Mike Lamb Posted September 12, 2009 Report Share Posted September 12, 2009 The second floor of this 1982 home had dark staining at the carpet along the perimeter of all walls. Interior walls, exterior, closets, etc. I would describe it as soot so I'm thinking candles and more candles with negative pressure but I don't know. Click to Enlarge 45.1 KB Click to Enlarge 33.9 KB Link to comment Share on other sites More sharing options...
waynesoper Posted September 12, 2009 Report Share Posted September 12, 2009 lack of vacumming and cleaning. They were slobs. Link to comment Share on other sites More sharing options...
randynavarro Posted September 12, 2009 Report Share Posted September 12, 2009 Air movement between floors and walls. When the HVAC (or exhaust fan, or window fan is exhausting through a window or anything that creates pressure differentials in each room) is running, air is getting drawn through the carpet. The carpet is actually acting like an air filter. Diagnosing exactly can be a bit tricky. One guess: the bedroom doors are tight to the floor thus blocking return airflow to the central register. The air is trying to get back to the air handler via some path. . . namely the areas you're seeing as dark carpet. Link to comment Share on other sites More sharing options...
MMustola Posted September 12, 2009 Report Share Posted September 12, 2009 That is pretty common around here. They use the space between studs and joists for cold air return ducts. The edges of the carpet act like a filter causing those stains along the baseboards Link to comment Share on other sites More sharing options...
Mike Lamb Posted September 12, 2009 Author Report Share Posted September 12, 2009 Click to Enlarge 43.19 KB Maybe. But the main runway and foot traffic areas etc. were clean. This stuff would not be clean no matter what shampoo you use if they were general slobs. Link to comment Share on other sites More sharing options...
Mike Lamb Posted September 12, 2009 Author Report Share Posted September 12, 2009 Thanks, Randy, Mark and Wayne. Link to comment Share on other sites More sharing options...
Rocon Posted September 12, 2009 Report Share Posted September 12, 2009 This is a very good article about ghosting, and filtration. http://www.buildingscience.com/document ... m=ghosting Link to comment Share on other sites More sharing options...
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