Why does timber have a negative carbon footprint?

There is a material revolution happening in the construction industry and it’s having a major positive impact on the environment. By swapping cement and steel for timber, the notoriously polluting construction sector could not only avoid greenhouse gas emissions but actually make their projects carbon negative. This is because timber acts as a natural carbon sink – storing the CO2 that’s taken from the air by the trees that are harvested and used to create timber.

How does it work?

Mother Nature is quite clever really. Indeed, our planet has natural mechanisms in place to help keep carbon dioxide at optimum levels.

As a natural product, wood is designed to help keep the balance in check using photosynthesis, which takes carbon from the atmosphere and converts it into wood, which is mostly carbon based atoms.

During this process, as only sunlight and water are required to fuel it, CO2 is absorbed and broken down so that oxygen is released back into the atmosphere whilst the carbon remains in the wood.

In this manner, wood effectively acts as a carbon sponge and that’s why forests play such a vital role in the global carbon cycle – now more than ever as we pump increasing amounts of CO2 in the atmosphere.

Thanks in no small part to the intervention of the FSC, some forests are protected, resilient, and capable of producing large volumes of timber sustainably. This means that construction projects built primarily using materials derived from these forests might have a minimal or even negative carbon footprint.

Using buildings as carbon stores

The construction industry is responsible for 39% of all carbon emissions worldwide so something truly needs to be done to help them change their ways. There are many things they could be doing to help cut down their carbon footprint, but using wood-based materials in their projects is a great place to start.

The largest potential, of course, lies in external walls (timber cladding), floors, and roofing, which, together with the frame and insulation. can significantly reduce the carbon footprint of a building if built with timber. Huge amounts of carbon can potentially be stored in a building over the course of its life as long as it is well-maintained.

What’s more, any wooden parts of the buildings that are no longer used can also be easily recycled into other products such as furniture, toys, etc – keeping the carbon locked away as the wood enjoys a new lease of life.

Looking ahead

An increased use of timber is perhaps one of the most logical ways that the construction sector can help to stabilise an increasingly unstable climate. But there needs to be a major change if we have any hope of really making an impact.

If business is to continue as usual, for example, then just 0.5% of new buildings will be built with timber by 2050. If mass timber manufacturing increases, however, then studies have suggested that as much as 90% of timber construction is conceivable. This would result in a world where 700 millions tonnes of carbon are stored per year.

There are currently 11,000 million tons of carbon being emitted per year, so this would only offset a percentage of the damage being done. However, if the construction sector, one of the world’s most notoriously polluting, can set a precedent by making a more considered move into a more sustainable future then it’s only surely a matter of time before the rest of the world follows suit.

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Unsure which timer is best for your project?

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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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.

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

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

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