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3 July 2026

Thicker Is Stronger: The Benefits of 40 mm Solid Wood in Stair Treads and Stringers

If you are comparing stair construction options, one question matters more than it may seem at first: how thick are the structural wood parts? In stair design, thickness directly affects strength, stability, feel underfoot, and long-term durability. That is why 40 mm solid wood in stair treads and stringers stands out as a meaningful construction choice.

When a staircase is used every day, the load is repeated thousands of times over its lifetime. A stair build that feels solid from day one is not just about appearance. It is also about how the treads and stringers work together as structural components. In this article, you will learn why 40 mm solid wood matters, how it benefits stair treads and stringers, and what it means for durability, performance, and everyday comfort.

What does 40 mm solid wood mean in a staircase?

40 mm solid wood refers to wood components with a thickness of approximately 40 millimeters. In a staircase, this is especially relevant for two critical parts:

When both treads and stringers are about 40 mm thick, the staircase benefits from a more substantial structural foundation. In practical terms, that often translates into a sturdier feel and improved resistance to everyday wear.

Why thicker stair components matter

The simplest answer is this: more material generally provides more structural capacity and stiffness. In wood construction, thickness influences how a component handles weight, movement, fastening, and repeated use.

For stairs, that matters because each step experiences:

A thicker component is often better equipped to manage those demands over time.

The benefits of 40 mm solid wood stair treads

1. Improved strength under daily load

The tread is the most frequently used part of any staircase. Every person using the stairs places their full body weight, and often additional carried weight, onto a relatively small surface area.

With 40 mm solid wood stair treads, the tread has a more robust section. This helps the stair feel more dependable in everyday use and supports long-term structural performance.

2. Greater rigidity and a more solid feel

One of the clearest differences in a well-built staircase is how it feels when you walk on it. Thicker treads can contribute to a firmer, more substantial underfoot experience.

That matters because a staircase should not only be safe. It should also feel stable and confidence-inspiring. A solid tread construction can reduce the sense of flex that lighter stair parts may allow.

3. Better resistance to wear over time

Stair treads take constant abuse. Shoes, impact, dirt, and repeated movement all affect the surface over the years.

While finish quality and wood species also play a role, 40 mm solid wood provides more material depth overall. That helps support long-term durability in a high-traffic part of the home.

4. Stronger fastening potential

Treads must connect securely to the staircase structure. In general, thicker wood gives more substance for joinery and fastening, which can support a stronger overall assembly when properly designed and installed.

For stair construction, secure connections are essential. They help the staircase behave as one integrated structure rather than a collection of separate parts.

The benefits of 40 mm solid wood stringers

1. A stronger structural backbone

If the treads are where the action happens, the stringers are what carry and distribute much of that structural demand. They are fundamental to the staircase’s overall integrity.

Using 40 mm solid wood stringers means the supporting framework is also substantial. This is important because even a strong tread system depends on equally reliable support beneath and alongside it.

2. Better stability across the full staircase

A staircase performs best when the support structure remains stable under repeated use. Thicker stringers can help create a staircase that feels more grounded and structurally coherent.

In practical terms, that supports:

3. Improved durability in load-bearing areas

Stringers are load-bearing parts. They do not just frame the stairs visually; they help carry the staircase over time.

Because they are under continuous structural demand, material thickness matters. 40 mm solid wood gives these components the substance needed for dependable, long-term use.

Why using 40 mm in both treads and stringers is important

A staircase is a system. Looking at only one part in isolation can miss the bigger picture.

The real advantage comes from the combination of:

When both major elements are about the same substantial thickness, the staircase can achieve a more balanced construction. That balance matters because strength in one part should be matched by strength in the parts connected to it.

40 mm solid wood and long-term durability

Durability is about more than first impressions

A staircase may look beautiful on installation day, but durability shows itself later. It shows up after years of daily use, changing indoor conditions, and ongoing structural stress.

40 mm solid wood supports durability because it provides a more substantial base material in the staircase’s key structural parts. In stair design, that is especially valuable in components that experience repeated loading and direct physical contact.

Everyday use adds up

Stairs are one of the most used structures in many homes. Unlike decorative elements, they must perform reliably every single day.

That repeated use makes material choices more important. Thicker solid wood in treads and stringers helps align the build with the demands of real-life use rather than just short-term visual appeal.

Practical advantages homeowners notice

Not every benefit of 40 mm solid wood is technical. Some are simply easier to feel and appreciate in day-to-day use.

Homeowners often value stair construction that delivers:

These practical benefits are part of what makes thicker wood an attractive choice in staircase construction.

Quick answer: Why is 40 mm solid wood better for stairs?

40 mm solid wood is better for stair treads and stringers because it provides more strength, rigidity, and long-term durability in the staircase’s most important structural parts.

That direct benefit matters in everyday use, where stairs must withstand repeated loads and remain stable over time.

40 mm solid wood at a glance

Stair component Thickness Main benefit
Treads 40 mm Stronger, more solid stepping surface
Stringers 40 mm More substantial structural support
Combined construction About 40 mm in both Better balance, stability, and durability

How 40 mm thickness supports quality stair construction

High-quality stair construction depends on more than design alone. It requires the right relationship between materials, structural support, and intended use.

40 mm solid wood supports that goal in several ways:

  1. It adds substance to the most critical stair parts.
  2. It helps the staircase feel stronger in daily use.
  3. It supports durability over time.
  4. It creates a more robust overall construction when used in both treads and stringers.

This is also a useful lens when comparing stair systems, stair materials, and construction details. If you are evaluating options, thickness is not a minor specification. It is a core performance factor.

Practical tips when evaluating a staircase

If you are choosing a staircase and want to judge quality beyond the surface finish, focus on the structural basics.

Check the thickness of key components

Ask specifically about:

These details reveal much more about structural quality than appearance alone.

Look at the staircase as a system

Do not evaluate the treads without considering the stringers, or the stringers without considering the treads. A staircase performs best when the structural elements are built to work together.

Think beyond aesthetics

Wood tone, style, and finish matter, but they should not overshadow structural fundamentals. A staircase is a daily-use element, so strength and durability deserve equal attention.

When comparing stair options, it also makes sense to review related topics such as:

These related areas can help you make a more informed decision.

Who benefits most from 40 mm solid wood stairs?

This construction approach is especially relevant for people who want:

In short, 40 mm solid wood appeals to anyone who sees a staircase as a permanent structural feature rather than a purely decorative addition.

Conclusion: Why thicker really is stronger

In stair construction, thickness is not just a specification on paper. It affects how the staircase performs, how it feels to use, and how well it holds up over time.

That is the value of 40 mm solid wood in stair treads and stringers. The treads benefit from a stronger stepping surface. The stringers benefit from a more substantial support structure. Together, they create a staircase with greater strength, stability, and durability.

If you are comparing staircase options, pay close attention to the structure behind the design. 40 mm solid wood is a detail worth prioritizing when you want a staircase that feels solid today and stays dependable over the long term.

Ready to choose a stronger staircase?

If you are evaluating stair solutions, look closely at tread and stringer thickness before making your decision. A staircase with 40 mm solid wood in both core components offers a clear structural advantage. Explore related stair construction details and choose a build that combines durability, stability, and lasting everyday performance.