When I was a kid the only roofs with show on were the ones who couldn't afford to heat their homes...There was no loft insulation back then so any heat naturally migrated to the loft space which melted or prevented the snow from sticking in the first place....As said fake news there's plenty houses round my ways with little or not much snow on the roofs just means the insulation is inefficient in most cases...
Regards BL
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