We are a General Contractor and we are wondering if we, ourselves, would be required to get COC Certified when attempting to achieve MRc7? We purchase FSC plywood, dimensional lumber, etc. that we use for backing, parapets, furring, etc.. I am guessing from what I've read that if we are modifying FSC material that we too would need our COC certification. Does anyone know if this would be correct?

As well, since we are purchasing FSC material (for backing, furring, etc.) from lumber suppliers that our suppliers too would need their COC certification, correct? Places such as McKillican or Mission Building Supplies in Canada. Can anyone confirm if this would be correct as well?