

Putty mending mark

Not allowed

Slight

Varnish stains

Not allowed

Slight

Light not even

Not allowed

Slight

Varnish protruding over the edge

Not allowed

Slight

Scratches /Exposed Undercoat [G]

Not allowed

Slight

Varnish not even

Not allowed

Slight

Others

Tongue deflection

Not allowed

Not allowed

Roughness of the tongue and groove

Not allowed

Slight

Wanting arris

Not allowed

Slight

Joining of tongue and groove

Good fit

Good fit

Cup warping concave [G]

Chord ≤ 0.15% of plank's width

Cup warping convex [G]

Chord ≤ 0.20% of plank's width

Bow warping concave [G]

Irrespective of grading:

  1. Tongue and Groove with top veneer ≤ 1 mm: Chord ≤0.5% of plank's length
  2. Tongue and Groove with top veneer > 1 mm: Chord ≤0.2% of plank's length
  3. Glue-less system with top veneer > 1 mm: Chord ≤0.2% of plank's length

Bow warping convex [G]

Irrespective of grading:

  1. Tongue and Groove with top veneer ≤ 1 mm: Chord ≤1.0% of plank's length
  2. Tongue and Groove with top veneer > 1 mm: Chord ≤0.8% of plank's length
  3. Glue-less system with top veneer > 1 mm: Chord ≤0.4% of plank's length

Height difference

0.15 mm

0.2 mm

Roughness of ends

Not allowed

Slight

Tolerance on dimensions

Length (+/-) 1 mm,Width (+/-) 0.1 mm,Thickness (+/-) 0.15 mm,Gap 0.2 mm




  
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