lumber supply

Wood Dr

Narrow lumber from supplier and lower yield

Q. I was shown two pieces of lumber, one 6-1/2 inches wide and 12 feet long and another almost an inch wider (not quite 7-1/2 inches wide) and 12 feet long and the grader said both were counted as 6 BF. The grader commented to me that some mills produced a lot of this narrow lumber. If our grader is correct, 6-1/2 inches x 12 feet is 936 square inches, while 7-1/2 inches x 12 feet is 1080 inches which is 15 percent more wood. Or I figure that 6-1/2-inch pieces are 15 percent less. I also know that our percentage yield with 6-1/2 inches is a bit lower than from 7-1/2-inch pieces, but this a bit scary. Is this right? What is going on?