A settlement without a fire service prevents fires from spreading by design, because a fully burning building cannot be put out with buckets. Fire passes between buildings by radiant heat, rising hot gas and windborne embers, and each is answered by a design choice: distance between buildings, fire-resistant walls, and a metal, tile or sod roof in place of thatch.
Part of Fire Prevention in Settlements
Prevention by design is the planning of spacing, materials, roofs and stoves so that one building’s fire stays one building’s fire.
Once A Building Is Fully Alight, Only Design Protects The Next One
The fire guide states the starting fact plainly: once a structural fire is fully engulfed, a community with buckets cannot extinguish it, and the only goals left are to contain the fire to that building and protect the neighbours. Everything that decides whether a fire spreads was fixed earlier, when the buildings were placed and built. That is why prevention is a design topic and not an equipment one.
The fire guide names three ways fire crosses from one building to another, and each has its own defence.
| Mechanism | What happens | Design answer |
|---|---|---|
| Radiant heat | A burning wall radiates heat that can ignite a facing wall | Distance, and non-combustible walls (Building Spacing & Fire Breaks) |
| Convection | Hot gas rises and ignites roofs and upper storeys | Non-combustible roofs and walls (Fire-Resistant Building Materials) |
| Embers | Burning fragments carried by wind land on roofs hundreds of metres away | A roof an ember cannot ignite, and clear gutters and vents (Ember Protection) |
The fire guide adds the commonest cause of a fire starting in the first place: the stove or chimney (Chimney & Stove Safety).
Worked Example: What Doubling The Gap Does
The building-spacing article calculates the heat reaching a facing wall from a burning wall 5 m long and 3 m high at 1,000 C: about 23 kW/m² at 5 m, 10 kW/m² at 8 m and 6.7 kW/m² at 10 m (Fire Breaks & Building Spacing). Going from 5 m to 10 m takes the flux from 23 to 6.7, which divides it by 23 ÷ 6.7 = 3.4. Wood ignites in the presence of a flame at about 12.5 kW/m², so 5 m is above that level and 10 m is below it. A distance that looks only twice as large changes the answer from ignition to survival.
What You Need
- A site plan showing every building, its walls and its roof
- A list of the materials of each wall and roof
- The prevailing wind direction for the fire season
- A note of every stove, forge and kiln and its chimney
Method: Review A Plan For Fire
Step 1: Measure the gaps. The fire guide’s least figures are 5 m between homes (8 m preferred), 10 m from homes to workshops (15 m preferred), 8 m between workshops that use fire, and 10 m from any building to fuel storage, all doubled for combustible walls.
Step 2: Mark the roofs. Any thatch or wood-shingle roof is a danger to every building downwind.
Step 3: Mark the sources. Forges, kilns, stoves and cooking fires, with their chimneys.
Step 4: Mark the water and the distance from each building to it (30 m is the fire guide’s limit, Water Systems for Fire Fighting).
Step 5: Fix the worst first: a thatch roof beside a forge, a woodpile against a wall, a gap that is below the figure.
Common Mistakes
- Counting on fire fighting. The settlement cannot put out a fully involved building.
- Spacing without roofs. Embers ignore the gap.
- Fixing the gaps and ignoring the chimney. Most building fires start at the stove or chimney.
- Using 5 m for timber homes. The fire guide asks for the doubled figure.
Safety
The fire is not the only thing that kills
People die in settlement fires from smoke, from carbon monoxide and from going back in. Design every building with two exits, keep exits clear and open outward, and teach everyone that the first act at a fire is to get out (Response Protocols & Training).
What’s Next
- Learn next: Building Spacing & Fire Breaks — turning the table into a layout
- Combine with: Water Systems for Fire Fighting — the second half of prevention