Page 242 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Materials and Resour ces 215

In LEED 2009, one point is earned for MRc3 if the following is true:

100(MATL$ /MATL$ ) ≥ 5 (5.3.1)
SAL T
An additional point is earned for MRc3 if the following is true:
100(MATL$ /MATL$ ) ≥ 10 (5.3.2)
SAL T

Special Circumstances and Exemplary Performance (LEED 2009 MRc3)
An EP point can be earned in the MR subcategory for increasing the performance by
50 percent more than required for the second point, that is, for using salvaged or reused
items which are valued at 15 percent or more of the applicable project material costs.
Therefore, an EP point can be earned for material reuse if the following is true:

100(MATL$ /MATL$ ) ≥ 15 (5.3.3)
SAL T
Since it is usually not certain whether salvaged materials can be appropriately refurbished or
reused for many applications in the design phase, this subcategory is listed as a construction
phase submittal. The contractor should keep records of salvaging activities and costs.

5.4 MR Credit Subcategory 4: Recycled Content
The intent of this credit subcategory is to encourage the use of items made from recycled
materials to lessen the resource and environmental impacts of making many products
from raw materials and to lessen the solid waste load in the country. In LEED 2.2,
MRc4.1 is worth one point for 10 percent, and MRc4.2 is worth one point for achieving
20 percent in addition to the point for MRc4.1. LEED 2009 has consolidated both into
the single MRc4 subcategory with similar varying points depending on compliance,
one point for 10 percent and two points for 20 percent.

MR Credit 4: Recycled Content (postconsumer + ½ preconsumer)

USGBC Rating System MR Credit 4
LEED-NC 2.2 lists the Intent, Requirements, and Potential Technologies and Strategies
for this credit as follows, with notations for LEED 2009 changes included:
Intent
Increase demand for building products that incorporate recycled content materials, thereby
reducing impacts resulting from extraction and processing of virgin materials.
Requirements
Use materials with recycled content such that the sum of post-consumer recycled content
plus one-half of the pre-consumer content constitutes at least 10% (for one point and 20%
for two points in LEED 2009) (based on cost) of the total value of the materials in the project.
The recycled content value of a material assembly shall be determined by weight. The
recycled fraction of the assembly is then multiplied by the cost of assembly to determine the
recycled content value. Mechanical, electrical and plumbing components and specialty
items such as elevators shall not be included in this calculation. Only include materials
permanently installed in the project. Furniture may be included, providing it is included
consistently in MR Credits 3–7. Recycled content shall be defined in accordance with the