Steven Hockstein Posted October 14, 2015 Report Share Posted October 14, 2015 I found this on the left side of a Cape Cod style home. This vertical discoloration is adjacent to a knee wall on the inside. There is no plumbing or mechanical equipment adjacent to the space. There is an eave attic in the lower area and the higher space is conditioned space. The mortar is discolored and weathered. is this some type of vapor drive? Has anybody seen this before? Click to Enlarge 69.16 KB Click to Enlarge 59.42 KB Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted October 14, 2015 Report Share Posted October 14, 2015 I've seen that before. On the house where I saw it, I pinned the cause to leaking ductwork between the first and second storeys. Vapor drive. In my case the knee wall had lath and plaster on each side and the joist cavity was contiguous with the kneewall cavity. Quote Link to comment Share on other sites More sharing options...
Marc Posted October 14, 2015 Report Share Posted October 14, 2015 I've seen something like it but it was due to a heavy stream of rainwater from above. Marc Quote Link to comment Share on other sites More sharing options...
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