Wooden Floor Grades
Prime Wooden Floor Grade (highest of the wooden floor grades)
Knot content
Only pin knots up to 5 mm diameter allowed, limited to 3 knots per board.
Visual Imperfections
No bark pockets, splits or worm holes allowed.
Sap content
No edge sap allowed, limited core sap up to 5 % of total volume.
Colour
Natural variation allowed, no dark heart wood allowed.
General description
Highest quality timber with only a very rare occurrence pin knots.
Nature floor Grade (highest of the wooden floor grades)
Knot content
Only pin knots up to 5 mm diameter allowed, limited to 3 knots per board.
Visual Imperfections
No bark pockets, splits or worm holes allowed.
Sap content
No edge sap allowed, limited core sap up to 5 % of total volume.
Colour
Natural variation allowed, no dark heart wood allowed.
General description
Highest quality timber with only a very rare occurrence pin knots.
Character Wooden Floor Grade
Knot content
Healthy knots up to 55 mm diameter, Filled cracked knots up to 55 mm diameter, Filled dead knot holes up to 20 mm diameter allowed, joinery repaired knots may be used, Total number of knots unlimited.
Other defects
Limited small bark pockets allowed, End splits up to 1 mm in width and 100 mm in length allowed, limited to 20% of total volume No worm holes allowed.
Sap content
Limited edge sap to 30% of total volume allowed, limited core sap to 15 % of total volume.
Colour
Natural variation, small amounts of dark heart wood.
General description
Clear colour variation and more vivid timber structure.
Rustic Wooden Floor Grade (Lowest of the wooden floor grades)
Knot content
Healthy knots up to 70 mm diameter, Filled cracked knots up to 70 mm diameter, Filled dead knot holes up to 40 mm diameter, joinery repaired – no more than 55 mm allowed, Total number of knots unlimited.
Other defects
Limited small bark pockets allowed, End splits up to 2 mm in width and 200 mm in length allowed, limited to 35 % of total volume No worm holes allowed
Sap content
Edge sap and core sap unlimited
Colour
Natural variation allowed, small amounts of dark heart wood allowed General description Standard rustic grade with a nice selection of natural knots and defects