Sioux Chief metal hanger strap shall be used where necessary to support CTS, IPS or DWV pipe. Metal strap shall be made with galvanized or copper-plated steel and installed in accordance with national codes pertaining to hanger spacing and slope requirements. Metal hanger strap shall feature 1/4 or 3/16 in pre-drilled pilot holes in alternating pattern and strap shall be 3/4 wide.