The rear roof in my Chalet bows inward when its warm inside and cold outside.? Thats happening because when the inner roof skin warms up it expands, and the outer roof skin gets cold it contracts.? I don't know if all roofs do this, but maybe with better weatherstripping you don't notice it, or maybe I got some moisture in the inner roof skin (its wood) and that causes it.
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I just got a flat stick made of oak, tapered the end, and jam it straight up into the gap between the roof halves.? It bends the roof back outward and closes the gap.
