I have been pouring over the SCS website for instructions on how to calculate the % of finished floor that is FSC for IEQ 4.3.

Is it as simple as taking total newly installed flooring with a FSC (excludes tile and non-FSC material) and dividing by total flooring SQFT of the building, OR dividing by total SQFT of our current scope of new installation only? I don't want to over complicate, but also want to make sure I calculate correctly.

EX: 2500 sf of newly installed FSC material / 5000 sf of total building flooring (5000 includes all existing-to-remain flooring, tile and non-FSC flooring)
OR
EX: 2500 of newly installed FSC material / 3000 sf of newly installed flooring material (if 500 sf was not FSC certified in job scope)

OR am I totally off. Sorry. I am self-educating as projects come, so I appreciate any help and patience.