Snow is melted because the skylight panel is not thermally broken and therefore conducts heat/cold through the panel.

Heat Loss Through Fiberglass Skylights

Another example of problems with fiberglass skylights

The picture in this blog post shows a fiberglass skylight with a light covering of snow. Notice how all snow is melted at the grid lines. The reason for this is because the aluminum that is located on the inside of the panel is not thermally broken and therefore conducts heat/cold through the panel. This shows the heat loss from the building directly through the aluminum support structure. Also note the fiber blooming in the exposed fiberglass.

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