Structure Hardening and Defensible Space
Structure Hardening
Code requirements for construction are different for structures in the Low Fire Intensity areas and those in the Moderate and High Fire Intensity areas. Construction within the Low Fire Intensity areas must follow the "Class 1 Structure Hardening" requirements, and construction within the Moderate and High Fire Intensity areas must follow "Class 2 Structure Hardening" requirements. Class 2 requirements are more stringent and include all Class 1 provisions.
Class 1:
- Roofing
- Gutters & Downspouts
- Vents
Class 2:
- All Class 1 Requirements
- Exterior Walls
- Eaves
- Underfloor Enclosures
- Appendages & Projections
- Windows & Doors
- Decking
- Detached Accessory Structures
For more detailed information on these requirements please refer to this Structure Hardening Summary.
Defensible Space - Site Management
The code defines three ignition zones around a structure with specific mitigation requirements.
Class 1:
- Signage & Addressing
- Retaining walls
- Fencing
- Structure Ignition Zone 1 (0-5’ from a structure) requirements, which emphasize noncombustible materials, removal of most plantings, and specific tree pruning/planting rules.
Class 2:
- All Class 1 Requirements
- Structure Ignition Zone 2 (5-30’ from a structure) requirements, which aim to reduce fire intensity by managing fuel loads, tree spacing, and shrub separation.
- Structure Ignition Zone 3 (30-100’ from a structure) requirements, which focus on keeping fire on the ground through tree spacing.
For more detailed information on these requirements please refer to this Defensible Space - Site Management Requirements Summary.
Administering and Enforcing the Code in Broomfield
Once the WUI code is adopted by Broomfield, the local "Code Official", in this case, the Broomfield Chief Building Official, is responsible for interpreting and enforcing the code as part of the building permit review and inspection process.
Will Broomfield adopt the WRCB map?
The State allows local jurisdictions to develop a map specific for their jurisdiction based on more accurate field data or “ground-truthing”. The WRCB will need to review and approve the local map before it can be utilized for Broomfield for administration of the code.
Broomfield will be conducting a local mapping pilot project this fall, including on-the-ground field verification performed by an experienced consultant. The pilot area is located between 144th Ave. and 152nd Ave., and between Zuni Street and Lowell Blvd.
