Nwwpa lumber grading pdf 6x14 1 df s4s s-dryl

The grading rules are published in the western lumber grading. Lumber is assigned a grade stamp before it leaves the sawmill. The provisions of the nlga standard grading rules apply to. Wwpa grades for dimension lumber are established by the american lumber standard committee, inc. Commercial lumber forest products laboratory forest service. Voluntary product standard ps 2099 american lumber standard. Western lumber structural grades wwpa western lumber grading rules product grades section reference usesend uses western lumber dimension grades structural light select structural 42. The majority of us hardwood lumber production is sawn.

Grade stamps applied to 4 and thinner framing lumber surfaced at a moisture content in excess of 19% shall include the designation sgrn. S4s is classified as dressed surfaced lumber in the surfaced width or. Grades described in western lumber grading rules, sections 40. Dimensional lumber western wood products association. For additional information, order wwpa volume 3 species book 12 for color photographs of these grades.

The grade of lumber, as determined by the grader, applies. Western wood products association supported by western lumber manufacturers, wwpa delivers lumber grading, quality control, technical, business information and product support services to sawmills as well as those who use western softwood lumber products throughout the world. Standard thickness for rough sawn lumber is expressed in quarters of an inch. West coast yard grades are identified by letters, names or stress values in the center of the grade stamp. We are pleased to provide free pdf sections of the nlga standard grading rules for canadian lumber 2017 edition for your personal reference. The association is certified to grade and inspect lumber accord. The national lumber grades authority nlga is responsible for writing, interpreting and maintaining canadian lumber grading rules and standards.

Standard specifications for grades of california redwood lumber. Generally, the grade of a piece of lumber is based on the number, character. One internachi inspector reported seeing a set of stamps that was used for falsifying. Extreme fiber stress modulus of species in bending 2 elasticity or group grade single member fb e douglas firselect structural 1500 1,900,000 larch no. Wwpa quality services western wood products association is the leader in the west in lumber grade rules writing, lumber grading and. The minimum rough thickness of dry and green lumber 1 or. Western lumber structural grades wwpa western lumber. The national lumber grades authority nlga is the organization responsible for the establishment, issuance, publication, amendment and interpretation of canadian lumber grading rules and standards.

Grades standardize the quality of lumber at different levels and are based on moisture content, size and manufacture at the time of grading, shipping and unloading by the buyer. Please note that, effective march 1, 2019, supplements to the nlga standard grading rules have been posted on this website under publications updates. Lumber is surfaced to attain smoothness and uniform ity of size. Commercial lumber sizes chart table engineers edge. The purpose of grading rules is to maintain a standard or measure of. The grades are based on a visual or digital scan evaluation of each lumber piece.