Step-by-Step Instructions and Pictures of Why Insulated Window Glass Fogs

By Spike Carlsen
What is double-pane or Thermopane glass, how does it work and what causes it to fail? Read an overview on why insulated window glass fogs.
From The Family Handyman
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Why Insulated Window Glass Fogs
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Water Damage
Perimeter seals can deteriorate when they sit in water; bottom seals are particularly vulnerable. Glass should be elevated up and away from the window sash (and any infiltrating water) with small setting blocks. Weep holes or channels should be included to promote drainage.
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