I had a problem in the winter with the cold so I cut a peice of 4" foam to fit the shape of the skylight and got some white plastic from Wal Mart and sprayed glued it to the foam used twe sided tape on the edges to hold it in. it kept falling out because it is sloped on the edges. I als made the same for my two roof vents, they stay in with pressure they are not sloped. sure saved some heat in the 16 below winter. but sure makes it dark..
the same products can be bought but high price for what it is
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