LEED Program
RMCI specification aggregates qualify for critical pre-consumer and post-consumer points in the Leadership in Energy and Environmental Design (LEED) program established by the United State Green Building Council (USGBC).
Recycled Content: (Materials and Resources LEED Credit 4)
The requirements of this credit are for using materials with recycled content. One point is awarded if the sum of the post consumer recycled content plus one-half of the pre-consumer recycled content constitutes at least 10% (based on cost) of the total value of the materials in the project. The value of the recycled content of a material is the weight of the recycled content in the item divided by the weight of all materials in that item, and then multiplied by the total const of the item. Supplementary cementitious materials, such as fly ash, silica fume, and slag cement are considered pre-consumer. LEED-NC v2.2 allows the recycled content of concrete to be based on the recycled content of the cementitious materials. An example calculation is provided in the LEED-NC v2.2 Reference Guide. Furthermore, using recycled concrete or slag as aggregate instead of extracted aggregates would qualify as post-consumer. Although most reinforcing bars are manufactured from recycled steel, in LEED, reinforcing is not considered part of concrete. Reinforcing material should be considered as a separate item. This credit is worth 1 point for the quantities quoted above and 2 points in the quantities are doubled to 20%.
Regional Materials (Materials and Resources LEED Credit 5)
This credit supports the use of indigenous (local) materials and reduced transportation distances. The requirements of this credit state: “Use building materials or products that have been extracted, harvested or recovered, as well as manufactured, within 500 miles (800 km) of the project site for a minimum of 10% (based on cost) of the total materials value.” Concrete will qualify if ready-mix and precast plants are within 800 km (500 miles) of a job site, and if the materials to make the concrete were extracted within 800 km (500 miles). Aggregates (sand and gravel) are usually extracted within this distance, and cement and supplementary cementitious materials are usually manufactured within this distance. Calculations can also include concrete either manufactured or extracted locally. This credit is worth 1 point for the quantities above and 2 points for double the amount, or 20%.
Recycled Content: (Materials and Resources LEED Credit 4)
The requirements of this credit are for using materials with recycled content. One point is awarded if the sum of the post consumer recycled content plus one-half of the pre-consumer recycled content constitutes at least 10% (based on cost) of the total value of the materials in the project. The value of the recycled content of a material is the weight of the recycled content in the item divided by the weight of all materials in that item, and then multiplied by the total const of the item. Supplementary cementitious materials, such as fly ash, silica fume, and slag cement are considered pre-consumer. LEED-NC v2.2 allows the recycled content of concrete to be based on the recycled content of the cementitious materials. An example calculation is provided in the LEED-NC v2.2 Reference Guide. Furthermore, using recycled concrete or slag as aggregate instead of extracted aggregates would qualify as post-consumer. Although most reinforcing bars are manufactured from recycled steel, in LEED, reinforcing is not considered part of concrete. Reinforcing material should be considered as a separate item. This credit is worth 1 point for the quantities quoted above and 2 points in the quantities are doubled to 20%.
Regional Materials (Materials and Resources LEED Credit 5)
This credit supports the use of indigenous (local) materials and reduced transportation distances. The requirements of this credit state: “Use building materials or products that have been extracted, harvested or recovered, as well as manufactured, within 500 miles (800 km) of the project site for a minimum of 10% (based on cost) of the total materials value.” Concrete will qualify if ready-mix and precast plants are within 800 km (500 miles) of a job site, and if the materials to make the concrete were extracted within 800 km (500 miles). Aggregates (sand and gravel) are usually extracted within this distance, and cement and supplementary cementitious materials are usually manufactured within this distance. Calculations can also include concrete either manufactured or extracted locally. This credit is worth 1 point for the quantities above and 2 points for double the amount, or 20%.
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