  CMS experiment constructed the fourth Resistive Plate Chamber (RPC) trigger
station composed of 144 RPCs to enhance the high momentum muon trigger
efficiency at both endcap regions. All new CMS endcap RPC gaps are produced in
accordance with QA and QC at the Korea Detector Laboratory (KODEL) in Korea.
All qualified gaps have been delivered to three assembly sites: CERN in
Switzerland, BARC in India, and Ghent University in Belgium for the RPC
detector assembly. In this paper, we present the detailed procedures used in
the production of RPC gaps adopted for the CMS upgrade.
