Please clarify if "use of salvaged, refurbished, or reused materials" for % of building (construction) would include building infrastructure components, i.e. existing in-place HVAC systems or components of a system. Would these items be applicable to MR Credit 1.3, building reuse (interior)?
Building components that are left in-place do not meet the definition of salvaged, and thus can not contribute to achieving MR Credit 3. Components that are salvaged on-site can be included in this credit calculation only in certain circumstances. Page 192 of the LEED-NC Version 2.1 Reference Guide states: "A material salvaged during a building renovation can be applied to this credit only if it can no longer serve its original function and has been reprocessed and installed for a different use. Materials that will be reinstalled to serve in their original function may be applied to MR Credit 1.3, Building Reuse. On a project site where an existing building is being demolished or deconstructed, the material that is salvaged on-site and installed in the new building can be used to comply with this credit." MR Credit 1.3 addresses "walls, flooring and ceiling systems" only. Applicable internationally.