In a certain place on our house where the siding meets the roof from a lower level, moss is starting to grow.
Is there anything I can treat the wood with at that juncture to hinder this?
Thanks in advance.
You need to wash this area at least once a year to remove the moss/mildew that is growing in this area. That is the way to combat this as if allowed to get a foot hold mildew will grow any place the conditions are right for it. All exterior coatings have mildew resistance but that does not make them mildew/moss proof.