Large waste areas. Does not take paint well. Used for sheathing, subflooring, concrete form work. Applications are similar to No. 5. Boards in this category will be of most use to the woodworker interested in making quality softwood furniture with a natural finish.
Examples are trim, siding, shingles, flooring, casing, base, stepping, and paneling.
To further complicate matters, some differences in grade designations exist for different wood species and products. Cedar and redwood, for example, have different grade designations than other softwoods due to the marked difference in color between heartwood and sapwood in these two woods. Typical redwood board grades are Clear All Heart, Clear, and Select. In spite of all of these complexities, many woodworkers will encounter four grades of Select boards in shopping for project lumber. These are denoted A, B, C, and D with A being the highest grade, and D the lowest.