Six of the nine treating mills treated both rough and surfaced lumber
. Of the remaining three mills, two mills treated surfaced lumber
exclusively, and one mill treated only rough lumber.
As the housing market grew, so to did the sale of surfaced lumber
in long lengths and widths, he said.
Graystain evaluations of dry and surfaced lumber
noted that 45 percent (10 of 22) of the boards from control bolts had obvious (slight to moderate) grayStain on at least one face.