Green Roofs, Waterproofing Systems

i was always told early on, iwe you'll be really careful with green roofs, cause they always leak. And te flat roofs always leak. I suppose people, theyre still sort of ne ness probably, and dureced,. Now, bat technology, the nactural, the building systems have finally caught up that they're reliable enough to be able to sustain er, even not optimately designed systems, green roof systems, without leaking.