The overhang porch and garage keep ice on them longer.
Frost pattern on roof.
This leaves a border of frost on the outside edges of the living area.
A well insulated attic floor will keep the heat in the home better making the roof thaw evenly.
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1 initially the air and the car are at temperature 37 f and the dew point is 35.
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.
2 the car roof cools radiatively.
Patterns on roof hood window and mirror.
However if nothing is different about your home compared to your neighbors you may have a problem.
Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing.
Homes that let heat escape more rapidly than others will keep ice on the overhangs but not over the living area.
As it cools below 35 degrees water condenses on it.
Morning on the spring equinox the first day of spring brought a few gifts from winter.
Gulf coast of mississippi.
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.
The biggest tell tale i see are icicles hanging from gutters and roof overhangs.
I film frost accentuated with hoar frost on the cars.
A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost.
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The presence of snow and frost melting patterns on a roof can indicate attic warming.
In other words the sequence might be as follows.
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.
26f degrees nov 19 2014 6 45 am.
Closer building in foreground is unheated thus no odd pattern.