Soffit Vents

Soffit vents are intake vents installed under eaves that allow fresh air into the attic; paired with ridge or roof vents they create airflow that reduces moisture buildup, helps control attic temperature, and prolongs roofing materials

Calculate required net free ventilation area (NFVA) from attic square footage and roof design—common guidance is 1/150 to 1/300 of attic area depending on balanced ventilation—and select vents whose listed NFVA totals meet or exceed that requirement distributed along the soffit

Common materials include vinyl, aluminum, and steel; vinyl resists rust and is low-maintenance, aluminum is lightweight and durable, and steel offers strength but can corrode if not coated; choose a style (continuous strip, individual vents, or perforated soffit panels) based on soffit construction and airflow needs

Many soffit vents are suitable for DIY installation using basic tools (drill, jigsaw or hole saw, measuring tape, screws), but ensure you follow vent-specific instructions, locate soffit joists to fasten to, and protect against cutting into electrical or plumbing; complex situations may require a professional

Choose vents with insect screens or baffles and install attic baffles/vent chutes to keep insulation away from airflow; regularly inspect for debris buildup and repair damaged screens to maintain clear intake pathways

Inspect soffit vents annually for blockages, damage, or loose fasteners, clean away debris with a soft brush or vacuum, and replace damaged screens or vents promptly to preserve attic ventilation

Individual soffit vents commonly fall into budget ranges under $50 to around $100 for higher-end or specialty options; total project cost is affected by vent type (continuous vs. individual), material, quantity needed, and any installation or contractor fees