This is why Wu said it is best for landscapers or architects to be involved in the design and construction of rooftop gardens. At present interior designers design most gardens on old buildings in Taipei because landscapers and architects tend to focus on large projects, such as new buildings or park designs.
DO-IT-YOURSELF
Properly installed rooftop gardens require waterproofing, insulation, drainage, filter fabric, growth media, plant material, water storage and irrigation. Neither Wu nor Ongg were against DIY gardens but both recommended, "keeping it simple."
Instead of building a stationary garden, pots or containers that guard against leakage can be used, enabling gardeners to play with different designs, Wu said.
Other possibilities include creating a trellis system with one plant (such as grape vine) and bracing it with bamboo or steel. Those determined to use soil and plant vegetation need to first determine if the building's existing waterproofing is still intact and able to withstand large quantities of water.
Advice on waterproofing agents and root deterrent products is available from B&Q or the many flower markets in Taiwan.
Both Wu and Ongg recommend consulting a structural engineer or architecture association before undertaking any extensive roof garden projects that involve additional structural supports or complex waterproofing.
Similarly, major construction might require a permit form the city building administration.
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