DEW POINT CALCULATION CHART
 
 
RELATIVE
HUMIDITY
AMBIENT AIR TEMPERATURE - FAHRENHEIT
  
20°
30°
40°
50°
60°
70°
80°
90°
100°
110°
120°
  
90%
 18 28 37 47 57 67 77 87 97 107 117  
85%
 17 26 36 45 55 65 75 84 95 104 113  
80%
 16 25 34 44 54 63 73 82 93 102 110  
75%
 15 24 33 42 52 62 71 80 91 100 108  
70%
 13 22 31 40 50 60 68 78 88 96 105  
65%
 12 20 29 38 47 57 66 76 85 93 103  
60%
 11 19 27 36 45 55 64 73 83 92 101  
55%
 9 17 25 34 43 53 61 70 80 89 98  
50%
 6 15 23 31 40 50 59 67 77 86 94  
45%
 4 13 21 29 37 47 56 64 73 72 91  
40%
 1 11 18 26 35 43 52 61 69 78 87  
35%
 -2 8 16 23 31 40 48 57 65 74 83  
30%
 -6 4 13 20 28 36 44 52 61 69 77  
 


SURFACE TEMPERATURE AT WHICH CONDENSATION OCCURS
  
   
   
  DEW POINT  
   
  Temperature at which moisture will condense on surface. No coatings should be applied unless surface temperature is a minimum of 5° above this point.Temperature must be maintained during dry through.
 
 
   
  EXAMPLE  
   
  If air temperature is 60°F and relative humidity is 50% the dew point is 40°F.No coating should be applied unless surface temperature is 45° minimum.
 
 
 
 
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