Structural Lumber Grading

Question 1

several agencies certified to grade lumber by:

Answer 1

American Lumber Standards Committee

Question 2

grading is done at ___,

via ____.

Answer 2

the sawmill,

visual inspection/machine.

Question 3

2 primary classifications for softwood

Answer 3

yard lumber,

factory and shop lumber.

Question 4

yard lumber used for

Answer 4

structural + rough framing

Question 5

factory and shop lumber used for

Answer 5

doorframes, windows, finishing items.

Question 6

yard lumber subdivided into

Answer 6

boards/
dimension/
timber

Question 7

yard lumber groups used for structural purposes:

Answer 7

dimension + timber

Question 8

yard lumber:
2-4” thick, 2-4” wide.
ex. 2x2

Answer 8

1

Question 9

yard lumber:
2-4” thick, 4” wide
ex. 2x4

Answer 9

2

Question 10

group #2 is subdivided into:

Answer 10

“construction, standard, and utility.”

Question 11

yard lumber:
2-4” thick, 5”+ wide
ex. 2x6, 2x8

Answer 11

3

Question 12

yard lumber:
beams and stringers
≥5” width,
w depth not > width+2” .

Answer 12

4

Question 13

yard lumber:
posts and timbers.
≥5x5”,
w depth not > width+2” .

Answer 13

5

Question 14

to label allowable bending stress and modulus of elasticity.

Answer 14

machine-stress-rated lumber

Question 15

factory and shop lumber:
nominal thickness,
and graded per:

Answer 15

<1” nominal thickness,

graded per appearance/use.

Question 16

factory and shop lumber:

typ grades:

Answer 16

select/common

Question 17

factory and shop lumber:

select grades:

Answer 17

B&Better (free of knots)
C Select
D Select

Question 18

factory and shop lumber:

common grades:

Answer 18

no. 1 (commonly best)
no. 2
no. 3
no. 4
no. 5
* size/character of the knots.

Question 19

lumber is ordered and priced by

Answer 19

board foot.

Question 20

board foot

Answer 20

is a quantity of lumber,
= 12x12x1in thick.
by nominal size.