tag:blogger.com,1999:blog-4584264484476081486.post4726398083052324888..comments2024-02-13T17:02:27.050-08:00Comments on Stewart Family: Of 4H Economics and Yurt RingsUnknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-4584264484476081486.post-40860324074347210952012-05-19T23:02:24.450-07:002012-05-19T23:02:24.450-07:00Answer: Drying rafters may play a role. They may ...Answer: Drying rafters may play a role. They may have shrunk up to about .1% which could lower the wooden ring up to 3/8". But it has become clear that the main issue is expansion of the metal roof. Metal expands in heat significantly more than wood. So what is happening is the roof panels get bigger on hot days and lift the metal ring (they are bolted to it) up. I documented this on my ring over the day recently. In the cool morning: little or no gap; mid day (about 75 degrees): 1/4" gap, evening (cooling off): 1/8" gap. The big gaps I was seeing a week or so ago were on really hot days in the 90's or so.Joehttps://www.blogger.com/profile/08383555490601623708noreply@blogger.com