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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.

3-strip | 2-strip | 1-strip

Oak/Ash 3-strip Standard

Location

Defects

Grade A

Grade B

Grade C

Face Veneer

Live knot [G]

Diameter ≤ 2 mm;
sparse

Diameter ≤ 10 mm;
sparse

Diameter ≤ 15 mm;
sparse

Dead knot [G]

Not allowed

3 allowed, diameter ≤ 4 mm

3 allowed, diameter ≤ 10 mm

Sapwood [G]

Not allowed

Not distinct,
natural and harmonic
(mending)

≤ 25% of plank's area;
≤ 4-6 pieces (mending)

Colour Variation [G]

Natural and harmonic

Slight

Low contrast

Rot [G]

Not allowed

Slight

Slight

Inbark [G]

Not allowed

2 allowed, length ≤10 mm, width
≤3 mm

Light and natural,
2 allowed, diameter ≤ 20 mm

Pith [G]

Not allowed

Not allowed

Not allowed

Retrorse veins

Not allowed

Slight

Allowed

Crack [G]

Not allowed

Not allowed

Slight,
1 allowed, diameter ≤ 5x2 mm (mending)

Veins

FQ mixed

FQ mixed

FQ mixed

Black/Blue spot

Not allowed

Not allowed

Slight

Brown line [G]

Not allowed

Not allowed

Allowed

Dimension shortness

Not allowed

Not allowed

Not allowed

Glue stains

Not allowed

Not allowed

Slight

Wormholes [G]

Not allowed

Not allowed

2 allowed,
diameter ≤ 2 mm (mending)

Indentation

Not allowed

Not allowed

Slight

Strong wooden lump

Not allowed

Slight

Slight

Discolouration [G]

Not allowed

Not allowed

Slight, natural

Resin pocket [G]

Not allowed

Not allowed

Length < 1 mm

Wane [G]

Not allowed

Not allowed

Slight

Wood abnormality

Not allowed

Not allowed

Slight

Face veneer gap Transverse

0.1 mm

0.2 mm

0.2 mm

Lengthwise

0.1 mm,
length > 10 mm

0.2 mm,
length > 200 mm

0.2 mm,
length > 300 mm

Middle Layer

Middle layer gap

3 mm

3 mm

3 mm

Rot

Slight, no fall off

Slight, no fall off

Slight, no fall off

Tongue missing

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

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

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

Destruction of ends

Not allowed

Slight

≤ 2 mm each end

Back Veneer

Bore hole

Diameter ≤ 30 mm

Diameter ≤ 30 mm

Diameter ≤ 30 mm

Dead knot

No fall off

No fall off

Allowed

Wormholes

Few

Slight

Mild

Inbark [G]

Slight

Slight

Allowed

Cymbate and round mending

≤ 5% of plank's area

≤ 10% of plank's area

Allowed

Dry crack

Slight

Slight

Length ≤ 1000 mm;
width ≤ 10 mm

Lack of sanding

Slight

Slight

Allowed

Varnish

Putty mending mark

Not allowed

Not allowed

Slight

Varnish stains

Not allowed

Not allowed

Slight

Light not even

Not allowed

Not allowed

Slight

Varnish protruding over the edge

Not allowed

Not allowed

Slight

Scratches /Exposed undercoat

Not allowed

Not allowed

Slight

Varnish not even

Not allowed

Not allowed

Slight

Others

Tongue deflection

Not allowed

Not allowed

Not allowed

Roughness of the tongue and groove

Not allowed

Not allowed

Slight

Wanting arris

Not allowed

Not allowed

Slight

Joining of tongue and groove

Good fit

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

0.1 mm

0.15 mm

0.2 mm

Roughness of ends

Not allowed

Not allowed

Slight

Tolerance on Dimensions

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


Oak/Ash 2-strip Standard

Location

Defects

Grade N

Grade R

Face Veneer

Live knot [G]

3 allowed, diameter ≤ 10 mm

Not restricted

Dead knot [G]

2 allowed,
diameter ≤ 5 mm, sparse

3 allowed,
diameter ≤ 10 mm, sparse

Sapwood [G]

≤ 5% of plank's width (mending)

≤ 30% of plank's width (mending)

Colour variation [G]

Slight and natural

Natural and harmonic, low contrast

Rot [G]

Not allowed

Not allowed

Inbark [G]

Not allowed

2 allowed,
length ≤ 15 mm;
width ≤ 4 mm (mending)

Pith [G]

Not allowed

Not allowed

Crack [G]

Not allowed

Not allowed

Brown line [G]

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

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

Stains

Not allowed

Not allowed

Wormholes [G]

Not allowed

5 allowed, sparse
diameter ≤ 2 mm (mending)

Plinth mark

Not allowed

Not allowed

Discolouration [G]

Not allowed

Slight and natural

Wane [G]

Not allowed

Not allowed

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

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


Oak/Ash 1-strip Standard

Location

Defects

Grade N

Grade R

Face Veneer

Live knot [G]

3 allowed,
diameter ≤ 10 mm

Not restricted

Dead knot [G]

2 allowed,
diameter ≤ 5 mm, sparse

3 allowed,
diameter ≤ 25 mm, sparse

Sapwood [G]

≤ 5% of plank's width (mending)

≤ 30% of plank's width (mending)

Colour variation [G]

Slight and natural

Natural and harmonic, low contrast

Rot [G] [G]

Not allowed

Not allowed

Inbark [G]

Not allowed

2 allowed,
length ≤ 15 mm;
width ≤ 4 mm (mending)

Pith [G]

Not allowed

Not allowed

Crack [G]

Not allowed

2 allowed at most,
length < 50 mm;
width < 2 mm
(mending with putty)

Brown line [G]

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

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

Stains

Not allowed

Not allowed

Wormholes [G]

Not allowed

5 allowed, sparse
diameter ≤ 2 mm (mending)

Plinth mark

Not allowed

Not allowed

Discolouration [G]

Not allowed

Slight and natural

Wane [G]

Not allowed

Not allowed

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

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

  

FQ stands for Flat Sawn and Quarter Sawn

Nature (N) is a mixture of A and B grade
Rustic (R) is a mixture of C and D grade
D grade is any grade lower than C grade

  
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