Methane Mitigation Design
Based on the results of a methane test, the Los Angeles Department of building and Safety will require a Methane Mitigation Design. This design must be prepared by a licensed engineer and will consist of a Passive or Active System.
A Passive System is comprised of an Impervious Membrane below the foundation of a building along with a subslab vent system.
An active system is comprised of the passive system components, along with mechanical fans, methane detectors and alarms.