Why Is There Frost On Some Roofs And Not Others

Frost does not form on well is concrete.

Why is there frost on some roofs and not others.

Once in the attic it warms the air over the living space. Regardless of the cause both situations are not good. The concrete also does not evapotranspire like vegetation. This simple answer is that the attics with no frost are warmer.

This is due to the cooling properties of evaporation and the inability of the glass and metal to retain heat. That heat then conducts up all the way to the shingles. Look at the entirety of your roof is the frost melting unevenly and not due to the sun s heat. White frost forms when there is a relative humidity above 90 and a temperature below 8 c 18 f and it grows against the wind direction since air arriving from windward has a higher humidity than leeward air but the wind must not be strong or it damages the delicate icy.

That warm air makes contact with the roof deck and warms it up. In some cases frost forms even before the temperature drops below 32 degrees fahrenheit. When moisture makes contact with the freezer s evaporator coils located behind the back panel of the fridge or freezer it triggers. One reason is because the concrete is not well exposed to the air like just as importantly the concrete retains some of its heat gained during the day.

This leaves a border of frost on the outside edges of the living area. Homes that let heat escape more rapidly than others will keep ice on the overhangs but not over the living area. If the morning sun directly hits your home and not your neighbors lack of frost may just be attributed to the sun s heat. The overhang porch and garage keep ice on them longer.

Yes the absence of frost is an indicator of heat loss. Because their ceiling isn t air sealed or insulated well enough to keep a lot of heat from escaping into the attic. White frost is a solid deposition of ice that forms directly from water vapour contained in air. That heat loss can come from less insulation or from warm air leaking up through the ceiling.

As nighttime cooling occurs the soil in many cases is warmer than the surrounding air. Your attic should generally be as close to the same temperature as the outside. You may be able to troubleshoot the issue and be frost free. A well insulated attic floor will keep the heat in the home better making the roof thaw evenly.

A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost.