Are there any cost-cutting shortcuts for planting a green roof on my urban townhouse?

— Rachel Diamond, Harrisburg, PA

Answered by Mark Schrieber on August 25, 2009

What are the sustainable options for re-roofing our 30-year-old home?

— Jennifer Marks, Tiburon, CA

Answered by Cynthia Phakos on November 26, 2008

What's the difference between a green roof and a white roof?

— Angela Corcoran, Brooklyn, NY

Answered by Susan Wisniewski on May 2, 2008

What type of roof works best with spray-foam insulation?

— Eleazar, Brownsville, Texas

Answered by Mick Dalrymple on February 21, 2008

What type of roof should I choose in a hot climate?

— Hot in Albuquerque

Answered by Mick Dalrymple on January 17, 2008