A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost.
Frost pattern on roof.
Closer building in foreground is unheated thus no odd pattern.
Patterns on roof hood window and mirror.
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And the roof of another.
The biggest tell tale i see are icicles hanging from gutters and roof overhangs.
Homes that let heat escape more rapidly than others will keep ice on the overhangs but not over the living area.
2 the car roof cools radiatively.
26f degrees nov 19 2014 6 45 am.
The overhang porch and garage keep ice on them longer.
This leaves a border of frost on the outside edges of the living area.
However if nothing is different about your home compared to your neighbors you may have a problem.
In other words the sequence might be as follows.
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Gulf coast of mississippi.
Morning on the spring equinox the first day of spring brought a few gifts from winter.
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 roof of one car.
Snow frost and dew pattern analysis is a technique used in conjunction with other tests such as an infrared scan to identify problems in the roof assembly insulation.
The presence of snow and frost melting patterns on a roof can indicate attic warming.
1 initially the air and the car are at temperature 37 f and the dew point is 35.
Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing.
As it cools below 35 degrees water condenses on it.
After our recent record breaking snow here in the mid atlantic our house which i have been working on for over 3 decades had no icicles and lots of roof snow pack while my next door neighbor had melted patches in the roof snow pack and icicles almost instantly.
See the white of the hoar following a pattern set down by the thin layer of film frost.