I found microbial growths in a vented attic. The house was 21 years old, original roof. The venting appeared to be properly installed. The ridge vents had wide gaps at the top. The enclosed soffits were not blocked with insulation, but there was microbial growths on the sheathing. Normally its caused from lack of or blocked vents. Any suggestions. Click to Enlarge 52.57 KB Click to Enlarge 60.33 KB Click to Enlarge 57.73 KB Click to Enlarge 61.53 KB Click to Enlarge 38.4 KB