WOOD - Materials for Civil and Construction Engineers - page 423

T ABLE 10.6 Classification of Engineered Wood Products

Wood stock Class of Product

Structural Panels/Sheets Structural Shapes

(sheathing, flooring) (beams, columns, headers)

Veneer Plywood Laminated veneer lumber

Strands Flakeboard Oriented strand lumber

Waferboard - random orientation Laminated strand lumber

of strands
Oriented Strand Board - strands Parallel strand lumber

oriented, panels made in plys (Parallam)

Composite COM-PLY - Wood fiber core with N/A

veneer exterior

Dried lumber N/A Glued laminated lumber

(Glulam)

Hold-down
bar

Ply

Knife

(a) (b)

FIGURE 10.14 Cutting of plies for plywood and glulam: (a) rotary cutting and (b) slicing
(© Pearson Education, Inc. Used by permission.)

cut from the veneer rolls, are assembled, glued, and pressed. The grains of the
plies are alternated at 90° for plywood and they are arranged parallel for lam-
inated veneer lumber. Plywood is made in sheets, whereas laminated veneer
lumber is made in structural shapes.
Strands have uniform thickness, with a combination of length and
width dimensions up to 150 mm long and 25 mm wide for panel
products, and may be up to 600 mm long for structural shapes. Plies
of strands are made by gluing together the strands to form plies. Structur-
al panels are made by gluing together plies in three or five layers. These

6- 1-

1 2 1 2

24-

1 2