Center for Green Roof Research at Penn State University
Welcome to the Horticulture website, our address has changed to http://horticulture.psu.edu. We are busy both updating content and moving to a new system of managing our site. We apologize for the inconvenience as some of the material you are accustomed
http://hortweb.cas.psu.edu/research/greenroofcenter/

American Hydrotech, Inc.
Hydrotech’s Green Roof, the Garden Roof Assembly is the latest innovation in roofing/waterproofing using MM6125 and 40+ years of successful installations around the world.
http://www.hydrotechusa.com/

BBS Green Roofing
Residential and commercial green roof contractors based in the UK. Includes portfolio.
http://www.green-roofing.co.uk/

Green Roofs for Healthy Cities
Green Roofs for Healthy Cities, Online Green Roofs information
http://www.greenroofs.org/

Roof Genius
Roof calculator, calculates a detail list of roof materials, and a complete estimate. Two ways to determine roof pitch. Offers tips and how to's on roofing. [Windows 95/98/2000/Me/XP/NT]
http://roofgenius.com/

FlorDepot International
FlorDepot green roofs with green roof DIY kit
http://www.flordepot.com

Decra Roof Systems:
Roof coverings using lightweight roof tiles for all roofs down to a ten degree pitch. UK.
http://www.decra.co.uk/

Emory Knoll Farms
Supplier of green roof plants. Includes FAQ, research, projects, and links.
http://www.greenroofplants.com/

GreenGrid
GreenGrid® offers distinct advantages over other green roofs. With GreenGrid® you get all the benefits of a green roof system, plus the added advantages of flexible design and modular features easily tailored to your needs.
http://www.greengridroofs.com/

Green Roof Blocks
Offers self contained, portable units for completed roofs or to ballast single ply roofing systems.
http://www.greenroofblocks.com