Why Seasoning Is Really a Woodland Craft

Anyone who has tried to light a log that hisses and spits has learned the lesson the hard way. Freshly felled timber can be more than half water by weight, and every drop of it has to go somewhere before the wood will burn properly. Burn it wet and a large share of the heat is spent driving off moisture rather than warming the room. That steam cools the fire, and incomplete combustion leaves tar and creosote deposits coating the inside of the flue — the sort of thing that keeps chimney sweeps in business and chimney fires in the local paper.

Seasoning, then, is not a chore bolted onto woodland work. It is part of it. Good firewood is the difference between a by-product that gets burned badly and a genuinely useful yield from a thinning or coppice cut. Get it right and the economics of looking after a wood start to stack up, which is what keeps good management going year after year.

Start with the Right Wood and the Right Cut

Almost any British species will burn, but they behave differently. Ash, oak, hawthorn, field maple, birch and the wild cherry are all reliable, and ash has long been the traditional favourite — though ash dieback means a great deal of it is now being felled earlier than anyone would like. Softwoods such as pine and larch season quickly but burn fast and hot, so keep them for kindling or for mixing in with denser hardwoods.

Splitting is where drying really begins. Moisture leaves a log chiefly through its end grain, and bark is an effective raincoat. Halve or quarter your roundwood so you expose fresh surfaces and shorten the distance water has to travel to escape. Aim for pieces roughly 8–12cm across: big enough to burn steadily, small enough to dry within a season. Split while the wood is green and straight-grained, because seasoned oak can feel like iron and will blunt an axe faster than you would think.

Stacking for Airflow: The Detail That Matters Most

A seasoned stack is really a slow, passive kiln, and its fuel is moving air. Give the breeze somewhere to go and the wood will dry itself; smother it and you have simply built a damp pile.

• Get the wood off the ground on pallets, bearers or a couple of old fence posts. Ground contact wicks moisture upward and rots the bottom row.
• Leave generous gaps between logs. A loose criss-cross stack or a single row against a wall of air is far better than a tight, neat heap.
• Face the open side of the stack towards the prevailing wind — usually south-west in Britain — and let the sun get at it.
• Keep it away from house walls, sheds and fences, which block airflow and trap damp.
• Raise it far enough that air moves underneath as well as through.

If you have the space, a single row along a sunny fence is the fastest arrangement of all. It takes more room, but it dries in half the time of a deep block.

Cover the Top, Not the Sides

This is where well-meaning woodpiles go wrong. A tarpaulin thrown over the whole stack stops rain getting in, but it also stops moisture getting out, and you end up with a soggy core wrapped in a dry crust.

Cover the top only, with a good overhang, and leave the sides open to the wind. A sheet of corrugated iron, a piece of old roofing felt or a length of weighted tarp will do perfectly. Weight it down properly, because a loose cover in a January gale becomes a sail. If you have a open-fronted log store, so much the better, but never seal firewood into a closed shed or garage — it will simply sit there stewing.

How Long, and How to Tell It's Ready

As a rough guide, softwoods need six to nine months, and hardwoods a full year, often two for oak and other dense species. Splitting and stacking early in the spring gives you the best part of two drying seasons before the following winter.

You are looking for a moisture content of under 20 per cent, and ideally nearer 15. Without a meter, use your senses. Well-seasoned logs are noticeably lighter than green ones, the end grain has darkened and developed radial cracks, and bark comes away easily. Bang two pieces together and you should hear a clean crack rather than a dull thud. A cheap moisture meter is a worthwhile investment if you are selling or burning a lot — split a log and test the freshly exposed face, not the weathered outside.

Seasoning in the Wider Conservation Picture

Firewood is the engine that makes much conservation woodland work possible. Coppicing hazel, sweet chestnut or ash on a rotation of anything from seven to twenty years lets light reach the woodland floor, and that flush of growth supports dormice, fritillaries, nightingales and a host of other species that need open, sunlit woodland. Thinning lets the best trees develop into timber. Neither happens without somewhere for the produce to go.

Well-seasoned firewood is that somewhere. It turns a management cost into a modest income, offsets the fuel used to get to the wood, and gives the whole operation a point. The one courtesy worth remembering: a stack left sitting on the ground can become a hedgehog's winter quarters, so if you need to move one between November and March, lift it gently and check what is underneath before you do.