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When installing external timber cladding, a factor to consider is weathering. As with any material (even plastic!), your timber isn’t going to look the same after years of rain and UV exposure, and will often change colour after installation. But, how long does this take? To learn more, our EcoChoice timber experts have everything you need to know.

What is the Timber Weathering Process?

Timber is an organic material and, when left uncoated, it’s guaranteed to change colour in a process known as weathering. This is largely because of the effect of UV rays and water, as well as fluctuations in humidity and oxidisation. As your timber is exposed to the natural elements, the natural shade begins to shift, usually first becoming darker and then transitioning into a beautiful, silvery-grey hue.

Weathering is by no means a bad thing. In fact, many people love the weathered aesthetic of timber and will even purchase pre-weathered boards for their buildings! It shouldn’t affect the functionality of your timber, either, leaving it just as tough and hardy as when it was installed (with the right care, of course).

How Long Does Timber Cladding Take to Weather?

Love it or hate it, untreated timber cladding is going to become silvery-grey. But the speed at which your wood weathers isn’t going to be the same across buildings, with a number of factors affecting the rate it changes colour. These include:

  • How much rain and sun the timber is exposed to
  • The timber species you’ve chosen
  • The design of the building

So, for example, a southwest-facing building in an area of high rainfall will weather quickly, as will the areas that are more exposed to the elements, like beams higher up the building away from the shelter of surrounding houses.

Completely naturally durable species such as Western Red Cedar or Larch will on average take longer to weather than a thermally modified species such as Thermo Redwood or Thermo Ayous.

Put all the factors together that speed up weathering, and your timber could turn grey in a few months. In drier, darker conditions, though, you may maintain the natural hue of your wood for a few years.

How to Prevent Timber Weathering

As we mentioned, some people will actively pay more for pre-weathered timber. However, if you prefer to keep your wood looking naturally colourful, there are ways you can prevent weathering.

The main option is to apply a finish to prevent weathering to your cladding. This will help to prevent colour fading due to sunlight and water, keeping a protective barrier between your timber and the elements. It should be re-applied every year or two, depending on the location of your building.

You can also stain, oil, or paint timber to stop those grey tones from seeping through. Though this will still affect the natural look of your cladding, it’ll maintain that fresh, bright colour for years to come.

Another preventative measure is to be considerate of weathering in your designs. By creating a more sheltered building, for example, you may be able to slow down weathering – though you won’t be able to stop it completely.

Choose Your Perfect Timber With Our Help

Regardless of your opinions on timber weathering, choosing the right species for your project will help you be happy from the get-go. If you need help finding your dream timber, give us a shout. Our team of timber experts will be happy to lend a hand, matching you with the perfect species for your unique cladding project.

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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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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.

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

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