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The construction industry is on a mission to cut carbon emissions. As a crucial component of the country’s push towards net zero, there is growing pressure across commercial, domestic and public works to reduce reliance on high-footprint materials, which is where timber comes in. Renewable and biodegradable, timber boasts a range of eco-friendly specifications which make it a priority in sustainable construction. Its standout eco-friendly feature, though, lies in its carbon sequestration; a process which is crucial for low-carbon projects.

Learn in this guide what carbon sequestration is and how it boosts the sustainability of the UK construction industry.

What is Carbon Sequestration?

Carbon sequestration is a process which captures and stores carbon dioxide (CO₂). In the case of timber, this happens naturally as trees grow and photosynthesise, absorbing CO₂ from the air and storing it within their fibres, roots and trunks. When timber is harvested and used in construction, the stored carbon remains contained within the material for as long as the timber remains in use, effectively acting as a long-term carbon store, turning decking, cladding and entire buildings into long-term carbon stores.

Timber vs High-Emission Materials

When looking at construction materials, standard alternatives to timber are typically concrete, steel and aluminium. The issue with each of these is that they are highly energy-intensive to produce and release significant amounts of CO₂ into the atmosphere. Steel, for instance, releases approximately 1.4 tonnes of CO₂ per tonne of steel, while concrete stands at around 0.6 tonnes of CO per tonne

Timber, on the other hand, is comprised of around 50% sequestered carbon. The world’s forests show widescale sequestration in action, absorbing around 7.6 billion tonnes of CO₂ every year, and playing a significant role in securing the safety of our planet – both for us now, and for future generations.

The Role of Sustainable Forestry

Carbon sequestration works best when timber is sourced from sustainably managed forests. In these systems, harvested trees are replaced with new planting, ensuring forests continue to absorb CO₂ over time in a healthy, long-lasting cycle. As younger and fast-growing trees are particularly effective at carbon uptake, this responsibly managed felling and re-planting can help maintain a continuous cycle of carbon absorption and storage.

At EcoChoice, we supply only timber from sustainable forests. Working with independent certifiers such as the FSC and PEFC, we ensure that your timber is part of a carbon sequestration cycle which continues long after your project is done.

Carbon Sequestration Over Timber’s Lifecycle

The carbon benefits of your PEFC and FSC-certified timber extend beyond the building phase. Over the lifespan of your construction, the timber elements continue to store carbon, as well as bringing other sustainable perks to your project, such as thermal insulation which boosts energy efficiency. At the end of its life, timber can be reused or repurposed, extending the impact of carbon sequestration for a long and sustainable lifecycle. 

Buy Sustainable Timber for Construction

Whether you are working with public-sector sustainability regulations or want to offer more sustainable services to your clients, we can help. EcoChoice supplies a wide range of sustainable timber species, all of which come from responsibly managed forests. Make the most of your eco-friendly construction choices with timber which actually makes a difference.

Get in touch to start an order of sustainable timber.


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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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What our customers say about us

Good quality, great service, fast delivery!

5

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.

5

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.

5

Emma Hurrell

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

5

Prem Raja

Always reliable and quality products, easy to deal with company.

5

Stone Zone

4.9

Average rating on Google Reviews

  • 6 years ago

Always reliable and quality products, easy to deal with company.

Stone Zone

  • 9 years ago

Experts in Timber, Nationwide delivery

Joe Middleton

  • 6 years ago

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

Emma Hurrell

  • 9 years ago

Wonderful guys!

Nicola Edmead

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