Earth Pledge Green Roofs Initiative
Supporting the creation of green roofs upon New York City's flat rooftops. Includes rationale, research, projects, workshops, and resources.
http://www.earthpledge.org/GreenRoof.html

Caro Systems
Manufacture a high density polyethylene injection paving slab support system for laying paving on roofs, paved balconies and terraces. Includes downloadable product brochures.
http://www.carosystems.co.uk/

Hopleys Open Web Steel Joists
Hopleys Open Web Steel Joists® are a range of lightweight, fully steel joists which can be used in a variety of applications including sub-floors, first floors, roofs, sheds, lean-to’s, carports and more. Made from galvanised steel they wont rust, shrink, warp or twist and come complete with pre-punched, fully engineered brackets to make installation easy from the installation professional to the home handyman.
http://www.hopleys.com.au/

Historic Slate Roofs
The repair, replacement, and maintenance of historic slate roofs by Jeffrey S.Levine. Includes a history of slate use, further reading and repair and replacement guideline .
http://www.neslate.com/Levine.html

The New England Slate Company
Vermont Company supplying slate roofing for the repair, restoration and construction of a natural slate roof.
http://www.neslate.com/

Proof Industries
Preassembled Bay Window Roofs & Bow Window Roofs... - The Proof is in the Roof
http://www.proofroof.com/

ProfileVent
Ridge vent for commercial and residential metal roofs.
http://www.profilevent.com

GreenProducts.net
The biobased revolution has dramatically affected commercial, industrial and government-funded businesses. Biobased products come from agricultural materials like corn, and they are providing environmentally minded individuals with effective alternatives to petroleum-derived products. In fact, the term biobased may soon be as common as
http://www.greenproducts.net/

Litec Srl
Manufacturer of aluminium truss, roofs, and towers. A Gruppo Manfrotto Company.
http://www.litectruss.com/

LIDC: Green Roofs
Includes design plans, specifications, costs, and maintenance.
http://www.lid-stormwater.net/greenroofs/greenroofs_home.htm