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https://www.nist.gov/el/fire-research-division-73300/wildland-urban-interface-fire-73305/hazard-mitigation-methodology-20

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Engineering LaboratoryFire Research Division

## Wildland-Urban Interface Fire Group

-  HAZARD MITIGATION METHODOLOGY (HMM)  Expand or Collapse    -  Why Implement HMM in your Community?  Expand or Collapse      -  Exposures During WUI Fires 
    -  HMM vs Traditional Hazard Mitigation 
    -  WUI Definitions 
    -  Structure Survivability in the WUI 
    -  Community Survivability in the WUI 
    -  Paths forward: Implementing HMM 
    -  Communities already implementing HMM 
  -  How Fire Spreads in the WUI  Expand or Collapse      -  How do Structures Survive WUI Fires? 
    -  Fire Spread Pathways 
    -  Why Exposure Matters, not Parcel Boundary 
    -  Hazard from Fuel Agglomeration 
    -  Community-scale WUI Fire Hazards 
  -  Community-Wide Structure- and Parcel-Level Hardening Actions  Expand or Collapse      -  How Density Impacts Community 
    -  Workflow for HMM Hardening Actions 
    -  Structure Hardening for Embers 
    -  Parcel Hardening for Fire: the Three R’s 
    -  Surrounding Parcel Hazard Mitigation 
    -  Primary Parcel Hazard Mitigation 
    -  Structure Hardening for Fire 
    -  Communities Hardening Actions 
  -  Hardening Actions: Construction Guidance 
  -  Contacts 

# Workflow for HMM Hardening Actions

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#### The basic approach to implement HMM is to:

                  - Fully protect each structure from embers ( Table A ).
                  - Remove fuel where possible, reduce fuel that can not be removed, and relocate fuel away from structures and fences, etc.
                  - Consider the spacing between fuels on the property being mitigated ( Table C ) and neighboring properties ( Table B ).
                  - Consult Table D for mitigating actions if spacing is not adequate to reduce exposure.

**Vulnerabilities to embers and fire must be addressed independently.**

The expanded workflow cycle is illustrated in the flowchart below, highlighting independent mitigation of embers and fire exposure vulnerabilities.

The expanded workflow cycle is illustrated in this figure, highlighting independent mitigation of embers and fire exposure vulnerabilities.

-  **‹** How Density Impacts Community 
-  Structure Hardening for Embers **›** 

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