If you’ve got a wood burner or open fire, you need somewhere to store seasoned firewood where air can circulate and rain can’t reach it. A purpose-built log store is the answer, and if you build one from reclaimed pallets, it costs virtually nothing. This is a satisfying weekend project that uses basic tools and skills.
Why Proper Firewood Storage Matters
Burning wet or unseasoned wood produces less heat, creates excessive smoke, and deposits creosote inside your chimney — which is a fire hazard. Firewood needs to be stored off the ground, with good airflow on all sides, and protected from rain on top. A well-designed log store achieves all three. The HETAS guide to burning wood explains why properly seasoned firewood matters for efficiency, safety, and air quality regulations.
What You’ll Need
Materials
- 4–6 standard pallets (1200mm × 1000mm Euro pallets work best — consistent size)
- Roofing felt or corrugated bitumen sheet (Onduline) for the roof
- 75mm exterior screws (stainless or coated)
- 50mm exterior screws
- Wood preserver or exterior wood oil
- 2× 2400mm lengths of 50×50mm treated timber (roof frame)
Tools
- Cordless drill/driver with impact setting
- Circular saw or reciprocating saw
- Spirit level
- Tape measure
- Staple gun (for roofing felt)
- Square for checking corners
Choosing the Right Pallets
Look for pallets stamped HT (heat treated) — these are safe for home use. Avoid pallets stamped MB (methyl bromide) as these have been chemically treated. Also avoid pallets that are visibly rotten, heavily warped, or have broken structural boards.
Good sources of free pallets include building sites, garden centres, industrial estates, and local marketplaces. Always ask before taking — most businesses are happy to give them away as it saves them disposal costs.
Step-by-Step Build
Step 1: Prepare the Base
Lay one pallet flat on the ground as your base. This keeps the firewood off the damp ground, which is crucial — moisture wicks up from soil into wood quickly. Level the ground beneath the pallet first. If the area is prone to mud or flooding, lay concrete blocks or paving slabs underneath for a stable, elevated foundation.
Step 2: Attach the Back Wall
Stand a pallet upright along the back edge of the base pallet. Screw through the base pallet’s frame into the bottom rail of the back wall using 75mm screws — use at least 4 screws along the base, two at each end and two spaced evenly in between. The back wall provides structural rigidity and stops logs from tumbling backward.
Step 3: Attach the Side Walls
Stand pallets on each side and screw them to both the base and the back wall. Use 75mm screws at each connection point — sides to base, and sides to back wall. Check everything is square with a builder’s square or by measuring diagonals. The gaps between pallet slats are a feature, not a bug — they allow air to circulate around the firewood, which is essential for proper seasoning.
Step 4: Build the Roof Frame
Cut two lengths of 50×50mm treated timber to span from front to back, with a slight slope toward the back — about 50mm drop over the depth of the store. This ensures rainwater runs off the rear rather than dripping onto logs at the front where you access them. Screw these to the top of the side walls.
Step 5: Attach the Roof
Lay pallet boards or a sheet of exterior plywood across the roof frame timbers. The roof should overhang the front by at least 50mm to create a drip edge. Cover the boards with roofing felt, folding it over the front and rear edges, and staple it down securely. Alternatively, use a corrugated bitumen sheet (Onduline) for a longer-lasting roof that doesn’t need replacing every few years. Fix with appropriate Onduline screws through the crown of each corrugation.
Step 6: Treat All the Wood
Apply a generous coat of exterior wood preserver to all surfaces, inside and out. Pallet wood is not pressure-treated, so this step is essential for longevity. Pay special attention to end-grain and the bottom rails which sit closest to the ground. Cuprinol’s exterior range works well — their Trade Preserver gives good long-term protection. Reapply annually.
Design Tips for a Better Log Store
- Leave the front completely open — easy access and maximum airflow are the priorities
- Position for sun and wind — both help dry the wood faster. South or west-facing is ideal
- Leave a gap behind — don’t press the store tight against a wall. A 50–100mm gap allows airflow behind the stack
- Consider a divider — split the store into two bays to separate this season’s ready-to-burn wood from next season’s seasoning logs
- Raise the base further — if you have the materials, stacking two pallets as the base improves airflow underneath significantly
How Long Does Firewood Take to Season?
| Wood Type | Seasoning Time | Heat Output | Notes |
|---|---|---|---|
| Ash | 12 months | Excellent | Can burn slightly green — but don’t |
| Oak | 18–24 months | Excellent | Needs longest seasoning |
| Birch | 12 months | Good | Burns fast, good kindling |
| Pine/Spruce | 6–9 months | Moderate | More sap, creosote risk if unseasoned |
| Beech | 12–18 months | Very good | Dense, long-burning |
The moisture content should be below 20% before burning — you can check this with an inexpensive moisture meter (£10–£15 from any tool shop). A well-ventilated log store dramatically speeds up the seasoning process compared to tarpaulin-covered stacks, which trap moisture and encourage mould.
Scaling Up
Once you’ve built one pallet log store, building a second is trivial — and you’ll almost certainly want one. Having two stores lets you operate a rotation system: fill one with freshly cut wood and draw from the other for burning. By the time the burning store is empty, the seasoning store is ready. This ensures you’re never caught short with wet wood in the middle of winter.
