Ben H Posted February 28, 2012 Report Share Posted February 28, 2012 Exterior wall. Gas forced air. They had insulation stuffed around pipe, and I noticed this red corrosion. Anyone have a clue what it is? Click to Enlarge 37.07?KB Link to comment Share on other sites More sharing options...
Inspectorjoe Posted February 28, 2012 Report Share Posted February 28, 2012 WAG: Not corrosion but minute brick particles deposited from a wet saw? Link to comment Share on other sites More sharing options...
Ben H Posted February 28, 2012 Author Report Share Posted February 28, 2012 Would be a viable guess, if the house had brick. [] Link to comment Share on other sites More sharing options...
Tom Raymond Posted February 28, 2012 Report Share Posted February 28, 2012 That looks like condensate on the duct, maybe it's red ink from the paper on the insulation or paint from the edges of the OSB. Link to comment Share on other sites More sharing options...
Jim Katen Posted February 28, 2012 Report Share Posted February 28, 2012 Chalk line chalk. Link to comment Share on other sites More sharing options...
plummen Posted March 4, 2012 Report Share Posted March 4, 2012 Is that wall stack or some sort of single wall flue pipe? [:-magnify Link to comment Share on other sites More sharing options...
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