1. Ignoring Timber Movement

Timber is a natural material, and it moves — even thermally modified options like Thermo Ayous. As humidity and temperature change, timber can expand, contract, or even cup if not installed properly. That’s why it’s essential to follow species-specific installation guidance. Even with interlocking profiles, always allow for movement at board ends and avoid over-tightening fixings. Without this, cladding can warp or crack over time.

2. Choosing the Wrong Profile for Your Project

Not all cladding profiles are created equal. Tongue & Groove, Channel Groove, Shiplap, and Rainscreen all create different finishes — and choosing the wrong one can make your build look either overly traditional or too modern for its setting. Profiles also impact water run-off, shadow lines, and fixing styles. If you’re unsure what suits your vision, we’re always happy to advise based on style, performance, and budget.

3. Skipping Ventilation Gaps Behind the Cladding

Timber needs to breathe. One of the most common mistakes is fixing cladding directly onto a wall without leaving a rear ventilated cavity. Without airflow behind the boards, moisture gets trapped — which can lead to rot, mould, or accelerated decay. You should use treated battens to create an airflow gap behind.

4. Using the Wrong Fixings

Poor fixings can ruin a great cladding job. Using galvanised fixings instead of stainless steel can lead to black staining or even board damage over time. We always recommend stainless steel fixings which we stock here at Southgate Timber, so you can purchase the appropriate fixings along with your timber.

5. Thinking All Timber is the Same

Timber may look similar at first glance, but performance varies drastically. Premium options like Western Red Cedar offer natural durability, while Thermo Ayous combines modern aesthetics with dimensional stability and long life thanks to its thermal treatment. Investing in the right species upfront can save cost and hassle long term.

Final Thoughts

Choosing the right timber cladding isn’t just about aesthetics — it’s about smart decisions that affect installation, performance, and maintenance. Avoiding these five mistakes means fewer problems and a finish that looks great for years to come. If you’re starting a project and want to get it right from the start, speak to our team — we’re happy to guide you through timber selection, profiles, fixings, and more. Explore our cladding range online or get in touch for expert advice.