Normal weathering course will develop cracks over a period of time and having plants may worsen the condition. The surface underneath the plates may remain damp and may contribute to drip leakage and corrosion.
In my case I realized the potential issue and did my own (DIY) water proofing using commercially available materials. If the plan is to use soil and direct planting is planned, different type of high cost water proofing is required. Better to take care of these issues before starting gardening. Safeguarding the house and the investment if much more important than the satisfaction gained out of gardening in the terrace.
I am growing vegetables / flowers on my balcony ( 8x6) in containers and bags and never faced any problem. I have used a stand on which placed are the bags. For seasonal flowers or short rooted vegetables plastic containers are best and easy to move for cleaning. A details cleaning can be done once a week which is good enough.
You can have a look of my balcony gardening on my personal blog.
All the best
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