I have renovated and planned with the architect to use the roofspace above the lounge room as a roof-graden for eg grasses or shrubs. It was covered with a waterproof membrane and has drainage. The builder and architect have now warned me that it is not very strong and I can really only put things that can be lifted (eg plastic pots) around the edges.
This presents me with a dilemma - I really wanted to make it a useful space. Any creative ideas of what I can do ?