USGBC members can register to ballot on the latest draft version of LEED v.4 April 1-30. One of many changes are those regarding building materials for LEED credits, including product disclosures and optimization (Environmental Product Declarations), supply chain/source materials, and material ingredients disclosures.
Substantially reworked, the Materials & Resources section of LEED v4 is different from LEED 2009 in that it applies lifecycle thinking at the whole-building and product level. Proposed credits reward projects for reusing as much material as possible and optimizing design to use less material overall. LEED 2009 credits were based on single attributes of materials, such as recycled content. This approach only tells part of the story; a product could have higher than average performance on that one attribute but far lower than average performance on others. The LEED v4 approach paints a more complete picture of materials and products, enabling project teams to make more informed decisions that will have greater overall benefit for the environmental, human health, and communities.