I wanted at least 4" of cal sil under the dome, and got two boxes in 1.5" thick boards. Any reason to go over 4.5"? I have enough boards for 6", but I'm concerned about settling under the dome with that much (I think Lee encountered that) and suspect there's a law of diminishing returns after 4.5" of insulation under the dome. Any point to 6"?
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6" insulation under dome?