23
GROUND THAW SETUP CHARTS, cont.
TEMPERATURE:
-20° F or lower/ -29° C or lower
LAYERS OF BLANKETS TO USE:
DOUBLE (R12 insulation factor)
SOIL CONDITION:
Gravel or Sand (good drainage)
Frost Depth
12"
24"
36"
48"
60"
Hose Spacing**
16"
16"
16"
16"
16"
Hours to run
24
48
72
96
120
"Hose spacing is measured inches on center
TEMPERATURE:
-20° F to lower/ -28° C or lower
LAYERS OF BLANKETS TO USE:
DOUBLE (R12 insulation factor)
SOIL CONDITION:
Clay or Silt (poor to moderate drainage)
Frost Depth
12"
24"
36"
48"
60"
Hose Spacing"
16"
16"
16"
16"
16"
Hours to run
24
48
72
96
120
"Hose spacing is measured inches on center
31
