Fiberglass Duct Wrap Insulation is Greenguard Gold

Hi Trevor, While duct wrap insulation does function as thermal (and acoustic) insulation, it's really part of the mechanical system, not part of the structure--so there is no need to document it for this credit. 

Hi Trevor, As I understand, if you use duct insulation for MRc3 Option 1 (product based), you don’t have to include it in other MR credits. It would be required, if you used it for Option 2. Page 219 of the Ref Guide: If optional products or materials are included in cost-based credit calculations, such as Option 2 under each Building Product Disclosure and Optimization credits, they must be included consistently across all cost-based credit calculations. Additionally, if optional products and materials are included in product based calculations, such as Option 1 under each Building Product Disclosure and Optimization credits, they are not required to be included in cost-based credit calculations. Hope this helps:) Though, I haven’t work on a v4 before and would appreciate if someone confirmed.