Quick answer
Fire season and gutters in the Tri-Valley: From September through November, Diablo winds pack the driest debris of the year into gutters right when ember risk peaks, and UC ANR calls debris in gutters one of the greatest fire hazards for a building. Metal gutters beat vinyl, which drops burning material to the ground, but a full metal gutter still holds flame at the roof edge. So the priority order is: keep the gutters clear through fire season, replace vinyl with metal, pull out any foam inserts, and use only all-metal guards. Call (925) 905-9555 or get a free quote online.