1. Structural Capacity: A green roof can weigh up to 100 pounds per square foot when fully saturated. As a result, the structural capacity of the building must be capable of bearing such weight, and this consideration must be factored into the initial design.
2. Maintenance: A green roof requires constant maintenance, including regular watering, fertilizing, pruning, and pest control. This ongoing upkeep can be a difficult task for building owners or managers.
3. Waterproofing: Green roofs require a waterproofing membrane to prevent water infiltration. If the membrane is not installed correctly, water penetration can cause significant damage to the building.
4. Irrigation: Green roofs require irrigation systems to ensure plant survival, but these systems can be challenging to install and maintain.
5. Excessive Heat: In urban areas, green roofs can exacerbate the heat island effect, where temperatures in urban areas are significantly warmer than their rural surroundings. This issue must be examined to ensure the benefits of the green roof do not create adverse effects.
6. Draining: Green roofs require proper drainage to prevent water from ponding on the surface, causing damage to the plant roots and poor building drainage.
7. Accessibility: Green roofs are generally not accessible to the public and are restricted to maintenance personnel. Their energy-saving and aesthetic benefits are limited.
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