Steel is the most recycled material in the world.
Commercial Door Manufacturing uses steel with 100% recycled material. Click here to read Metalwest letter. Use of hollow metal doors and frames can be an important part of your LEED certification process.
The most common credit applications are:
LEED 2009 for New Construction
Materials & Resources
MR Prerequisite
1: Storage and Collection of Recyclables
MR Credit
1.1: Building Reuse – Maintain Existing Walls, Floors and Roof
MR Credit
1.2: Building Reuse – Maintain Interior Nonstructural Elements
MR Credit
2: Construction Waste Management
MR Credit
4: Recycled Content
MR Credit
5: Regional Materials
Indoor Environmental Quality
IEQ Prerequisite1: Minimum Indoor Air Quality Performance
IEQ Credit 3.1: Construction Indoor Air Quality Management Plan – During
Construction
IEQ 3.2: Construction Indoor Air Quality Management Plan – Before
Occupancy
IEQ Credit 4.1: Low-Emitting Materials – Adhesives and Sealants
IEQ Credit 4.2: Low-Emitting Materials – Paints and Coatings
LEED 2009 for Core and Shell Development
Materials & Resources
MR Prerequisite 1: Storage and Collection of Recyclables
MR Credit 1: Building Reuse – Maintain Existing Walls, Floors and Roof
MR Credit 2: Construction Waste Management
MR Credit 3: Materials Reuse
MR Credit 4: Recycled Content
MR Credit 5: Regional Materials
Indoor Environmental Quality
IEQ Prerequisite1: Minimum Indoor Air Quality Performance
IEQ Credit 3: Construction Indoor Air Quality Management Plan – During
Construction
IEQ Credit 4.1: Low-Emitting Materials – Adhesives and Sealants
IEQ Credit 4.2: Low-Emitting Materials – Paints and Coatings
LEED 2009 for Schools
Materials & Resources
MR Prerequisite 1: Storage and Collection of Recyclables
MR Credit 1.1: Building Reuse – Maintain Existing Walls, Floors and Roof
MR Credit 1.2: Building Reuse – Maintain Interior Nonstructural Elements
MR Credit 2: Construction Waste Management
MR Credit 4: Recycled Content
MR Credit 5: Regional Materials
Indoor Environmental Quality
IEQ Prerequisite1: Minimum Indoor Air Quality Performance
IEQ Credit 3.1: Construction Indoor Air Quality Management Plan – During
Construction
IEQ 3.2: Construction Indoor Air Quality Management Plan – Before
Occupancy
IEQ Credit 4: Low-Emitting Materials
LEED 2009 for Existing Buildings
Materials & Resources
MR Prerequisite 2: Solid Waste Management Policy
MR Credit 3: Sustainable Purchasing – Facility Alterations and Additions
MR Credit 9: Solid Waste Management – Facility Alterations and Additions
Indoor Environmental Quality
IEQ Prerequisite1: Minimum Indoor Air Quality Performance
IEQ Credit 1.1: Indoor Air Quality Best Management Practices – Indoor Air
Quality Management Program
IEQ 1.5: Indoor Air Quality Best Management Practices – Indoor Air
Quality Management for Facility Alterations and Additions

For additional information, visit these important web sites:
US Green Building Council
LEED 2009 Rating System
Steel Recycling Institute
American Institute of Steel Construction