Structural Lumber Defects Flashcards
1
Q
lumber has defects bc
A
natural material
2
Q
defects are present in lumber, and occur during
A
manufacture
3
Q
most common.
classified by quality, size, occurrence.
over 10 types.
A
knots
4
Q
separation of wood fibers,
across or through growth rings,
result of improper seasoning.
A
check
5
Q
open area between growth rings,
contains resin.
A
pitch pocket
6
Q
lengthwise separation,
between or through growth rings.
A
shake
7
Q
sim. check,
except extends completely through.
typ. @ ends.
A
split
8
Q
bark/absence of wood,
on edge or corner of lumber,
from any cause,
A
wane
9
Q
common manufacturing defect.
caused by uneven drying
A
warping
10
Q
warping:
parallel to length of lumber,
inline w lumbers flat side.
A
bow
11
Q
warping:
parallel to length of lumber,
perpendicular to flat side.
A
crook
12
Q
warping:
across width,
deviation from true plane.
A
cup
