Konrad Posted May 17, 2004 Report Share Posted May 17, 2004 This is a house in a buddy's neighborhood. We don't have very many stone houses like this, but the ones that I see often have this dark coloring on them. Is it a bacteria or fungus or something? What would take it off? Is there any reason it only develps on the east and west elevations of the house, but not the north or south? These stains in this photo are the west elevation. Download Attachment: DCP_0318.JPG 77.32 KB Quote Link to comment Share on other sites More sharing options...
Vince Santos Posted May 17, 2004 Report Share Posted May 17, 2004 Could that be Efflorescence? Quote Link to comment Share on other sites More sharing options...
charlie Posted May 17, 2004 Report Share Posted May 17, 2004 I see this all the time in the NW---especially on Sandstone. It is most likely a lichen and I suspect that it shows up where there isn't an overhang or other source of moisture. Quote Link to comment Share on other sites More sharing options...
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