Timber cladding is one of the most attractive and sustainable ways to finish a building. Its natural warmth, texture, and character make it popular for both residential and commercial projects across the UK. But like all exterior surfaces, timber cladding is exposed to the elements. After summer, when your cladding has endured months of sunshine, occasional rain showers, dust, pollen, and airborne pollution, it’s a good idea to give it some care and attention.
Proper cleaning not only preserves the look of timber cladding but also extends its lifespan and protects your investment. In this guide, we’ll cover why post-summer maintenance is important, how to clean timber cladding safely, the tools and products you’ll need, and additional steps you can take to keep your cladding in peak condition throughout the year.
Why Clean Timber Cladding After Summer?
The summer months may feel relatively kind to timber compared to winter, but they still leave their mark. UV exposure, dry weather followed by sudden showers, and airborne debris all affect your cladding. Some of the most common issues include:
- Dust and pollen build-up – particularly noticeable on lighter timbers like cedar and Douglas fir.
- Surface discolouration – caused by strong UV exposure or by pollutants in the air.
- Algae or mildew growth – especially in shaded or north-facing areas that don’t dry quickly after rain.
- Movement in the timber – heat and sun can cause expansion and slight surface cracking, which makes regular cleaning and inspection more important.
By cleaning timber cladding in early autumn, you remove surface contaminants before winter weather arrives. This helps reduce the risk of water staining, rot, and long-term damage while also restoring the timber’s natural beauty.
Preparing to Clean Timber Cladding
Before you start, a little preparation goes a long way:
- Check the manufacturer’s recommendations – some timbers (such as charred cladding) require specialist care.
- Inspect the cladding – look for damaged boards, loose fixings, or areas that may need repair before you begin cleaning.
- Choose the right day – a cool, dry, overcast day is ideal. Avoid direct sunlight as it can cause cleaning solutions to dry too quickly and leave streaks.
Tools and Materials You’ll Need
To clean timber cladding effectively, gather the following items:
- A soft-bristle brush or broom
- A bucket of warm water
- Mild detergent (non-abrasive, pH-neutral soap)
- A garden hose with a spray attachment (not a pressure washer)
- A sponge or microfibre cloth
- Optional: specialist timber cleaner or algae remover
- Safety gear, such as gloves and protective eyewear, if using cleaning products
Step-by-Step Guide to Cleaning Timber Cladding
1. Remove Loose Dirt and Debris
Begin by brushing the cladding with a soft-bristle brush to remove surface dust, cobwebs, and loose debris. Always brush along the grain of the wood to avoid scratching the surface.
2. Wash with Mild Soapy Water
Mix a mild detergent in a bucket of warm water. Using a sponge or cloth, gently scrub the boards, working in manageable sections. Pay extra attention to shaded areas or places where dirt and algae are more likely to collect.
3. Rinse Thoroughly
Rinse the cladding with clean water using a hose on a gentle spray setting. Avoid using high-pressure washers, as these can damage the timber fibres and force water into joints.
4. Tackle Algae and Stains
If you notice green algae, mildew, or stubborn stains, apply a specialist timber cleaner or an algae remover recommended for exterior wood. Follow the manufacturer’s instructions carefully, and always test on a small area first.
5. Allow to Dry Naturally
Leave the cladding to dry naturally. Good airflow around the boards will help the timber dry evenly and reduce the chance of future problems.
Should You Re-Treat Timber Cladding After Cleaning?
Cleaning alone will freshen the appearance of timber cladding, but you may also want to consider re-treatment depending on the type of wood and the finish you prefer.
- Larch cladding – naturally durable and often left untreated, but applying UV-protective oil can preserve its warm tones.
- Cedar cladding – benefits from oiling to maintain its reddish hues and prevent greying.
- Douglas fir cladding – durable and resin-rich, but still benefits from protection against UV and moisture.
- Charred timber cladding – generally low maintenance, though a light clean will help preserve its striking appearance.
Re-coating or oiling should only be done once the timber has fully dried. Always apply products in line with the supplier’s recommendations.
Avoiding Common Mistakes
It’s just as important to know what not to do when cleaning timber cladding:
- Avoid harsh chemicals – bleach and strong solvents can damage timber fibres.
- Don’t use a pressure washer – it may seem convenient, but it can cause irreversible harm.
- Don’t ignore fixings – check nails and screws for rust or movement. Replace if necessary.
- Don’t rush the job – thorough, careful cleaning is far more effective than quick fixes.
Long-Term Maintenance Tips for Timber Cladding
Cleaning timber cladding after summer is a great first step, but consistent maintenance will keep it looking its best for decades.
- Inspect twice a year – ideally after summer and winter, when the timber has faced the harshest conditions.
- Clear gutters and overhangs – prevent water from dripping directly onto the cladding.
- Trim nearby plants – reduce shade and moisture build-up that can lead to algae.
- Refresh finishes when needed – oils, stains, or fire-retardant coatings may need reapplying every few years.
Why Choose Timber Cladding?
Timber cladding remains one of the most sustainable and visually appealing building materials available. Its natural warmth and versatility suit everything from traditional cottages to modern architectural designs. Regular care ensures that your investment continues to provide both beauty and protection for decades.
At The Larch Cladding Company, we supply high-quality larch, cedar, and Douglas fir cladding in a wide range of profiles, including shiplap, tongue and groove, rainscreen, and square edge. We responsibly source our materials from sustainable forests and, as an FSC®-certified supplier (FSC-C134890), can provide FSC®-certified timber on request.
Keep Your Timber Cladding Looking Its Best
As summer ends, now is the perfect time to give your cladding a clean and prepare it for the seasons ahead. A little care goes a long way in maintaining the beauty, durability, and performance of your timber.
If you’d like advice on the best way to care for your timber cladding, or if you’re considering installing new cladding for your home or commercial project, our friendly team is here to help.Call us today on 01352 746293 or email info@thelarchcladdingcompany.co.uk to discuss your project or request a sample pack.