I film frost accentuated with hoar frost on the cars.
Frost pattern on roof.
2 the car roof cools radiatively.
A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost.
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.
And the roof of another.
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.
The biggest tell tale i see are icicles hanging from gutters and roof overhangs.
The overhang porch and garage keep ice on them longer.
In other words the sequence might be as follows.
As it cools below 35 degrees water condenses on it.
Patterns on roof hood window and mirror.
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26f degrees nov 19 2014 6 45 am.
Frost pattern on roof roofing gutters and all waterproofing anywhere.
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.
Closer building in foreground is unheated thus no odd pattern.
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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.
1 initially the air and the car are at temperature 37 f and the dew point is 35.
Morning on the spring equinox the first day of spring brought a few gifts from winter.
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.