Structural Rodent Exclusion Los Angeles

Roof rats (*Rattus rattus*) and Norway rats (*Rattus norvegicus*) enter Los Angeles structures through openings as small as 0.5 inches in diameter. In older hillside homes throughout Silver Lake, Los Feliz, and Highland Park, tree canopies and Spanish barrel-tile rooflines provide direct vertical pathways to attic cavities. In coastal marine-layer moisture zones like Venice, as well as suburban foundations in Sherman Oaks and Woodland Hills, crawlspace sub-floor vents frequently corrode, allowing exterior rodents direct ingress beneath floorboards where electrical wiring and plumbing lines run.

Structural exclusion establishes a permanent barrier rather than relying on monthly rodenticide traps. Baiting programs leave dying rodents inside drywall voids, creating decomposition odors and pest-borne secondary parasites, while consumer snap traps fail to address continuous exterior entry paths. If a structure has unsealed dormer eaves or broken crawlspace screens, trapping alone creates an endless replacement cycle as exterior populations migrate inward. Structural sealing solves the root mechanical failure by placing rigid 16-gauge, 0.25-inch galvanized wire mesh and metal flashing over foundation weep holes, plumbing penetrations, and fascia gaps.

The process follows a sequential 4-step deployment: 1. Full envelope inspection from foundation sill plates to roof ridgelines; 2. Precision mechanical installation of heavy-gauge hardware cloth and masonry patch over detected gaps; 3. Interior trapping inside attics and sub-floors to clear any trapped rodents without interior chemical baiting; 4. Final smoke-testing or light checks on sealed vents to verify complete structural integrity across properties in Brentwood, Mid-City, and Echo Park.