Processing Bush Wood for Firewood (Field Guide)
Process bush wood by first identifying sound stems, then bucking them safely with a well-matched, sharp chainsaw. Split rounds to suit your stove, stack them off the ground with open sides, and verify dryness on a freshly split face with a moisture meter. Aim for less than 20% moisture before burning; species, round size, climate, and stacking all affect drying time.
A neat woodpile can look ready weeks before the wood inside is dry. For winter heat, the useful measure is not how long a log has sat, but its moisture content and the amount of usable wood you can store and burn. Wet wood gives less heat to the room and can increase smoke and creosote buildup.
Bush wood varies widely in species, stem size, condition, and stored tension. I treat each stem as a separate job: identify what it is, check how it is supported, then choose the cut and split size. That careful start saves fuel, reduces wasted effort, and helps prevent a routine firewood day from turning dangerous.
Equipment Setup and Safety Preparation
This stage is about matching the saw and cutting area to the work before the chain starts moving. Small stems may be manageable with a sound 35–50 cc saw and a 12–16-inch bar, but the saw manual, bar and chain match, wood size, and your skill decide what is suitable. There is no universal displacement-to-bar rule.
Choose and inspect the saw
A chainsaw’s pitch is the spacing of its chain drive links, and gauge is the thickness of the part that fits into the bar groove. Drive-link count and bar mount matter too. All four must match the saw and bar. A 3/8-inch low-profile chain with .050-inch gauge is one common light-duty setup, not a default replacement size.
Before work, inspect the chain brake, chain catcher, throttle lockout, bar, and chain tension. Use tackified chainsaw bar oil and check that oil reaches the chain as the manual directs. Use the maker’s specified fuel and fresh, correctly labeled mix. A 50:1 mix is common for two-stroke saws, but it is not universal and does not apply to every engine.
Wear a helmet with eye and face protection, hearing protection, chainsaw-rated leg protection, gloves, and boots with good grip. Clear the ground around the cut, plan where you can step away, and keep people outside the work area. Follow applicable ANSI Z133 and OSHA rules for your work setting.
Check footing, stems, and hazards
Look overhead and around the stem for hung-up limbs, unstable branches, and spring poles. A spring pole is a bent limb or stem holding stored force; it can snap or move when cut. Check whether the wood is under compression or tension, and whether it can roll or pinch the bar.
One serious risk is a barber chair: a loaded upright stem can split lengthwise and throw its upper section toward the operator. Do not make one deep cut through a loaded upright stem. If you cannot predict how it will move, stop and get help from someone qualified to assess it. Never cut above shoulder height, and do not work with an unclear escape route or unstable footing.
Field Cutting, Bucking, and Firewood Handling
Bucking means cutting a stem or log into shorter lengths. The goal is to make stove-ready pieces without trapping the bar, letting wood roll, or standing in the path of a shifting stem. Set a length that fits your stove, then support each piece so the kerf stays open and the cut remains controlled.
Start the saw and make controlled cuts
Start on stable ground using the saw’s procedure. Engage the chain brake as directed. Check that the chain stays still at idle, the brake works, and the bar receives oil. Warm the saw as the manual specifies. Keep both hands on the saw, maintain firm footing, cut below shoulder height, and avoid using the guide-bar tip.
Support each piece before cutting. A log held at both ends may sag and pinch the bar in the middle; a log supported in the center can close the cut toward its ends. These are common patterns, not a substitute for reading the actual load. If the kerf begins to close or the stem shifts, stop and reassess rather than forcing the saw.
For larger or tensioned stems, determine which side is compressed and which is stretched before choosing a cut sequence. Do not guess when the forces or direction of movement are unclear. Leave felling and hung-up trees to a qualified person when you cannot make a safe plan.
Sort rounds, split, and stack
Move cut rounds away from the cutting zone and place them on stable ground where they cannot roll. Split them to fit the firebox and to expose more surface to air. Smaller pieces usually dry faster than large rounds, but the right size depends on your stove and the species. Split knotty or irregular pieces with care; they may deflect an axe or resist a straight split.
Stack wood on a stable base, off the soil, with space for air to move through the pile. Keep the top protected from rain while leaving the sides open. Avoid stacking where falling wood could block a path or create a hazard. A sheltered, breezy location is often more useful than a fully enclosed shed with poor airflow.
| Field decision | Practical check | Why it matters |
|---|---|---|
| Saw and chain | Confirm pitch, gauge, drive-link count, and bar mount in the manual | Prevents mismatched parts and poor cutting |
| Cut length | Measure against the stove’s firebox | Avoids unusable oversize pieces |
| Round size | Split thick rounds into manageable pieces | Exposes more wood to drying air |
| Stack location | Stable base, off soil, open sides, covered top | Limits ground moisture and rain exposure |
| Ready to burn | Meter reading below 20% on a newly split face | Checks the interior, not just the surface |
Maintenance, Chain Sharpening, and Engine Tuning
A sharp, correctly tensioned chain cuts with less effort than a dull one. Maintenance means checking the chain, bar, oiling system, and saw before and after work, then following the maker’s service instructions. Do not compensate for a dull chain by pushing harder or changing engine settings.
Sharpen and inspect the cutting system
A chain that makes fine chips and cuts straight is in better shape than one that produces dust, wanders, or needs force. These are warning signs, not a substitute for inspecting the cutters. Use the file size and filing angles listed for that chain. Check tension as the manual directs; a chain that is too loose can come off, while one too tight can wear parts.
Depth gauges, also called rakers, limit how deeply each cutter bites. Oregon publishes .025 inch (0.635 mm) as a starting setting for many chains, but the correct value depends on the chain. Confirm the maker’s chart and use the matching gauge tool. Do not lower rakers indiscriminately; an overly aggressive chain can cut harshly and become harder to control.
Clear sawdust from the bar groove, oil holes, and sprocket cover, and check the cooling openings and air filter. Switch off before cleaning or adjusting. Let the saw cool before handling it, and keep fuel away from hot parts, flames, and other ignition sources.
Leave tuning to model-specific values
Idle speed and maximum no-load engine speed vary by model. Set them only to the manufacturer’s stated values with a suitable tachometer; do not tune by sound or exceed the specified maximum. The same rule applies to oil grade, oil flow, and fastener torque: use the manual rather than a generic number.
Shutdown, Storage, and Seasonal Care
Good shutdown and storage protect the saw and keep the next work session predictable. Switch the saw off before clearing debris, adjusting the chain, or moving it between work areas. Allow it to cool before cleaning or refueling, and store it according to the manufacturer’s instructions.
Clean and store the saw
After cutting, clean the air filter, bar groove, oil holes, sprocket cover, and cooling openings. Inspect the chain for damage and check tension before storage. Carry the saw with the chain brake on and the bar pointed safely away, following the manual’s directions.
Fuel storage rules depend on the saw and fuel product. Use only an approved, labeled container and follow the maker’s guidance for storage or draining. Keep fuel in a ventilated area away from heat and ignition sources. Before the next workday, repeat the safety and oil-delivery checks rather than assuming the saw is ready.
Track drying with a meter
A moisture meter estimates the water content of wood. For a useful firewood check, split a piece and press the meter pins into the newly exposed face, following the meter maker’s instructions. Test several pieces from different parts of the stack. A dry outer surface can hide a wetter center.
Use less than 20% moisture as a practical target for firewood. Drying time cannot be set by a calendar alone: it changes with species, piece size, weather, airflow, and stack design. Record the split date, species if known, and readings. Retest later, especially after wet weather or when a stack has been moved.
Field Scenarios: Make the Right Call
These scenarios show how to apply the checks to common bush-wood jobs. They are not substitutes for training or the saw manual. When the stem’s support, stored force, or movement is uncertain, stop rather than trying to solve the problem with a faster cut.
Small, straight stems
For sound, small-diameter stems on stable ground, check the saw setup, clear the work area, and cut manageable lengths. Keep each piece from rolling, then split thicker rounds and stack them with airflow. The key is to control the stem and maintain footing, not to rush through a pile.
Bent, supported, or upright stems
A bent stem, a stem held under load, or a small upright stem may move suddenly when cut. Assess compression and tension before choosing where to cut. In particular, do not make a deep, single cut through a loaded upright stem because it may barber-chair. If the likely movement is not clear, leave it to a qualified operator.
| Scenario | First move | Stop if… |
|---|---|---|
| Round on uneven ground | Stabilize it against rolling | It shifts as you set up |
| Kerf starts closing | Stop and reassess the load | You cannot release the bar safely |
| Stem is bent or loaded | Identify compression and tension | The movement is uncertain |
| Wood looks dry outside | Split and meter the center face | Readings remain at or above 20% |
Conclusion and FAQ
Processing bush wood well takes a repeatable routine: identify hazards, use a correctly matched and maintained saw, support the wood, and stack split pieces for airflow. Then verify dryness with a meter instead of guessing from color or time. These steps help you make safer cuts and burn wood that is ready to give useful heat.
How dry should firewood be before burning?
Aim for less than 20% moisture. Check the freshly split face of several pieces with a meter, following its instructions.
Where should I place moisture-meter pins?
Test the newly exposed face after splitting a piece, not only the weathered outer surface. Follow the meter maker’s instructions for pin placement.
How long does bush wood take to dry?
There is no reliable single timeline. Species, piece size, weather, airflow, and stacking conditions all affect drying, so verify with a meter.
Should I split small rounds?
Split pieces to fit your stove and improve exposure to air. Small rounds may not need splitting if they fit the firebox and dry adequately.
What chainsaw size should I use for small stems?
A sound 35–50 cc saw with a 12–16-inch bar can suit many small stems, but the manual, cutting conditions, and operator skill govern. This is not a universal rule.
Is a 50:1 fuel mix right for every chainsaw?
No. It is common for two-stroke saws, but use the ratio specified by the manufacturer. Do not use straight gasoline in a two-stroke engine.
What does it mean if the bar pinches during a cut?
The wood may be shifting or closing the kerf. Stop and reassess the support and stored forces; do not force the saw through the cut.
Why is a barber chair dangerous?
A loaded upright stem can split vertically and throw its upper section toward the operator. Avoid a deep, single cut through such a stem and stop if its movement is uncertain.
(This article was written by one of our staff writers, Samuel Vance. Visit our Meet the Team page.)
