MOLD! Here's a great example of what mold removal looks like. It looks easy, but this guy has all the gear and experience for it. I see this sheathing mold ALL THE TIME, to the point where people think it's supposed to be that way. This video shows what to do about it.
Mold spores are everywhere, outdoors as well as inside your house. You breathe millions of them every day. Luckily, mold spores only form mold when they land on a moist surface. That means that if you can keep the interior of your home dry, you can avoid having any problems with mold. The best way to prevent mold in your home is to reduce moisture, by cleaning gutters, patching leaks, venting bathrooms and kitchens, etc. (1)
