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Old 4 weeks ago
  #2
Lives for gear
 
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One thing I remember learning was the insulation between leaves needs to be left uncompressed as compression will start to bridge the two leaves and provide a flanking path - the more compressed the insulation is the worse it will be. Taking that information and using to your advantage, if you fill the gap with insulation but make sure to compress it it will both absorb the unevenness of the irregularities and bridge the glass with the board and leave the glass and board working together as a single leaf.