B. Lumber (sawed material; used treated or untreated as the situa

tion demands):

1. Common boards (generally 1 inch or less in thickness):

(a) Roof and wall sheathing.

(b) Subflooring.

(c) Concrete forms.

(d) Chutes for material delivery, etc.

(e) Fences.

(f) Shoring.

2. Finish boards (generally 1 inch or less in thickness):

(a) Walls.

(b) Partitions.

(c) Interior and exterior trim.

(d) Vertical siding.

3. Dimension lumber (2 to 5 inches thick and 2 inches or more wide-not strength graded):

(a) Joists, rafters, studs, plates, headers.

(b) Sheet piling.

(c) Roof decking.

(d) Rough flooring.

(e) Retaining walls.

(f) Temporary structures.

(g) Concrete forms.

(h) Laminated walls and partitions.
(i) Crossarms.

FIGURE 2.-Potomac River Yacht Basin in Washington, D.C., showing extensive use of preservative treated piling and wood members for wharves and catwalks.

FIGURE 3.-Lumber, the primary product of the forest, is the basic material for homes and other light construction.

4. Structural lumber (at least 2 inches thick and 4 inches wide graded for strength):

(a) Joists, rafters, studs, headers.

(b) Roof decking.

(c) Subflooring.

(d) Bridges and trestles (bracing, decks).

(e) Retaining walls and dams.

(f) Culverts and drains.

Shoring.

Truss members.

Concrete forms.

(n) Tanks.

(0) Fallout shelters.

C. Timbers (sawn material over 5 inches in least dimension; used untreated or treated with preservatives or fire-retardant treatments):

1. Common timbers (not graded for strength):

(a) Retaining walls and dams.

(b) Bridges and tressels:

(1) Wheel guards.

(2) Sills, caps.

(3) Decking.

(c) Heavy mill-type constructions.
(d) Guard posts and planking.

(d) Heavy mill-type constructions.

(e) Crossarms.

(f) Towers and derricks.

(g) Piers and wharves.

(h) Stadiums, grandstands, bleachers.
(i) Truss members.

D. Millwork and miscellaneous:

1. Wall paneling.

2. Windows and doors.

3. Flooring.

4. Siding.

5. Ladders.

6. Trim and moldings.

7. Cabinets and shelving.

8. Stairs.

E. Laminated members (straight or curved members built up o parallel glued laminated boards or planks; used untreated o treated with preservatives or fire-retardant treatments): 1. Large buildings:

(a) Trusses, arches, rigid frames.

(b) Beams and girders.

(c) Columns

(d) Purlins.

2. Bridges and trestles:
(a) Beams and girders.
(b) Caps and sills.
(c) Posts and columns.

3. Docks and wharves:

(a) Beams and girders.
(b) Caps and sills.

(c) Posts and columns.

F. Plywood (a crossbanded assembly made of layers of veneer veneer in combination with a lumber core or plies joined wit an adhesive; manufactured with moisture-resistant glues fo severe exposure conditions):

1. Structural uses:

(a) Wall and roof sheathing.
(b) Subflooring.