I''''m living in the dome my father built 25 years ago and its time for a new roof. There is clearly moisture build up problems at the top of the dome around the coopala, the plywood has delaminated and on area is sagging. Ive found many sites saying that the moisture buildup/lack of venting is an issue but I have yet to see a real solution to this problem. If anyone has ideas it would be appreciated.
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Have a look at the Dome vetilation page, It's simply a matter of allowing the moister to escape. Can you give me any info on winter temps in your area? The bigger the difference in inside/outside temp the more of an issue this can be. As a last resort you could use a dehumidifier in the very top of the dome (not the best option though)