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 TABLE 4-5
Schedule for Heat Treating Wood
to Control Damage by Powderpost Beetles
Time required
Total period of
to overcome lag
exposure after
Thickness after kiln has Additional Time then held
Relative
Lethal
kiln has
humidity
temperature
of timber attained lethal margin of
at lethal
attained required
required
temperature
safety
temperature
conditions
Percent
Hours
F
Inches
Hours
Hours
Hours
1.00
.50
2.50
.50
1.50
2.00
2.00
.50
1.50
4.00
2.50
3.25
100
130
.50
5.25
1.50
4.50
3.00
.50
6.50
1.50
3.00
.50
.50
2.00
1.00
2.00
4.50
2.00
.50
2.00
2.00
5.75
3.25
.50
2.50
125
2.00
7.00
4.50
.50
3.00
1.00
.50
1.50
6.00
8.00
2.00
2.00
1.50
6.00
9.50
120
80
3.25
2.50
1.50
6.00
10.75
3.00
4.50
1.50
6.00
12.00
1.00
.50
7.50
38.00
30.00
2.00
2.00
7.50
39.50
30.00
3.25
115
2.50
7.50
30.00
40.75
3.00
4.50
7.50
42.50
30.00
1.00
.50
1.00
5.50
4.00
2.00
2.00
1.00
7.00
4.00
125
2.50
3.25
1.00
4.00
8.25
3.00
4.50
1.00
4.00
9.50
1.00
.50
2.00
9.50
7.00
2.00
2.00
2.00
7.00
11.00
60
120
2.50
3.25
2.00
12.25
7.00
3.00
4.50
2.00
7.00
13.50
1.00
.50
9.00
45.50
36.00
2.00
2.00
47.00
9.00
36.00
2.50
115
3.25
9.00
36.00
48.25
3.00
4.50
9.00
36.00
49.50
4-47
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