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/

NS Irwin Ltd.
N.S. Irwin Ltd is a quality supplier of roofing and roofing accessories, flashings, corrugated metals, sheetmetal and Longrun steel roofing, cladding and roof drains
http://www.irwin.co.nz/

Frimatec-Isocab
Polyurethane insulation panels from Frimatec Isocab: clean room manufacturer, cold rooms, structural insulated panels, fire resistant panels.
http://www.frimatec-isocab.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/

Ash and Lacy Building Products Ltd.
Supply a range of structural components and specialist fabrication services to the building industry. Products include metal cladding for roofs and walls and pitched roof supporting structures .
http://www.ashandlacy.com/

Gasell Profiles Ltd
Rannila Steel Oy, Finnish manufacturer of sheet steel products for the building and construction industry. International marketing, project management, quality certified.
http://www.gasell.co.uk/

Roof Products, Inc.
Manufacture prefabricated roof curbs and other roof accessories. Products include expansion joints, equipment supports, adapters, and ice deflectors.
http://www.rpicurbs.com/

Roof Coatings Manufacturers Association
Roof Coatings Manufacturers Association (RCMA) represents manufacturers of cold-applied roof coatings and cements. RCMA’s site offers product information and the latest roof coating news.
http://www.roofcoatings.org/

Architectural Cladding Services, Inc.
Provides consulting services for curtainwalls and exterior cladding. Includes description of services, profile and contacts.
http://www.curtainwall.com/

Fibreglass Roof Decking
Roof Decking From Dura Composites Ltd
http://www.roofdecking.co.uk