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From the viral Kintsugi method of repairing broken ceramics to the centuries-old art of making Sushi, Japan is celebrated for perfecting cultural techniques. The consciousness, discipline and skill which go into these art forms is second to none. So it is no surprise that in the timber world, we are fascinated by Yakisugi, the ancient Japanese method of preserving wood.

What is Yakisugi?

Yakisugi literally translates as ‘Burnt Cedar’. This is a very descriptive name for the method at hand, which involves preserving and distressing timber with fire.

Yakisugi (otherwise known as Shou Sugi Ban) is mainly carried out on timber destined for exterior uses. It is commonly used, for example, as cladding for traditional Japanese homes, and is quickly becoming a popular architectural feature for unique, contemporary Western homes.

The Yakisugi Process

Traditionally, Yakisugi was only ever carried out on high-quality cuts of Japanese Cedar. Now, though, other timber species are frequently used in this unique preservation process, including Larch and European Redwood.

Before beginning, the timber boards are carefully selected based on their quality and structural integrity. They are left to dry in the sun, removing much of the natural moisture from the timber.

The timber is then burnt using fire. This creates a layer of black charring on the surface of the wood for a distinctive look, while also changing the properties of the wood. After charring, the timber is carefully cooled and brushed, before an oil is applied to finish the process.

The Benefits of Yakisugi

There is a reason this age-old technique has withstood the test of time, and that is down to the many benefits it brings to timber.

Charring the Cedar (or other timber species) changes the structure of the wood, creating a more durable surface with a better resistance to insect infestation, fungal infestation and general wear and tear. It can also prevent the timber from absorbing water, reducing the chance of rot and swelling even when used outdoors, thus helping the timber last longer.

It is also pretty amazing that using fire on the timber actually creates a more fire resistant product. The outer, blackened surface is far less flammable than untreated timber, making it a safer option for cladding and other uses indoors.

As sustainable timber enthusiasts, we love that Yakisugi is a chemical-free method of preserving and enhancing timber. Completely natural and without any toxins, it is a fantastic eco-friendly option.

Yakisugi Vs. ThermoWood

If you have been keeping up with the EcoChoice community for some time now, you probably will have drawn comparisons between Yakisugi and ThermoWood. While both methods use heat to create more durable timber, they are not quite the same.

ThermoWood does not charr the surface of the timber. Instead, it utilises heat and pressure in a controlled environment to change the structural properties of the wood without affecting its appearance.

Yakisugi, on the other hand, burns the timber directly. This does change the appearance of the wood, leaving it with a very distinct burnt outer layer which looks almost to be cracked (though it is not), and is one of the reasons it is such a popular technique among architects.

Find ThermoWood at EcoChoice

While we do not currently offer Yakisugi-treated timber at EcoChoice, we do supply ThermoWood in the UK. As a sustainable way of treating timber, this is a fabulous choice for construction projects which need wood with a little extra oomph.

Ready to order? Get in touch with us today.

What is yakisugi

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Our timber experts have years of experience and will be able to match the perfect species to your project, as well as provide a quote for sustainable timber at highly competitive prices.

Frequently asked questions

Do you supply timber for domestic uses?

Yes, we supply timber for domestic applications as well as commercial and public constructions. From garden decking to shed cladding, we will be happy to supply smaller deliveries for home use.

Is your timber FSC-certified?

Yes, all timber we supply is FSC or PEFC certified and sourced from independently verified responsibly managed forests. If we can’t find your request in FSC/PEFC certified timber we’ll suggest an alternative that is certified or clearly note that the offer is minimum EUTR.

Where does EcoChoice deliver to?

EcoChoice delivers to construction sites, warehouses and homes across the UK, as long as there’s access and unloading for our trucks.

What are the best timber species for exterior use?

There are many different timber species suitable for exterior use and which is the best for your project depends on your requirements. In general, though, we recommend EkkiGreenheartOpepe and Oak for heavier civil/marine uses. For intermediary external use such as decking, where the timber needs to be both strong and durable but not on the same level as civil engineering (bridgespiling, etc) we usually supply CumaruIpe, Jatoba, and Balau. And for the lighter exterior use where the timber is non-structural such as cladding, we deliver CedarLarchThermowood and others.

Which timber is the most durable?

Durability Class 1 timbers are the most durable. This of course depends on the use (hazard) class they’ll be in service for. For direct ground and water contact such as sleepers, fenders, marine piling, etc, Ekki and Greenheart are known to be the most durable timbers available. For decking and cladding where there’s no direct ground contact (use class 3) there’s a much wider range of timbers such Larch, Cedar, Thermo modified Pine or Ash and others.

What’s the best timber for internal cladding?

Internal cladding, where your timber is not in ground and not exposed to the elements can be classed as either use-class 1 or 2 – in which case most timbers will meet this durability criteria. That is not to say they’ll be the best, since internal environments have lower humidity (moisture) levels than outside. So in these cases, it’s best to go for a kiln-dried timber cladding board as these are more stable and delivered already in lower MC (moisture content) than the usual fresh sawn timbers sent to external applications. A word of caution – as timber reacts to variations in moisture, it’s best to avoid cladding any areas inside your bathroom.

How can I make decking less slippery?

The first thing is to ensure your deck boards are kept clean from leaves and other debris which will, over time, cover the surface and make it more slippery. Grooved boards can be used to improve grip if installed and used perpendicular to traffic, so especially useful in narrow passages and footbridges. Lastly, you can add our Grip-Choice strips: these are a mix of epoxy with aggregates that add gripping ridges to your deck area. Gripchoice is an easy way to make decking less slippery and safer, especially over large areas or where there’s high traffic. We can pre-install Grip-Choice strips for your decking before delivery or ship the strips separately to add to your existing deck’s grooves as a retro-fit solution.

What wood machining services do you offer?

We can offer planing, sawing, drilling and profiling of rough-sawn wood to any profile you require: from handrails to large port fenders.

Can you supply pre-drilled timber?

Yes, we will be happy to provide pre-drilled timber which is tailored to your needs for quick installation, thus saving you valuable time on site.

What cladding profiles do you supply?

We provide a wide range of cladding profiles, including tongue and groove, featheredge and shiplap. You can check the standard profiles here – but we can also match or custom make profiles to suit your specific needs.

Does timber change colour?

Yes, timber is well-known for changing colour over time. Some species can darken quickly right after installation, and like most untreated wood will eventually weather to a beautiful silver-grey. Interior timber is less likely to change colour (depending on conditions), and timber can be stained, painted or treated with UV-resistant oils to reduce colour change.

Do I need to treat exterior timber?

Some timbers such as Oak and Ekki, can withstand the strains of exterior use without any treatment. However, to extend the lifespan and maintain the aesthetic of your wood, we do recommend treating your timber with stains and oils. Pre-treated timber, such as ThermoWood and OrganoWood, are low-maintenance options which are more durable, but can have their life service extended by applying a clean and stain maintenance schedule.

Do I need to treat interior timber?

Depends on what area the timber is being used. For floor joists and timber rafters, it is common to see timber treated, or least very well kiln-dried. Other uses such as flooring may benefit from varnishing while internal timber cladding for decorative purposes shouldn’t require any treatment other than if you want to change its colour with different types of stains or oils.

Where are you based?

We’re based in Cambridge, UK, and coordinate multiple sawmills all over the world to manufacture your order. We then organise delivery with a range of hauliers so that your orders gets to your site on time.

What are the usual decking sizes?

Timber decking is usually 21x140mm or similar. For heavier applications where there’s more load and traffic, we deliver 35 or 45mm thick boards (such as Hastings Pier). Narrower boards are also possible: 95-90mm is a standard width – but we can manufacture whatever size you require.

What are the usual cladding sizes?

Typical cladding section sizes are 18×95 and 18x145mm although we can always custom make a section to suit your project’s design requirements. That includes waney edge boards in Oak or Chestnut as well as extra wide 195mm boards.

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Good quality, great service, fast delivery!

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Marinella Li

Always helpful! One of our valued TDCA DeckMark and CladMark accredited supplier members which means their quality procedures are routinely audited and stand up to scrutiny giving you extra peace of mind.

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Janet Sycamore

Having needed the supply of cladding, decking boards and other specified timbers through out the year Eco choice have been very helpful in sourcing the specified timbers and quantities required at a very competitive price.

5

Tim Saunders

Great quality, service and price. A pleasure to deal with. I would highly recommend Eco Choice.

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Emma Hurrell

Fantastic company- Mike and the team are the best in the business- worked with them for many years.

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Great service, quality products and very easy to deal with. Thank you.

Malcolm Coury

  • 6 years ago

Having needed the supply of cladding, decking boards and other specified timbers through out the year Eco choice have been very helpful in sourcing the specified timbers and quantities required at a very competitive price.

Tim Saunders

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