The splendid photographs with which this publication is profusely illustrated did nothing to enlighten me as to how to construct a "green" roof.
Points I looked for were tables of joist sizes to support the materials being used, weights of different materials, both wet and dry. What stops the "garden" from falling of the edge of the roof? Where can you get the materials - don't bother with the U.K suppliers mentioned in the back of the book - they don't bother to reply, well, not to a potential customer in the North of England anyway.
I got the info about joist sizes and weights, with a bit of guesstimating, from the Building Regs (local library)
Found this book a very expensive investment.
Found some real information via videos online at FLORDEPOT INTERNATIONAL
- it's a German company. With the information I learnt I have just completed two roofs - sat waiting for the Seedum to grow and cover the roof. Fingers crossed.