make-fire

name	make-fire
description	Start, maintain fire with friction, spark, solar methods. Cover site selection, material grading (tinder/kindling/fuel), fire lay construction (teepee, log cabin, platform), ignition techniques (ferro rod, flint & steel, bow drill), flame nurturing, Leave No Trace extinguish. Use when need warmth, light, or signal in wilderness, when boil water for purification, when cook foraged food, or in emergency survival — need heat or morale support.
license	MIT
allowed-tools	Read
metadata	{"author":"Philipp Thoss","version":"1.0","domain":"bushcraft","complexity":"intermediate","language":"natural","tags":"bushcraft, fire, survival, wilderness, primitive-skills","locale":"caveman","source_locale":"en","source_commit":"1861e6a6","translator":"Julius Brussee homage — caveman","translation_date":"2026-04-17"}

Make Fire

Start, maintain fire in wilderness. Use natural and carried materials.

When Use

• Need warmth, light, or signal in wilderness
• Need boil water for purification (see purify-water)
• Need cook foraged or hunted food (see forage-plants)
• Emergency survival — need heat or morale

Inputs

• Required: Ignition source (ferro rod, flint & steel, lighter, bow drill kit, magnifying lens)
• Required: Dry tinder material (natural or carried)
• Optional: Fire location constraints (wind direction, ground type, overhead cover)
• Optional: Purpose of fire (warmth, cooking, signaling, water purification)

Steps

Step 1: Select and Prepare Site

Pick location safe, functional, low environmental impact.

Site Selection Criteria:
┌─────────────────────┬────────────────────────────────────┐
│ Factor              │ Requirement                        │
├─────────────────────┼────────────────────────────────────┤
│ Wind                │ Sheltered or with a windbreak      │
│ Ground              │ Mineral soil, rock, or sand        │
│ Overhead clearance  │ No branches within 3 m / 10 ft    │
│ Distance from water │ At least 5 m / 15 ft from streams │
│ Distance from camp  │ Close enough for use, far enough   │
│                     │ to avoid spark hazards to gear     │
│ Drainage            │ Slight slope or flat; avoid hollows│
│                     │ where rain pools                   │
└─────────────────────┴────────────────────────────────────┘

Clear circle roughly 1 m / 3 ft wide down to mineral soil. Snow or wet ground? Build platform from green logs or flat stones.

Got: Cleared, level fire site. No flammable debris in circle. Adequate overhead clearance. Wind protection.

If fail: No suitable ground? Build raised platform from 4-6 green (live) wrist-thick logs laid side by side. Wind too strong? Build windbreak from stacked logs, rocks, or tarp angled at 45 degrees.

Step 2: Gather and Grade Materials

Collect materials in three categories. Grade each by dryness and size.

Material Grading:
┌──────────┬──────────────────┬──────────────┬───────────────────────────┐
│ Category │ Diameter         │ Examples     │ Quantity needed           │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Tinder   │ Hair-thin fibers │ Birch bark,  │ Two fist-sized bundles    │
│          │                  │ dried grass, │                           │
│          │                  │ cedar bark,  │                           │
│          │                  │ fatwood      │                           │
│          │                  │ shavings,    │                           │
│          │                  │ cattail fluff│                           │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Kindling │ Pencil-thin to   │ Dead twigs,  │ Two armfuls, sorted by   │
│          │ finger-thick     │ split sticks │ thickness                │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Fuel     │ Wrist-thick to   │ Dead standing│ Enough for intended burn │
│          │ arm-thick        │ wood, split  │ time (1 armload ≈ 1 hr)  │
│          │                  │ logs         │                           │
└──────────┴──────────────────┴──────────────┴───────────────────────────┘

Dryness Test:
- Snap test: dry wood snaps cleanly; damp wood bends
- Sound test: dry wood clicks when struck together; damp wood thuds
- Source priority: dead standing > dead leaning > dead on dry ground > dead on wet ground

Got: Three sorted piles within arm's reach of fire site. Tinder bone-dry, finely processed. Kindling snaps clean.

If fail: All tinder damp? Process inner bark (cedar, birch, poplar) — scrape with knife edge to make fine fibers. Fatwood (resinous heartwood from dead conifers) lights even wet. Last resort: carried fire starters (cotton balls with petroleum jelly, wax-dipped cardboard).

Step 3: Construct Fire Lay

Pick fire lay based on purpose and conditions.

Fire Lay Decision Table:
┌──────────────┬──────────────────────┬──────────────────────────┐
│ Fire Lay     │ Best for             │ Construction             │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Teepee       │ Quick start, boiling │ Lean kindling against    │
│              │ water, signaling     │ a central tinder bundle  │
│              │                      │ in a cone shape          │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Log cabin    │ Sustained heat,      │ Stack pairs of sticks in │
│              │ cooking, drying      │ alternating layers like  │
│              │                      │ a cabin; tinder in center│
├──────────────┼──────────────────────┼──────────────────────────┤
│ Lean-to      │ Windy conditions     │ Push a green stick into  │
│              │                      │ ground at 30°; lean      │
│              │                      │ kindling against it with │
│              │                      │ tinder underneath        │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Platform     │ Snow/wet ground      │ Lay green logs side by   │
│              │                      │ side as a base; build    │
│              │                      │ teepee or log cabin on   │
│              │                      │ top                      │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Star/Radial  │ Long burns with      │ Lay 4-5 logs radiating   │
│              │ minimal fuel         │ from center like spokes; │
│              │                      │ push inward as they burn │
└──────────────┴──────────────────────┴──────────────────────────┘

Leave gaps for airflow. Fire needs oxygen — pack materials loose, not tight.

Got: Stable structure. Tinder reachable for ignition. Airflow gaps adequate. Kindling arranged so flames climb from tinder to kindling to fuel.

If fail: Structure collapse? Drive support stick into ground as central post. Airflow poor (fire smokes but won't flame)? Open gaps between materials. Wind-facing side needs opening at base.

Step 4: Ignite Tinder

Pick ignition method based on tools.

Ignition Methods (ranked by reliability):
┌───────────────┬────────────────────────────────────────────────┐
│ Method        │ Technique                                      │
├───────────────┼────────────────────────────────────────────────┤
│ Lighter/match │ Apply flame directly to tinder for 5-10 sec   │
├───────────────┼────────────────────────────────────────────────┤
│ Ferro rod     │ Hold rod against tinder; scrape striker down   │
│               │ rod at 45° with firm, fast strokes; direct     │
│               │ sparks into center of tinder bundle            │
├───────────────┼────────────────────────────────────────────────┤
│ Flint & steel │ Strike steel against flint edge to cast sparks │
│               │ onto char cloth laid on tinder                 │
├───────────────┼────────────────────────────────────────────────┤
│ Bow drill     │ Carve fireboard notch; place tinder below;     │
│               │ spin spindle with bow using steady, full-length│
│               │ strokes until coal forms in notch              │
├───────────────┼────────────────────────────────────────────────┤
│ Solar (lens)  │ Focus sunlight through lens onto dark tinder;  │
│               │ hold steady until smoke appears; gently blow   │
└───────────────┴────────────────────────────────────────────────┘

Got: Tinder glows (ember) or small flame within 30 seconds of spark/flame contact.

If fail: Sparks land but tinder won't catch? Tinder too damp or too coarse. Process finer (scrape, shred, fluff). Ferro rod? Scrape some magnesium shavings onto tinder first as accelerant. Bow drill? Spindle and fireboard must be same dry softwood (willow, cedar, poplar). Notch must reach center of spindle depression.

Step 5: Nurture Flame

Tinder catches. Transition from ember to flame careful.

1. Got ember (bow drill, flint & steel)? Fold tinder bundle around ember. Blow gentle with steady, increasing breaths until flame appears
2. Place flaming tinder bundle into prepared fire lay
3. Shield from wind with body or windbreak
4. Add thinnest kindling first — individual pencil-thin sticks placed where flame touches them
5. Wait for each addition to catch before adding more

Got: Flames climb from tinder through smallest kindling within 1-2 minutes. Crackling sounds = combustion self-sustaining.

If fail: Flame dies at kindling stage? Kindling too thick or too damp. Split kindling thinner with knife. Use only driest, thinnest pieces. Flame suffocates? Fire lay too tight — gently lift material to improve airflow. Never blow so hard that embers scatter.

Step 6: Build Up to Fuel Wood

Increase material size progressively.

1. Kindling burning steady (2-3 minutes of sustained flame)? Add finger-thick sticks
2. Let those catch fully before add wrist-thick wood
3. Arrange fuel to maintain airflow — lean pieces against each other or cross-stack
4. For cooking: let fire burn down to bed of coals (20-30 minutes) before placing pot or grill

Fuel Progression:
  Tinder → Pencil-thin → Finger-thick → Wrist-thick → Arm-thick
  (each stage must be established before adding the next)

Got: Stable, self-sustaining fire. Consistent heat. Maintained by adding fuel every 15-30 minutes.

If fail: Fire keeps dying when add larger wood? Jumping sizes too fast. Go back one size smaller. Build larger bed of coals before graduate up. Wood hisses and steams? Too wet. Split it — expose dry inner wood. Or prop pieces near (not on) fire to dry before adding.

Step 7: Extinguish and Leave No Trace

Extinguishing Protocol:
1. Stop adding fuel 30-60 min before you need the fire out
2. Let wood burn down to ash
3. Spread coals and ash with a stick
4. Douse with water (pour, stir, pour again)
5. Feel with the back of your hand 10 cm / 4 in above the ashes
6. If any warmth is felt, repeat douse-stir-douse
7. When cold to touch, scatter the ash over a wide area
8. Replace any ground cover or duff that was moved
9. "Could someone walk by and not know a fire was here?"

Got: Fire site cold to touch. No visible coals. Area looks undisturbed.

If fail: No water? Smother with mineral soil (not organic duff — can smolder). Stir and check repeatedly. Never leave fire site until cold. Coals buried in deep ash? Scrape ash aside. Douse exposed coals.

Checks

• Fire site cleared to mineral soil or platform built
• Materials gathered in three graded categories before ignition
• Fire lay structure allowed adequate airflow
• Tinder ignited and transitioned to kindling without dying
• Fire reached self-sustaining fuel stage
• Fire fully extinguished — cold to touch, no visible embers
• Site left in Leave No Trace condition

Pitfalls

• Damp tinder: Most common failure. Process tinder finer than seems necessary. Source from dead standing material
• Smother with fuel: Too much wood too fast cuts off oxygen. Build up gradual
• Ignore wind: Wind helps or kills fire. Use it for airflow. Shield tinder during ignition
• Poor material sorting: Searching for kindling while tinder burns wastes critical time. Gather and sort everything before striking spark
• Wet ground conduction: Dry wood on wet ground loses heat. Use platform in damp conditions
• Incomplete extinguishing: Buried coals reignite hours later. Always verify cold to touch

See Also

• purify-water — boil water needs sustained fire. Boil method depends on this skill
• forage-plants — many plants provide tinder (birch bark, cattail fluff, dried grasses). Some need cooking
• paper-making — handcraft paper from plant fibres. Shares fibre prep and pulping techniques with tinder prep