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Home > Blogs > Decking Hub > How Thermo Ash Decking Weathers Over Time
Maintenance Guide

How Thermo Ash Decking Weathers Over Time

Jul 07, 2026 6 min read Southgate Timber

When customers choose Thermo Ash decking, they are often drawn to its rich colour and refined appearance. But like any natural timber used outdoors, Thermo Ash will not stay exactly the same forever. It will weather over time, and understanding that process helps customers make a more confident decision from the outset.

In this article

  • What weathering means
  • Whether colour change is normal
  • How quickly it happens
  • Can original colour be preserved?

What Does Weathering Mean?

Weathering refers to the natural visual changes timber goes through when exposed to sunlight, rain and the outdoor environment. For Thermo Ash decking, this usually means the original tone gradually begins to soften and move towards a more muted and silvered appearance.

Does That Mean Something Has Gone Wrong?

No. Weathering does not mean the decking has failed. It simply means the timber is responding naturally to exterior exposure, which is one of the defining features of real timber.

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How Quickly Does the Colour Change?

The speed of change depends on the conditions the decking is exposed to. Sunlight, shade, moisture and the overall environment all influence how quickly the original tone changes.

Can You Keep the Original Colour for Longer?

Yes, but it requires maintenance. Customers who want to preserve the original appearance of Thermo Ash are more likely to use oiling or other maintenance measures as part of their long-term care plan.

Decking Weathering Thermo Ash Maintenance

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Frequently asked questions
Common question around this topic and what it means for your project.

Will Thermo Ash decking change colour outdoors?

Yes. Like many natural timber products, it will gradually soften in tone and may move towards a silver-grey appearance if left untreated.

Does weathering mean the decking has failed?

No. Weathering is a natural visual change rather than a sign that the product has failed.

Can I maintain the original colour for longer?

Yes. Oiling and routine maintenance can help preserve more of the original rich tone if that is the preferred finish.

Need help choosing the right decking?

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