What is the threshold area for a rooftop garden to require a hose connected to an approved water supply?

The threshold area for a rooftop garden to require a hose connected to an approved water supply is indeed 250 square feet. This requirement is based on fire safety regulations that aim to ensure adequate water supply for firefighting measures in larger green roof spaces. When a rooftop garden exceeds 250 square feet, the potential for fire load and the complexity of managing landscape materials increase, necessitating the connection to a reliable water source. This provision helps in maintaining not only the safety of occupants but also assists emergency responders by ensuring they are equipped to manage any fire-related incidents effectively.