Tim Hance with All Islands Home Inspections discovered completely deteriorated OSB eave sheathing at a recent home inspection in Anacortes, WA. If your soffit sheathing is discolored, particularly adjacent the gutters, you may very well have water and insect damage requiring your attention and repair. Left unchecked, deterioration will continue and become more expensive with time. Keeping gutters clean and installing a metal drip-edge flashing detail will help prevent recurrence into the future.