Code of Conduct


Members’ Directory and Buyers’ Guide 2014


region, generally as it is cut from the log. As the timber dries to its end-use dimensions, it will shrink and this loss of volume may be up to 7%. It is trade practice to sell sawn timber through the UK supply chain and down to the end user based on nett (dry) dimensions after kilning or drying has taken place. The surface roughness of sawn timber and the possibility of dimensional change depending upon relative humidity, means that it is not generally practical to use fractions of millimetres when measuring or converting sawn timber. This fact is recognized in the dimensions and tolerances defined in the above Standards.


Metric Units


Where the Grading Rules use metric units, sawn goods will normally be supplied in the following UK standard metric dimensions:


12 38


115 225


16 44


125 250


19 50


150 275


Thickness and Widths in mm 1.20 3.00 4.80 6.60


1.50 3.30 5.10 6.90


Lengths in Metres


Other special and European Standard metric sizes would be specifically defined on the purchase contract and then sold on through the supply chain as these defined sizes.


Imperial Units


Where the original Grading Rules used imperial units, a conversion process will take place to achieve metric units for the sales transaction.


28


1.80 3.60 5.40 7.20


22 63


160 300


25 75


175 etc


32


100 200


If the transaction involves full packs of timber as supplied from the country of origin, the quantity in cubic feet as provided by the original supplier will be converted directly to cubic metres, using the factor 35.315 ft3 = 1 m3. The original supplier may, on occasion, use an alternative imperial unit such as Board Measure. In such cases UK timber companies first convert the imperial unit to cubic feet before proceeding with the conversion to cubic metres.


If the transaction involves timber removed from its original packing, then there are two systems which may be used to achieve a metric quantity for sale:


System A, where the nominal Thickness, Width and Length of each piece are measured in imperial sizes and calculated to an imperial volume, which is then converted directly to cubic metres using the factor 35.315 ft3 = 1 m3.


NB: Where goods were produced according to NHLA Grading, the rules do not require boards to be cut to specific imperial widths, but state when measurement takes place any board up to ½” oversize will be rounded down to the nearest inch, while any board between ½” and the next full inch will be rounded up to that dimension. It is trade practice to sell NHLA graded timber through the UK supply chain on this measurement basis.


2.10 3.90 5.70 etc


2.40 4.20 6.00


2.70 4.50 6.30


System B, where the actual Thickness, Width and Length of each piece are measured in metric sizes and the cubic metre volume calculated as the basis for the sales transaction.


Processing Before Sale Including Re-Sawing, Machining To PAR Or Mouldings


Where processing on imported timber is undertaken, then the sawing and machining will be carried out to specified finished sizes and dimensions, normally in metric. The equipment used for these tasks is, therefore, specifically calibrated to metric dimensions. Occasionally, stock may be sawn or machined to imperial units generally because they are required by the customer to match existing timber sections. It is trade practice to sell machined items based upon the nearest standard metric size as given in the list above. Amended June 2011, Amended 2003, 24 April 2001


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