White & Grey Engineered Oak Grading of our Wood flooring
Prime/A.B. Grade Wood Flooring is a mix of A.B grade please see list below
Classic Grade Wood Flooring is mill run grade which is a mix of B.C.D grade with small proportion of A grade.
Country Grade Wood Flooring is a mix of CDE grade
Antique distressed Grade Wood Flooring is a mix of DEF
A—without knots and sapwood, uniform colour, sometimes small knots up to max.2mm allowed.
B—with knots up to max.2-4mm, no sapwood, harmonic-natural colour;
C—with knots up to max.6 cm, sapwood max 15%, natural colour;
D—with knots up to 8cm, and max.30% sapwood, allow a wide range of colour variation.
E — with knots up to 10cm, allow cracks up to 30cm in the middle of the boards (max 5mm wide) and end cracks max 25cm (max 8mm wide), allow a wider range of colour variation
F — with crack less than 15-20mm wide in the middle of the boards, longest crack shorter than 80%of the board length
White & Grey Engineered Oak Underfloor Heating
Engineered wooden floors can be installed and guaranteed over underfloor heating, however manufactures installation instructions must be followed to validate the guarantee.
We source our wood flooring from a number of different manufactures, therefore each board can have its own warranty which may vary between factories. We will be happy to give advice when choosing the right board for your job.
If you are fitting over underfloor heating, it is important that the engineered wood flooring is fixed tightly -so there are no gaps between the board and the underfloor heating.
If the underfloor heating is laid in a screed, then the wood flooring would be glued to the subfloor using an appropriate flooring adhesive.
A liquid damp proof membrane is always recommended over a new concrete subfloor.
If the underfloor heating is laid in between wooden joists, the product we recommend is a multiply 20 mm thick structural board, fitted using a port-o-nailer to the joists. Where the underfloor heating prevents the nail to go into the joist, a face-fix (tung tight) screw can be used to fix as near to the original fixing place as possible. This gives an even fixing of the wood flooring to the joists across the entire room.
Thinner boards can be laid over underfloor heating. We would recommend a multi-ply board as this can be stuck to the floor using a wood flooring glue or can sometimes be floated using a low tog underlay, depending on the manufactures warranty.
Solid wood floors are not guaranteed over underfloor heating.