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I did a bid today on 2 big 4-plexes. The wood siding had mildew growing on it where the siding met the roof deck. There is about 7 dormers on each 4-plex & the mildew was along every wall about 1 foot up from the roof deck. What is the cause of this problem?

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...jammin
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5,234 Posts
Are you sure it's mildew and not a blackened splash-back from the rain hitting the roof?
They can look very similar
The mildew however, usually won't just wipe off

If it is mildew....
What type of paint? How old? Type of roof?
What direction do the walls face, getting it all around or on one side, shade or sun, groves of trees nearby, bushes, etc...
I suspect it's still rain splashing back, but we need to find out why it's growing mildew
 
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