John Dirks Jr Posted September 15, 2011 Report Share Posted September 15, 2011 The first thing that caught my attention was staining on the sheathing and sidewall. At first I was thinking leaking flashing. A closer look revealed the gas furnace flue was loose at the collar where it passes through the roof. I'm thinking the stains are from condensation caused by warm flue gasses getting into the cold attic in the winter. What's you opinion on that idea? Click to Enlarge 45.85 KB Click to Enlarge 43.46 KB Click to Enlarge 45.58 KB Click to Enlarge 53.42 KB Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted September 15, 2011 Report Share Posted September 15, 2011 Sure. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted September 15, 2011 Report Share Posted September 15, 2011 That's a reasonable assumption. The drywall would be a different temp than the OSB, so there would be less condensation there. But there's not much doubt that the leaky vent pipe is to blame. Quote Link to comment Share on other sites More sharing options...
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