Panel Surface Quality

Wood as a natural material is highly varied in its structure and has many natural characteristics.  Often such characteristics can impair its visual appearance.  Common visual characteristics are knots, annual rings and fissures.  The surface appearance of KLH cross-laminated timber panels is dependent on the surface type specified:

  • Domestic Visual Quality (DVQ) - the surface lamellae are planed and sanded.  At a moisture content of 12% +/- 2% a maximum gap width of 2mm between the lamellae is permitted. The edges of all DVQ panels are chamfered as standard.
  • Industrial Visual Quality (IVQ) - the surface lamellae are planed and lightly sanded. At a moisture content of 12% +/- 2% a maximum gap width of 4mm between the lamellae is permitted.
  • Non-Visual Quality (NVQ) - there is no appearance class in accordance with BS EN 13017-1:2011.  Boards are C24 (10% C16 permissible) in accordance with BS EN 14081-1:2005.  NVQ panels will not be provided for visual surfaces unless specifically requested by the client, on the understanding that KLH UK will not accept liability for the visual appearance of NVQ panels. Unprepared NVQ surfaces are not suitable for the application of painted visual grade finishes.

The perception of the surface finishes above is subjective and may lead to widely differing interpretations on what constitutes an acceptable finish.  Endgrain can only be provided as a non-visual grade finish. Sample panels representing the above surface finishes are available on request from our London office.

For further information please refer to the 'Cross-laminated Timber' document, which can be downloaded below.