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Tropical hardwood machined lumber products grading rules. Tropical hardwood machined lumber products grading rules. 1 common lumber grade. The northeastern lumber manufacturers association nelma is the rules writing agency for eastern white pine lumber and the grading authority for eastern spruce balsam fir spruce pine fir spf grouping and other commercially important eastern softwood lumber species. Standards jointly adopted by the iwpa lumber products committee the malaysian timber industry board and the malaysian wood moulding council to establish quality levels for premium standard and utility grades.
Visual requirements for this type of lumber are developed by the respective rules writing agencies for. Earl klinea philip a. The grading and measurement of hardwood lumber is not a simple matter and should not be undertaken lightly. Some species must be processed according to special rules.
Hardwood grading associations in united statesa name and address species covered by grading rules products national hardwood lumber association p o. A very simplified condensed overview of the steps for grading a piece of hardwood lumber is as follows. Measurement the nhla grades are determined on an imperial measurement system using inches and feet. Hardwood decking and lumber timber holdings developed and published grading rules and specification language for architects and other specification professionals which have set the standards for over 40 years the highest standard of which has become synonymous with the iron woods brand.
Pdf only or duplicate copies. Determine the surface measurement sm. No rules or regulations can be truly effective unless they are understood and correctly applied. At timber holdings we sell two grades of lumber.
Brooks forest products center blacksburg virginia 24061 usa paraman vt edu c american wood preservers institute. The hardwood grading rules are quite complex and require study. Sm is the width in inches and fractions times the. Evaluation of an automated hardwood lumber grading system d.
Current grading rules are written only in the inch pound system of measurement. The national grading rule establishes the lumber classifica tions and grade names for visually stress graded dimension lumber table 6 2 and also provides for the grading of dimension lumber by a combination of machine and visual methods. Example of hardwood grading for cuttings using no.
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