A well insulated attic floor will keep the heat in the home better making the roof thaw evenly.
Frost pattern on roof.
Patterns on roof hood window and mirror.
As it cools below 35 degrees water condenses on it.
And the roof of another.
The biggest tell tale i see are icicles hanging from gutters and roof overhangs.
Gulf coast of mississippi.
Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing.
26f degrees nov 19 2014 6 45 am.
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.
The overhang porch and garage keep ice on them longer.
Homes that let heat escape more rapidly than others will keep ice on the overhangs but not over the living area.
In other words the sequence might be as follows.
Closer building in foreground is unheated thus no odd pattern.
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See the white of the hoar following a pattern set down by the thin layer of film frost.
If the morning sun directly hits your home and not your neighbors lack of frost may just be attributed to the sun s heat.
Frost pattern on roof roofing gutters and all waterproofing anywhere.
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A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost.
This leaves a border of frost on the outside edges of the living area.
2 the car roof cools radiatively.
The roof of one car.
Morning on the spring equinox the first day of spring brought a few gifts from winter.
I film frost accentuated with hoar frost on the cars.
However if nothing is different about your home compared to your neighbors you may have a problem.