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Flashcards in Structural Lumber Moisture Deck (11)
1

Moisture Content:
definition

water weight in wood,
compared to weight in oven dried wood.

2

moisture content affects:

shrinkage,
weight,
strength.

and overall withdrawal resistance of nails.

3

fiber saturation point.

cell walls
are completely saturated,
but no water in cells.

4

avg moisture content of all wood

30%

5

above 30% moisture content

dimensionally stable

6

below 30% moisture content

shrink

7

ideally, moisture content @ install is equal to:

humidity to which it will be exposed

8

dry lumber moisture content:

≤ 19%

9

kiln dried lumber moisture content:

≤ 15%

10

wood shrinks most

perpendicular to grain

11

position in log where piece is cut affects:

shrinkage characteristics