Our company is a supplier of curtain wall systems to the glazing subcontractor. We produce shop drawings and engineering services, purchase aluminum extrusions from an extruding company and fabricate the curtain wall product and deliver to the jobsite.

Historically, when calculating the material costs for MRc4 for our LEED submittal to the GC, we declared "our cost" (no engineering, factory labor, overhead, etc) of the aluminum extrusions from our vendor and supplied their support documentation on % recycled content.

On a recent project, it was brought to our attention that this does not meet the definition of material costs as "includes all expenses to deliver the material to the project site, including taxes and delivery costs incurred by the contractor". This implies that our material cost should be our total contract value since we own the whole curtain wall package including delivery to the jobsite (no field installation). However, on the next project the GC rejected our LEED submittal when we declared the material costs as our entire contract value.

Any advice on what we should declare as our material costs when calculating % recycled content for MRc4?

Thanks.