That means there s heat loss likely due to poor insulation and or ventilation in the attic.
If snow stays on roof does that mean good insulation.
The snow is not affected by the heated house meaning that the attic floor is reasonably airtight and insulation is sufficient.
The best snowstorm for these observations will.
According to one anecdotal source a snowfall that measures about 0 07 inches in density or seven percent water volume has about the same insulation value as a standard batt of fiberglass insulation with an r value of 18.
If your roof gets a decent amount of snow on it make sure it s not melting in specific spots.
If your attic insulation is good the snow will stay on for a long while and actually will add insulation to the roof since snow is an insulator.