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As untreated timber cladding is a completely natural material, it is susceptible to weathering. From UV rays to rain, snow and ice, the weather throughout the year can change the appearance and structural integrity of your cladding boards. Luckily there are eco-friendly options for protecting your timber against the elements.

To learn more, in this article we will take a closer look at exactly how weather affects timber, along with some great preservation tips for long-lasting cladding.

How Does the Sun Affect Timber Cladding?

There are two main ways that the UV rays from the sun affect your timber cladding.

Colour-Changing

The first is by fading the colour of your untreated timber, with most species taking on a silvery-grey hue from extended sun exposure. Depending on the conditions in which your timber is situated (such as how many hours of direct sunlight it is exposed to every day) and your timber species, your cladding could change colour after a few months of installation or a few years.

This type of weathering is not always negative, and many people love the look of naturally weathered timber. It tends to bring quite a contemporary aesthetic to modern buildings, with some designers even opting for pre-weathered timber to achieve the look faster.

Cracking, Shrinking, and Deterioration

Unfortunately, UV rays can also damage untreated timber cladding (particularly the less durable species). The sun can dry out the natural moisture in the timber, leading to shrinkage, warping, cracking and splitting. It can also cause a general deterioration of the timber fibres, weakening your cladding boards.

How Does Rain Affect Timber Cladding?

Timber is porous, meaning that it can soak up water until it is completely saturated. This can cause the cladding boards to swell and warp, leading to issues with your entire structure.

Excessive water can also make some timber species more vulnerable to rotting which if left untreated, will lead to the timber falling apart over time.

Can Snow and Ice Damage Timber Cladding?

Both snow and ice can cause a number of problems for less durable timber species. These introduce moisture to the wood, leading to the same issues mentioned above.

However, snow may also sit on your timber for longer periods of time than rain, amplifying the effects of moisture. It is also vital to be aware that if water enters a split in your timber and then freezes, it will expand, pushing the split to create a larger crack.

How to Protect Your Timber Cladding Against the Weather

Though weather absolutely can affect your timber cladding, it does not have to. There are a number of preventative measures you can take to help your timber handle all these weather conditions with ease, including:

  • Choosing a durable timber species for your cladding (e.g. Larch, Chestnut or Cedar)
  • Adding a protective UV treatment to prevent your timber colour from fading
  • Using a water-repellant treatment, stain or oil to add water resistance to your timber
  • Repairing splits and cracks quickly using a timber-safe filler or replacing affected boards

We want to emphasise that selecting the right species for your cladding will drastically reduce the chance of weather affecting your timber. We recommend using timber with at least a durability class 3, though class 2 or class 1 will provide even better resistance to weather-related issues.

Find the Right Timber For Your Cladding

Not sure how to balance form with function? Find a timber species which both suits your style and brings excellent durability to your project with the help of our team at EcoChoice. Get in touch to start chatting about your perfect timber.

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How weather effects wooden cladding

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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!

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

  • 3 years ago

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.

Janet Sycamore

  • 9 years ago

Excellent service and outstanding product

Cindy Dicks

  • 6 years ago

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

Stone Zone

  • 9 years ago

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

Malcolm Coury

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