Team Codefire has just released a "low effort root" for the T-Mobile, Verizon Wireless, International, AT&T and Sprint LG G4. The root method requires that you flash a pre-rooted firmware. Similarly to what some Samsung users do with Odin.
http://forum.xda-developers.com/g4/...-tmo-vzw-intl-variants-soon-root-lg-t3164765/
http://forum.xda-developers.com/g4/...-tmo-vzw-intl-variants-soon-root-lg-t3164765/