I’d treat sprinkler protection as a mix of placement, materials, and a little routine maintenance. Urban outdoor furniture often sits in shared courtyards, rooftops, or sidewalk areas where sprinkler heads are designed for plants, not seating. Start by watching the sprinkler pattern for a few days so you know which pieces get hit directly and where water pools. If possible, move furniture just outside the spray zone or rotate it so the most vulnerable parts are not constantly soaked. For fixed furniture, adjust sprinkler heads so they point at landscaping rather than benches, tables, and cushions. A simple change in angle or a shorter watering cycle can make a big difference.
Use breathable waterproof covers rather than plastic tarps that trap moisture. Good covers should fit securely, allow some airflow, and be easy to remove so you can dry the furniture after rain or watering. Elevate wooden or metal legs slightly with rubber feet, small blocks, or adjustable glides to keep them out of standing water. Check that the area drains well and clear any clogged channels or planters that send runoff toward seating. For metal furniture, touch up scratches and apply a rust-resistant coating; for wood, keep it sealed and re-oil it as needed. Cushions should be stored or covered when not in use, and any standing water should be wiped off promptly. If the sprinkler system runs on a timer, reduce overspray and water early in the day so furniture has time to dry. A quick weekly check of spray direction, drainage, and cover condition will prevent most sprinkler damage before it starts.