NBS Specification Suitable for all Wood Flooring Projects

K21 Wood Strip / Board / Board Fine Flooring / Linings.

This template can be used for any or our wood floors and we will be happy to complete one for you and add the relevant information once the wood flooring product has been chosen.

Under Floor Heating: If there is underfloor heating then strict procedures must be adhered to and we always recommend that you have sensors in the screed to prevent overheating and hot spots. The Solid Wood Flooring Company recommends the use of a Fidbox on all wood flooring projects undertaken.

Types of wood flooring

110B wood flooring to:

  • Substrate: Cement and sand screed
  • Preparation: Clean, dry substrate with a moisture content of less than 2%. The cement and sand substrate needs to be firmly secured, Smooth, even, and free from abrupt changes in level. The surface regularity when checked with a 3 m straightedge with 3 mm feet at each end, placed anywhere on the surface, will have no gap greater than 6 mm, and straightedge not obstructed by the substrate.
  • Relative Humidity: The relative humidity above the substrate when tested with a hygrometer to BS 8201:2011, Appendix A must be a maximum of 65% if fitting over underfloor heating and 75% if fitting over an unheated screed.
  • DPM: As designed into the floor
  • Wood boards: Free from decay, through splits and insect attack (including ambrosia beetle damage, unless permitted in the class/ grade specified).
  • Manufacturer: The Solid Wood Flooring Company – Tel: 01666 504015 / mobile: 07831680 206
  • Reference: E130
  • Species: Antique Natural Oak FSC Mix 70%
  • Appearance: Class/ Grade: To BS EN 942, EF grade with sound knots up to 50mm permitted
  • Board size: 220mm wide x 20mm thick x 2200mm long with 4mm solid Oak top layer
  • Edges: Long edges tongued & grooved, Ends tongued & grooved.
  • Bottom of long edges:
  • Finish: Factory finished with 9 coats of Bona Naturale Industrial Mat Lacquer 10 g/m2 of UV Primer, 25 g/m2 UV Light filler, 3 coats of 20 g/m2 of UV Base Coat, 1 coat of 15 g/m2 Natural Base coat, 2 coats of 8 g/m2 Natural Top Coat – Factory applied
  • Method of finishing: Prefinished boards with builders clean
  • Load bearing: Conform to BS 6399-1: 1966 table 1 section 3
  • Reaction to fire: Perform to EN 13501-1 Dn s1
  • Slip Resistance: Tested to BS 7967-2: 2002 (Pendulum Test) and achieve LOW Slip risk in the DRY and MODERATE risk in the WET
  • Thermal Conductivity: EN ISO 10456 and EN ISO 12664 Result 0.15 W/(mk)
  • Storage: Boards to be stored in conditions where no moisture can attack them i.e. Relative Humidity less than 75% and all wet trades to have been completed before boards are received on site. The storage area floor should have a moisture content of less than 2%.
  • Materials: When materials are received on site they should be checked for quality and only accepted if they meet with the clients/specifiers/contractors requirements. Any materials that do not meet with those requirements should be rejected before fitting because once fitted they will have been re-manufactured into a fitted floor.
  • Laying the wood floor:
  • Moisture: The moisture content of the boards at time of laying should be 6-8%. The wood flooring is to be laid in accordance with BS 8201:2011 Code of Practice for Flooring of Timber, Timber Products and wood based panel products.
  • Pattern: As laid.
  • Adhesive: SW 890 – The SW890 Wood Floor Adhesive is elastic; according to EN 14293
  • (soft); 1-component Silane based adhesive for parquet.
  • Underlay: None
  • Expansion: A 10mm expansion gap is required around the perimeter of the floor and/or where the wood flooring meets differing materials. 8mm expansion gaps should be designed into the floor at a minimum of 6 – 8 Lm in any one direction and construction joints should not be bridged.


  • Aesthetics: It is the art of the fitter to ensure that fitting is conducted to achieve an acceptable blend of shade variation, colour and knotting which are all inherent characteristics of any natural wood product
  • Specifier: The specifier should ensure that the wood floor specified is suitable for use.
  • Manufacturer: The manufacturer will take responsibility for the performance of the boards provided that they were received on site in good condition, stored in the correct manner and have been fitted in accordance with BS8201:2011
  • Contractor: The contractor will be responsible for the ensuring that the wood boards are not received on site until all conditions are correct within the guidelines of BS8201:2011.
  • The contractor will be responsible for making sure the boards are kept safe on site.
  • The contractor is responsible for the correct laying of the boards.
  • The contractor is responsible for ensuring that the finished floor is correctly protected in between the completion of the fitting and the handover to the client.
  • Fitter: The wood flooring fitter will be responsible for ensuring that the site conditions comply with BS8201:2011.
  • The wood flooring fitter is responsible for using the wood boards to create a finished floor that complies fully with the architects/contractors instructions in accordance with BS8201:2011.

The wood flooring fitter must ensure that the contractor understands what the finished floor will look like before starting fitting.
The wood flooring fitter is responsible for checking that every board is of the desired quality and suitable for use before, during and after fitting and if there is any doubt, boards should not be fitted.


  • NEVER clean wood flooring with water
  • ALWAYS use the cleaning products recommended by the manufacturer The Solid Wood Flooring Company
  • Fitters/Builders clean On completion of fitting the surface of the boards should be vacuumed to remove any particles of wood or sawdust.
  • The fitter should ensure that no residues from any of the fitting remains attached to the surface of the boards.
  • The fitter should clean the boards with the recommended cleaner and ensure that the contractor and client (if appropriate) understand how the wood flooring should be cleaned and maintained.
  • The contractor should request an Operations and Maintenance manual from The Solid Wood Flooring Company to give to the client to ensure that they know how to clean and maintain the wood floor.

Covering the floor NEVER cover the floor with any impervious materials which could cause the boards to sweat and affect the structure of the boards. This includes dense rugs, rubber backed mats and bean bags which can produce hot spots on the floor.

590 Protection

  • Protective covering: Submit proposals – Remove at completion
  • NEVER cover the finished wood floor with any impervious material and if a protective covering is placed over the finished floor.

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