scrump747

Hey Brian, The wind prevails from the opposite direction. It it just dark staining, not mildew like. It is just grey like coloring that is obviously in vapor form that eventually stained the siding...

Hello All, From a newbie on this forum... Has anyone seen or can you explain... On a grey house, stucco siding, crawlspace. Above the crawlspace vents (only on the southwest side of the house) there is what seems to be staining on the stucco from some vapor rising out of the crawlspace. There are vents all around the house, and there are only 3 vents that show this staining. The furthest southwest is the worst, and as one moves north, the staining gets progressively less, until the 4th vent shows no staining. This house is in Danville, CA, an area noted for its very hot and dry summers and relatively wet winters. The crawlspace was moist upon inspection. There is not a furnace or anything else other than plumbing and HVAC ducts in the crawlspace...Thanks. mark