I heard the opinion: "if there is snow on the roof, then there is no heat loss." Why don't I believe in this theory?

I never paid attention to the snow on this side. But after becoming a self-builder, you look at everything differently.

Earlier, about snow, I only heard that it cannot be eaten if it is yellow 🤣. But my construction broadens my horizons.

Even at the stage of roofing, in my house, I came across information that that the absence, in winter, of snow on the roof is a sign of poor thermal insulation.

And indeed, within the limits of even our small SNT, you can observe both snow-covered roofs and "bare" ones.

But does this theory always work?

I will consider my house, as I know all the features of its design.

✅ Ventzazor.

This is part of the roof structure that is not done on all construction sites.

✔ In a house with a cold attic, it's not needed.

✔ But if the roof is attic, like mine, then this ventilation gap, for airing the under-roof space, is simply necessary.

So the question arises: even if the heat intensively passes through poor insulation, how will it affect the melting of snow, if before that it is simply "blown out" in the ventilation gap?

I only see two options here:

• Or the insulation is completely "full of holes".
• Either this vent gap is simply not there, which is a gross mistake, but far from uncommon ...

Otherwise, in my opinion, even if there is snow on the roof of a mountain, this is not an indicator that there is no heat loss through it.

✅ And because of the roofing material, it may be the other way around.

For example, I have a metal tile. And even if there is no heat loss, snow can melt very intensely.

A good example was recently.

It's frosty outside, a lot of snow has piled up. But the sun is already spring, therefore it heats very well, and it acts instantly on a metal roof.

In just a few hours of active sun, all the snow melted on the roof, like in a frying pan. And heat loss has nothing to do with it.

These are my observations.

I would like to hear your opinion, write in the comments. Maybe I don't fully understand these processes? Always ready to learn and improve.

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