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 Quote 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? Quote 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. [] Quote 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. Quote 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. Quote 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 Quote Link to comment Share on other sites More sharing options...
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