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If you are a regular on the EcoChoice blog, you will know that we talk a fair bit about the sustainability of timber as a building material. It is renewable, biodegradable and carbon sequestering, making it a great choice for your eco-friendly projects. But to understand fully the carbon cost of your project, you need to be able to calculate the footprint of your timber. That is where this handy guide comes in, making calculating carbon cost a breeze.

The Carbon Cycle of Timber

To understand more about the carbon cost of timber, it is good to look at the carbon cycle of wood products. This all starts as the tree grows, at which time it actually absorbs carbon dioxide from the atmosphere and converts it into oxygen, leaving the harmful carbon stored within the timber.

On average, around 50% of the total dry mass of a tree is carbon. Over the span of a year, a growing tree will absorb roughly 25kg of CO₂, with a cubic metre of timber storing a whopping ton of the notorious greenhouse gas by the time it is felled.

When chopped down for timber products, all this CO₂ is kept safe within the timber. This puts the starting carbon cost of your wood at around -25kg per tree, which is a great place to start!

It is useful to note, though, that by burning timber, this CO₂ will be released back into the atmosphere. This will also happen when the wood naturally decays, so using timber in a project and extending its lifespan is a great way to keep that CO₂ safely tucked away.

Calculating Your Timber Carbon Storage

Of course, not every plank of sustainable timber is going to store the same amount of carbon. If you want to get mathematical, you need to look at the water content of your timber, remove it from the total weight, and use 50% of the remaining weight as a good signifier of the carbon it contains.

Let’s take a 15% water content and 35lb timber board as an example. To work out the dry weight, you will need to divide the total weight by 1.15. Then divide the total by 2 to work out the average carbon content.

35/1.15 = 30.435

30.435/2 = 15.2175

So the average amount of carbon stored is 15.2lb.

Do not Forget Other Factors

Unfortunately, though, the carbon footprint of your timber is not always negative. There are other factors which come into play which can increase the carbon cost, including how the wood is processed, shipped and treated. If you use any finishes on your timber, the entire carbon footprint of that finish (including the CO₂ created during production and delivery) needs to be included in your project total.

Find Sustainable Timber at EcoChoice

If you are looking for eco-friendly timber with a lower carbon cost, we can help. At EcoChoice, we supply timber from responsibly managed forests to green projects around the UK, including for decking and cladding construction. By working with accreditations such as the FSC and PEFC, we can also source a lot of information on the supply chain of our timber, helping you calculate the total carbon cost of your project.

To learn more or start an order, get in touch with our team. We are always happy to help!

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Timber project carbon costs

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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.

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.

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

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  • 9 years ago

Wonderful guys!

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  • 2 weeks ago

Good quality, great service, fast delivery!

Marinella Li

  • 9 years ago

Experts in Timber, Nationwide delivery

Joe Middleton

  • 9 years ago

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

Malcolm Coury

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