Structural Lumber Grading Flashcards Preview

BD_Ballast > Structural Lumber Grading > Flashcards

Flashcards in Structural Lumber Grading Deck (20)
1

several agencies certified to grade lumber by:

American Lumber Standards Committee

2

grading is done at ___,
via ____.

the sawmill,
visual inspection/machine.

3

2 primary classifications for softwood

yard lumber,
factory and shop lumber.

4

yard lumber used for

structural + rough framing

5

factory and shop lumber used for

doorframes, windows, finishing items.

6

yard lumber subdivided into

boards/
dimension/
timber

7

yard lumber groups used for structural purposes:

dimension + timber

8

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

#1

9

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

#2

10

group #2 is subdivided into:

“construction, standard, and utility.”

11

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

#3

12

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

#4

13

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

#5

14

to label allowable bending stress and modulus of elasticity.

machine-stress-rated lumber

15

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

<1” nominal thickness,
graded per appearance/use.

16

factory and shop lumber:
typ grades:

select/common

17

factory and shop lumber:
select grades:

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

18

factory and shop lumber:
common grades:

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

19

lumber is ordered and priced by

board foot.

20

board foot

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