Split, store and season firewood

Plan the supply before you cut

Work out how much wood the household actually burns before buying or felling anything. Cords are a sales unit you may encounter: a full cord is a stack 4 ft high, 4 ft wide and 8 ft long (about 1.2 × 1.2 × 2.4 m). Some dealers sell face cords—4 ft high, 8 ft long and only as wide as the pieces—so convert any offer to a full-cord volume before comparing prices. For a 4 ft × 8 ft stack of 16 in pieces, the depth is 16 ÷ 48 = one-third of a full cord; multiply the stack's price by three to obtain the equivalent full-cord price. The conversion depends on actual piece length, so check the dimensions rather than relying on the sales label. A realistic first-year estimate comes from the appliance, the house and the weather, not from a neighbour's pile.

Species matter less than dryness. At comparable moisture contents, wood carries roughly similar energy per pound, though energy content varies by species; species also differ in density. Dense hardwoods such as oak, maple and hickory hold more energy per cord and give long-lasting coals, while softer woods such as pine, spruce, birch and aspen generally burn faster and suit mild-weather fires. Here, 'softer woods' describes fuel characteristics, not a botanical classification: birch and aspen are hardwoods. The best species is the one that is plentiful, easy to split and available locally—plan to burn a blend rather than chasing one premium tree.

Size the pieces to the appliance, following the manufacturer's instructions. As general guidance, cut logs to a length at least 3 in (7.5 cm) shorter than the firebox so they load and stoke easily; 14–18 in (35–45 cm) suits most wood stoves where the required clearance is maintained. Split to a range of sizes, roughly 3–6 in (7.5–15 cm) across the largest face where suitable for the appliance, so each load mixes quick-igniting small pieces with larger pieces that burn steadily.

Split the wood safely

Split along the grain rather than across it: the axe or splitter follows the natural lines and the wood opens with far less force. A wedge and maul handle most garden and orchard wood; a mechanical splitter earns its keep on large volumes, hard species or knotty logs.

Split soon after cutting. Minimise the time unsplit logs lie on the ground: mould and rot can develop, especially in damp conditions, but there is no universal two-day deadline. Work in batches—cut, split, stack—and keep wood off the ground if processing is delayed.

Treat splitting as a safety-critical task. Wear eye protection, gloves and sturdy boots, split on a stable stump or block, keep the swing area clear of people and obstacles, and never split with two people facing each other. Control the tool on every swing: a deflected axe or a slipping wedge can cause injury.

Stack for airflow, not for looks

Seasoning is evaporation from the split faces, so the stack must let air and sun reach the wood. Stack in separate rows in an open location where summer sun can warm it and breezes can carry the moisture away. Leave gaps between rows and between pieces so air moves through the pile, and keep the pieces aligned so the stack stays stable.

Keep the wood off the ground on pallets, poles or rails. This stops the bottom layer rotting, keeps ground moisture out and lets air pass under the stack. Cover the top of the pile to shed rain, but leave the sides completely open—a fully enclosed stack traps the moisture it is trying to lose. Do not store unseasoned wood tightly in a closed, unvented shed or garage; it will stay wet and can grow mould.

Time the work to the weather. Wood cut, split and stacked in late winter or early spring can be ready by autumn if it is a softer species. Extremely hard woods such as oak and maple, and large pieces, may take at least a full year to dry, and damp maritime climates slow everything down. If winter arrives before the wood reaches 20% moisture or less, leave it to season longer and obtain properly dried fuel for immediate use. Do not burn wet wood: it produces more smoke and tar, gives less useful heat, and increases deposits and fire risk in the appliance and chimney.

Judge when the wood is dry

Freshly cut wood can hold up to half its weight in water; wood that burns well is down to 15–20% moisture. Cracks, colour, sound, weight and feel are indicators of drying, not proof that wood has reached the stated threshold of 20% moisture or less. Use these signs together to assess drying progress:

• Checks or cracks in the end grain, where the ends have split open as the wood dried.
• Colour: the cut face darkens from white or cream to grey or yellow as it dries.
• Sound: two dry pieces banged together ring hollow; wet pieces sound solid and dull.
• Weight: a dry armful weighs noticeably less than a wet one.
• Feel: split a piece and check the fresh face—if it feels damp, the wood is still too wet.

When in doubt, leave the wood to season longer and use properly dried fuel for immediate needs. Do not burn a doubtful test piece to judge readiness; the decision to burn depends on reaching 20% moisture or less, not on appearance or elapsed time alone.

Move it to winter storage

Once the wood is seasoned, move it to winter storage: a dry area fully sheltered from rain and snow, close to the house but not inside it. Large quantities should not be stored indoors, where mould growth can contaminate the air with spores, though a small amount kept inside gives the wood time to warm to room temperature before burning, which helps it light.

Keep the winter stack tidy and accessible, with the oldest wood easiest to reach so it is used first. Set aside a small supply of small, well-seasoned pieces as kindling and starter wood—starting a fire with a few quick-igniting splits is easier than forcing large pieces to catch.

Burn it cleanly

Wet wood is the main cause of dirty burning. It wastes energy evaporating water, smokes, and deposits creosote in the flue, which can fuel a chimney fire. Burn seasoned wood, light fires with kindling and small splits rather than newspaper and large logs, and keep the flue clear and inspected on the schedule the appliance and local rules require. Operate the stove with properly dried fuel according to the appliance manufacturer's instructions, including its operating limits.

Sources and review basis

1. Burn Better, Breathe Better — DEFRA UK Air
2. Firewood — Wood Heat Organization
3. Good Firewood — Wood Heat Organization

The requirement to burn wood at 20% moisture or less follows DEFRA guidance. The cord and face-cord measurements, piece length and split-size guidance, stacking practice (off the ground, open sides, covered top, rows with airflow), drying times, dryness indicators and winter storage guidance follow the Wood Heat Organization. Species energy content and drying times vary with local climate and species, while the appliance manufacturer's instructions control how properly dried fuel is used. Review request: verify a source-supported moisture-meter procedure before adding measurement instructions. Verify tool-specific safety and maintenance guidance before adding sharpening instructions or claims about the most common causes of splitting injuries.