Dear All, I am building an extension with a flat roof, two skylights. My living room has floor to ceiling windows that look out over the garden... so my beautiful view will be a lot uglier now. The roof is going to be zinc (because of high levels of lead theft round here) but the architect has suggested I have a living (sedum) roof instead. It will look great, but I'm worried about maintenance Do you have one? Are they high maintenance? Do they cost a lot more? Advice very gratefully received. Thanks!