What is the "rule" for irrigating a green roof garden?

— baruch weiss Farmersville, OH

Answered by Richard Heller on July 5, 2010

What is the most energy-efficient roof for my two-story home in a northwest suburb of Austin?

— Betty Saenz EcoBroker GREEN REALTOR Leander, TX

Answered by Alex Biyevetskiy on April 9, 2010