WWPA Lumber Species and Grades
- 1. 4 GRADE CATEGORIES Western solid-sawn lumber is grouped into three broad categories: framing (or structural) lumber, which is graded for strength; appearance lumber, which is not graded for strength; and industrial (or factory) lumber, which is generally graded for specific end uses or for remanufacturing and recovery purposes. Framing lumber includes the grades intended for structural applications in both conventional and pre-engineered framing systems. Western species structural lumber is manufactured primarily from second- and third-growth softwoods and graded, either visually or mechanically, on the basis of its strength; each species and grade has an assigned design value. General classifications include: Dimension lumber grades Special Dimension lumber grades Timber grades Design values for Dimension lumber are published as BASE VALUES which must be adjusted for size as well as conditions of use. Refer to pages 5 to 17. Appearance lumber includes a variety of non-structural grades intended for applications where strength is not the primary considera- tion. Appearance grade Western lumber is manufactured primarily from older (not old growth) and second-growth softwood trees. Many of the products in this category are often run-to-pattern for paneling and siding applications. General classifications include: High-quality Appearance grades (Selects, Finish and Special Western Red Cedar Grades) General purpose Board grades (Commons under WWPA Rules and Alternate Board Grades under WCLIB Rules) Radius-edged Patio Decking grades (Patio 1 and Patio 2) Refer to pages 18 to 20. Industrial lumber includes both structural and non-structural grades intended for specific applications. General classifications include: Structural grades (Mining Timbers, Scaffold Plank, Foundation lumber, Stress-Rated Boards) Factory and Shop grades (non-structural grades intended for cut up and remanufacturing) Non-structural grades (Gutter, Picket, Lath, Batten, Stepping) Refer to pages 21 and 22. Western Lumber Species & Grades WESTERN LUMBER SPECIES MARKETING CATEGORIES Standard Species Western Softwood Species Alternate Species Combinations Combinations Western Woods Douglas Fir-Larch Douglas Fir-South Hem-Fir Spruce-Pine-Fir (South) Western Cedars Douglas Fir Pseudotsuga menziesii Western Larch Larix occidentalis Douglas Fir-South Pseudotsuga menziesii (Grown in AZ, CO, NV, NM and UT) Western Hemlock Tsuga heterophylla Noble Fir Abies procera California Red FirAbies magnifica Grand FirAbies grandis Paci鍖c Silver FirAbies amabilis White Fir Abies concolor Sitka Spruce Picea sitchensis Engelmann SprucePicea engelmannii Lodgepole Pine Pinus contorta Alpine Fir Abies lasiocarpa (or Subalpine Fir) Ponderosa Pine Pinus ponderosa Sugar Pine Pinus lambertiana Idaho White Pine Pinus monticola (or Western White Pine) Mountain Hemlock Tsuga mertensiana Incense Cedar Libocedrus decurrens Western Red Cedar Thuja plicata Port Orford Cedar Chamaecyparis lawsoniana Alaskan Cedar Chamaecyparisnootkatensis White Woods (any combination of the Western true firs, spruces, hemlocks or pines) Engelmann Spruce- Engelmann Spruce- Lodgepole Pine Alpine Fir Alpine Fir- Engelmann Spruce- Hem-Fir Lodgepole Pine- Alpine Fir Ponderosa Ponderosa Pine- Pine- Lodgepole Pine Sugar Pine