To prevent damage from water, the roof must first be covered by plastic sheeting. Then, after a layer of rice chaff is laid to assist drainage and ventilation, hollow bricks are arranged to form simple flower beds.
為了防止水份滲透，及樹根、土壤侵蝕樓台，設置屋頂花園要先在地面鋪一層塑膠布，在塑膠布上放置空心磚，圍成簡單的花壇，然後在花壇上鋪一層稻穀，以促進排水和通風。