Structural Lumber Moisture

Question 1

Moisture Content:

definition

Answer 1

water weight in wood,

compared to weight in oven dried wood.

Question 2

moisture content affects:

Answer 2

shrinkage,
weight,
strength.

and overall withdrawal resistance of nails.

Question 3

fiber saturation point.

Answer 3

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

Question 4

avg moisture content of all wood

Answer 4

30%

Question 5

above 30% moisture content

Answer 5

dimensionally stable

Question 6

below 30% moisture content

Answer 6

shrink

Question 7

ideally, moisture content @ install is equal to:

Answer 7

humidity to which it will be exposed

Question 8

dry lumber moisture content:

Answer 8

≤ 19%

Question 9

kiln dried lumber moisture content:

Answer 9

≤ 15%

Question 10

wood shrinks most

Answer 10

perpendicular to grain

Question 11

position in log where piece is cut affects:

Answer 11

shrinkage characteristics