If you get a lot of wind on your rooftop, choosing furniture with sufficient weight is crucial to prevent it from becoming a dangerous projectile. The necessary weight isn't a single number but depends on several factors. First, consider wind load: a 50 mph gust exerts significantly more force than a 20 mph breeze. Furniture design plays a major role; pieces with solid bases, low centers of gravity, and aerodynamic shapes are inherently more stable. Materials matter too—concrete, stone, and thick, powder-coated steel are naturally heavier and more resilient than lightweight aluminum or plastic.
For general stability on exposed rooftops, aim for substantial pieces. A dining table should typically weigh over 100 lbs (45 kg), while chairs and loungers should be a minimum of 30-40 lbs (14-18 kg) each. However, weight alone isn't always the perfect solution. The most effective strategy is combining inherent weight with positive anchoring. Look for furniture with built-in anchor points or designs that allow you to add straps, cables, or weights to secure them directly to the rooftop structure or using weighted sandbags. Always check your building's weight restrictions for rooftops before making any purchases. Ultimately, selecting heavy, well-designed furniture and properly securing it is the best defense against strong urban winds, ensuring your outdoor space remains safe and intact.