Take a look at the big picture on a site, not just your share of the job. If you can, sneak a peak inside the wall cavity, where outdoor air comes in contact with the cavity side of the cooled interior surface. Unless you know that the design, materials, and construction of the building will minimize moisture, demand a waiver of liability before you start work. If mold develops later, you could be held liable. If you see mold through wallpaper, leave the paper in place until you get a professional opinion.
Chances are, if it s reached that point, it s a serious problem.
Don t eat on the jobsite. That ham on rye may come with a sprinkling of microscopic mold spores the quickest way to make yourself sick. Wash your hands thoroughly and frequently. Consider wearing disposable coveralls, masks, and shoe covers. If you see a large area of mold, stop work and report it immediately.