Install roofline ventilation for moisture and ammonia control

Cut ventilation openings near the roofline of the coop and cover them with 1/2-inch hardware cloth. Duck coops need significantly more ventilation than chicken coops because ducks bring moisture in on their bodies after swimming, produce wet droppings, and breathe out humid air while sleeping in a pile. Without adequate airflow, condensation builds on walls and ceiling, creating perfect conditions for mold and respiratory disease.

Why It Works

Warm, moist air rises naturally. Roofline vents allow this moisture-laden air to escape while keeping ground-level air (where the ducks sleep) relatively draft-free. The goal is continuous air exchange without direct wind hitting the ducks. A general rule: provide at least 1 square foot of ventilation opening per 10 square feet of floor space, and err on the side of more ventilation rather than less.

Tips

• Place vents on at least two walls (ideally opposite sides) for cross-ventilation
• Cover all openings with 1/2-inch hardware cloth to prevent predator entry
• In winter, keep roofline vents open — ducks tolerate cold far better than they tolerate damp, stale air
• If you smell ammonia at duck level, ventilation is inadequate and must be increased immediately
• A moisture test: if condensation forms on the ceiling or walls, more ventilation is needed