Floor Grading

Prime Oak

Healthy pin knots up to 5mm diameter. Maximum 3 per board
No bark pockets, splits or worm holes allowed
Sap content – No edge sap allowed, limited core sap to 5% of total volume
Colour – Natural variation allowed, no dark heart wood allowed

Nature / Rustic A Oak

Healthy knots and filled cracked knots up to 20mm diameter allowed,
Filled dead knot holes up to 10mm diameter allowed with a total of knots limited to 3 per board
No bark pockets, splits or worm holes allowed
No edge sap allowed with core sap limited to 5% of total volume
Natural colour variation allowed, no dark heart wood allowed

Rustic A/B (Character) Oak

Healthy Knots allowed up to 55mm diameter allowed
Filled cracked knots up to 55mm diameter and filled dead knot holes up to 20mm diameter allowed
(Replacement knots may be used on larger dead knot holes)
Total number of knots unlimited with limited small bark pockets allowed
End splits up to 1mm in width and 100mm in length allowed, limited to 20% of total volume. No worm hole allowed
Edge sap allowed limited to 30% of the width of the board with core sap limited to 15% of total volume
Natural colour variation allowed, small amounts of dark heart wood allowed