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https://www.nist.gov/el/fire-research-division-73300/wildland-urban-interface-fire-73305/hazard-mitigation-methodology-16

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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 

# Why Exposure Matters, not Parcel Boundary

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Property boundaries are not barriers to fire spread.Existing parcel-centric codes offer limited or no protection to the neighboring parcel.
                  - Historically, codes have been parcel-centric and address exposures in the context of protecting a residence from the exposures originating on the same parcel.
                  - Focusing only on structures and exposures within a property boundary may threaten a neighbor’s home.
                  - The distance between secondary structures, like a storage shed, to all surrounding structures is important, including structures on a neighboring property.

### Scenario A:

Shed is located far away from the house on Lot 1 but is too close to the neighboring house across the property boundary on Lot 2. Limiting code application within property lines leaves the hazard imposed from the shed to the neighboring house unmitigated.

### Scenario B:

When the property boundary is ignored and the potential exposure is considered, the shed is located far away from both residences.

-  **‹** Fire Spread Pathways 
-  Hazard from Fuel Agglomeration **›** 

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