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Home > Blogs > Decking Hub > Thermory Spruce Decking vs Thermo Ash Decking
Comparison Guide

Thermory Spruce Decking vs Thermo Ash Decking: Which Should You Choose?

Jul 14, 2026 7 min read Southgate Timber

If you are comparing thermally modified decking boards, Thermory Spruce decking and Thermo Ash decking are two strong options to consider. Both offer the appeal of real timber with the benefits of thermal modification, but they do not serve exactly the same purpose.

In this article

  • Appearance differences
  • Budget differences
  • Project suitability
  • Which one best fits your brif

Thermory Spruce Decking at a Glance

Thermory Spruce is a very practical and versatile modified timber decking option. It suits customers who want a natural timber deck with a modern look and dependable outdoor suitability without specifically chasing the most premium visual finish available.

Thermo Ash Decking at a Glance

Thermo Ash is more obviously premium in character. It tends to be chosen when the customer wants a richer, more refined and more architectural-looking deck.

Considering thermally modified decking?

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Appearance Differences

Thermo Ash generally feels more luxurious and design-led, while Thermory Spruce feels cleaner and more versatile. It still looks modern and attractive, but usually in a more understated and flexible way.

Which Should You Choose?

Thermory Spruce may be the better choice where versatility and a more controlled budget matter. Thermo Ash may be the better choice where premium finish and design impact are the main priorities.

Decking Comparison Thermory Spruce Thermo Ash

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Frequently Asked Questions
Common question around this topic and what it means for your project.

Which looks more premium, Thermory Spruce or Thermo Ash?

Thermo Ash is usually seen as the more premium, design-led option.

Which is more versatile for everyday garden spaces?

Thermory Spruce is often the more versatile choice for practical modern outdoor spaces.

How do I choose between the two?

The choice depends on the finish, budget and overall ambition of the project.

Need help choosing the right decking?

Speak to the Southgate Timber team for help comparing timber species, samples, fixings and the right option for your project.

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