The wood stove flue pictured here is in direct contact with roof tar paper, a clear safety issue.  If you’ve ever tried to light tar paper, you’d find it makes great fire starter!  Double-wall metal flues typically require at least two (2) inches “free and clear” of combustible materials for safety reasons.  This was discovered at a recent home inspection in Friday Harbor on San Juan Island.  Further evaluation and repair by a qualified contractor was advised for safety reasons.