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Below is the EMC table and chart.

From the US Dept. of Agriculture Wood Handbook, “Wood as an Engineering Material”
Humidity recommendations range from 30% – 50% in a building.
Temperature recommendations range from 60°F – 80°F in a building.
If ambient conditions stay within these recommendations, the moisture content of wood stays between 6% and 9%
and the amount of expansion and contraction of wood is limited.

Examples: (1) Conditions in a warehouse are 60% relative humidity at 50°F.
Dry wood is left in the warehouse for an extended period of time.
The wood will pick up moisture until 11.2% MC is reached, regardless of wood species and initial moisture content.
(2) Lumber at 7.7% will not change its moisture content if kept at 40% relative humidity and 70°F.
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Relative Humidity EMC Table
T °F 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
30 1.4 2.6 3.7 4.6 5.5 6.3 7.1 7.8 8.7 9.5 10.4 11.3 12.4 13.5 14.9 16.5 18.5 21.0 24.3
40 1.4 2.6 3.7 4.6 5.5 6.3 7.1 7.8 8.7 9.5 10.4 11.3 12.4 13.5 14.9 16.5 18.5 21.0 24.3
50 1.4 2.6 3.6 4.6 5.5 6.3 7.1 7.9 8.7 9.5 10.3 11.2 12.3 13.4 14.8 16.4 18.4 20.9 24.3
60 1.3 2.5 3.6 4.6 5.4 6.2 7.0 7.8 8.6 9.4 10.2 11.1 12.1 13.3 14.6 16.2 18.2 20.7 24.1
70 1.3 2.5 3.5 4.5 5.4 6.2 6.9 7.7 8.5 9.2 10.1 11.0 12.0 13.1 14.4 16.0 17.9 20.5 23.9
80 1.3 2.4 3.5 4.4 5.3 6.1 6.8 7.6 8.3 9.1 9.6 10.8 11.7 12.9 14.2 15.7 17.7 20.2 23.6
90 1.2 2.3 3.4 4.3 5.1 5.9 6.7 7.4 8.1 8.9 9.7 10.5 11.5 12.6 13.9 15.4 17.3 19.8 23.3
100 1.2 2.3 3.3 4.2 5.0 5.8 6.5 7.2 7.9 8.7 9.5 10.3 11.2 12.3 13.6 15.1 17.0 19.5 22.9