Lumber, Plywood, and Other Wood Products - Carpenter's and Builder's Math, Plans, and Specifications - page 76

Ta b l e 3-3 ( continued )

Abbreviation Meaning
VG Vertical (edge) grain
V1S See EV1S, CV1S, and E&CV1S
V2S See EV2S, CV2S, and E&CV2S
WCH West Coast hemlock
WDR, wdr Wider
WHAD Worm holes a defect
WHND Worm holes no defect
WT Weight
WTH Width
WRD Western redcedar
yp Yellow pine
Courtesy Forest Products Laboratory

Grade B&BTR allows a few small imperfections, mainly in the
form of minor skips in manufacture, small checks or stains caused
by seasoning, and (depending on the species) small pitch areas, pin
knots, or the like. Since appearance grades emphasize the quality of
one face, the reverse side may be lower in quality. In construction,
grade C&BTR is the grade combination most commonly available.
It is used for high-quality interior and exterior trim, paneling, and
cabinetwork, especially where these are to receive a natural finish. It
is the principal grade used for flooring in homes, offices, and public
buildings. In industrial uses, it meets the special requirements for
large-sized, practically clear stock.
The number and size of imperfections permitted increase as the
grades drop from B&BTR to D and E. Appearance grades are not
uniform across species and products, however, and official grade
rules must be used for detailed reference. Grade C is used for many
of the same purposes as B&BTR, often where the best paint finish
is desired. Grade D allows larger and more numerous surface im-
perfections that do not detract from the appearance of the finish
when painted. Grade D is used in finish construction for many of
the same uses as Grade C. It is also adaptable to industrial uses
requiring short-length clear lumber.

Select Lumber
Select lumber is of good appearance and finished or dressed. See
Table 3-4 for grade names, descriptions, and uses.