
Understanding Wood Density
and How it Affects Firewood Quality

What Is Wood Density and Why Does It Matter?
Wood density refers to how tightly packed the fibres of the wood are. It’s essentially the weight of the wood per unit volume, usually measured in grams per cubic centimetre (g/cm³). Denser woods, such as oak and ash, are heavier and contain more energy per log. This means they burn hotter and for longer compared to lighter, less dense woods like pine or spruce.
How wood Density Impacts Your Fire
- Longer Burn Time: Dense logs burn slower, giving you a steady, longer-lasting fire.
- Higher Heat Output: With more tightly packed fibers, dense woods store more energy, delivering consistent, high heat.
- Cleaner Burn: Denser, dry logs produce less smoke and ash.
- Better Value: Dense logs burn hotter for longer, offering more heat for your money.


Moisture Content: The Other Key Factor
While density matters, moisture content is just as important. Even the densest log won’t burn well if it’s too wet. That’s why all firewood is meticulously dried to below 20% moisture and certified Ready to Burn. This guarantees that it lights easily, burns efficiently and produces minimal smoke and ash.
A Look at Wood Densities
Here’s how the density of popular firewood types compare:
- Sun Dried Premium Hardwood:* 625 kg/m³
- Kiln Dried Premium Hardwood:* 500 kg/m³
- Kiln Dried Oak: 450 kg/m³
- Kiln Dried Ash: 430 kg/m³
- Kiln Dried Birch: 400 kg/m³
* At Firewood.co.uk we source our premium hardwoods based on density, so even if the exact species vary, you’ll always get top-performing, high-energy firewood.
Choosing the Right Wood Density for Your Needs
The best wood density for you depends on your specific preferences. If you want long-lasting, steady heat, opt for denser hardwoods like our Premium Hardwood, Oak, Ash or Birch. For short bursts of warmth – like starting a fire - lower density softwoods like pine or spruce can be helpful. However, keep in mind that softwoods burn faster and produce less overall heat.
Firewood.co.uk: Your Partner for a Perfect Fire
At Firewood.co.uk we believe in quality, reliability, and sustainability. Our oak, ash, birch and premium grade logs are selected for their superior burn quality and expertly dried for optimal performance. All our firewood is dense, dry, and ready to deliver exceptional heat. Whether you’re fuelling a wood burner, stove, or fire pit, we’ve got the right wood for the job.
All our firewood is responsibly sourced from sustainably managed forests. So when you buy from Firewood.co.uk, you’re not only getting premium firewood – you’re making an environmentally friendly choice, too.

Explore our range and discover the perfect logs for your home. Your perfect fire starts here!
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