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    Dew Point Calculator

    Dew Point: Conditions Under Which Condensation Occurs

    Under certain conditions, moisture in the air can condense on roof surfaces during or after coating application causing poor adhesion, blisters or inhibiting proper curing. Where dew point limitations are referenced on AIM Product Data Sheets, please use the following reference.

    It's simply physics that all building products are ideally applied within a certain temperature range and moisture index range. One of the more important calculations to determine before applying product is the Dew Point, namely, the point at which condensation occurs. It is important to realize that the Dew Point temperature and ambient air temperature are not the same...

    The dew point temperature is just that, a temperature. But the air temperature and dew point temperature are two very different things. The dew point temperature is the point at which the air must be cooled in order for the air mass to become saturated.

    The dew point is used because it's a great indicator of the moisture content of the air, or humidity. The higher the dew point temperature; the higher the humidity.

    Dew Point temperature is the intersection of Ambient Air temperature and Relative Humidity. As an example, in the chart below, if air temperature is 60°F and relative humidity is 50% the dew point is 40°F.

    Table used to calculate Dew Point

      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



    Restrictions for AIM coatings:
    No coating should be applied unless surface temperature is 40° minimum and 125° F maximum. Certain AIM coatings may have different requirements for high and low temperature application. See Product Data Sheet for details.




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