Tecnobosque Wildfire Knowledge Graph · Built Environment
Reference Concept · v1.0Definition → relationship → calculation → evidence context
The horizontal spacing between structures or major combustible exposures considered when evaluating structure-to-structure fire spread.
SSD
What is structure separation distance?
The horizontal spacing between structures or major combustible exposures considered when evaluating structure-to-structure fire spread.
For Tecnobosque, structure separation distance is useful only when its source, spatial context and observation or modelling window are stated. The same label can otherwise hide important differences between field observations, remote sensing, forecasts and reconstructed incident evidence.
Why it matters
Structure Separation Distance is useful because it separates one specific part of wildfire behaviour, exposure, operations or evidence from nearby concepts that can otherwise be mixed together.
The horizontal spacing between structures or major combustible exposures considered when evaluating structure-to-structure fire spread.
What changes structure separation distance?
Field observation, remote sensing, model output and retrospective reconstruction can produce values with different assumptions and uncertainty.
A point, parcel, fire-front segment, incident perimeter and regional product can represent very different physical scales.
Wildfire conditions evolve rapidly, so timestamps and averaging periods are part of the meaning of the value.
How to interpret structure separation distance
- Identify exactly what object or process the value describes.
- Check units, spatial scale, timestamp and source before comparing values.
- Separate direct observations from modelled or reconstructed estimates.
- Preserve uncertainty and later revisions instead of overwriting earlier evidence.
What structure separation distance cannot tell you by itself
- Structure Separation Distance is not a complete description of wildfire hazard or risk by itself.
- Values from different methods or scales may not be directly comparable.
- A technically precise number can still be misleading when context or uncertainty is omitted.
Structure Separation Distance FAQ
Is structure separation distance one fixed value for an entire wildfire?
Usually not. Wildfire conditions vary in space and time, so the value should be attached to a defined place, object and observation period.
Can structure separation distance be used alone for an emergency decision?
No. Operational decisions require current local authority information and a wider set of conditions than a single technical concept can provide.
Structure separation distance: not a universal safe threshold
Structure separation distance is the physical spacing between two buildings or other structures, measured using a stated convention. It affects potential radiant exposure and building-to-building fire spread, but spacing is only one variable among many.
Measurement matters: centre-to-centre spacing, wall-to-wall spacing and the clearance between combustible features are not equivalent. Two houses may have 12 m between main walls while an attached deck, shed, vehicle or fence reduces the shortest potential burning-to-building distance dramatically.
Heat exposure depends on the size and orientation of burning surfaces, wind, intervening materials, openings and duration of burning. A numerical spacing taken from one construction standard or research experiment cannot be transferred to another situation without matching its assumptions.
For neighbourhood resilience, inspect not only private vegetation but connected outbuildings, garages, carports and combustible storage. Community-scale exposure is different from a single home’s defensible-space radius.
See Structure-to-structure Spread and Combustible Attachment.