In the UK, timber designated for critical roles is subject to rigorous grading, with common classifications including C16, C24, and TR26. In this article, we explain the strength, characteristics and applications of TR26 timber, which is found in the production of roof trusses and the flanges of open web joists.

Timber Grading

To understand TR26 timber, we must first appreciate the process of timber grading. Timber is sorted into groups based on commonalities in appearance or structural properties and it’s important to grasp the terms used during this grading process, as they signify key characteristics and qualities associated with each grade.

The sorting process differentiates between appearance and structural grading, treating them separately due to instances where timber exhibits both sets of characteristics. Grading involves a series of essential tests:

  • Appearance Grading: This assesses the visual attributes of timber, considering factors like knots, splits, and grain patterns.
  • Structural Grading: This focuses on the timber’s inherent structural properties, determining its suitability for load-bearing applications.
  • Visual Stress Grading: A visual examination of timber to identify stress-related defects.
  • Machine Stress Grading: This involves mechanical testing to evaluate timber’s stress-carrying capacity.
  • Machine Proof Grading: Similar to machine stress grading but with higher precision and stringent criteria.
  • In-Grade Testing: A testing phase where timber is examined to ensure it meets specific grade requirements.
  • Stress Grades: Timber is assigned stress grades based on its load-bearing capabilities.
  • Quality Control: Stringent quality control measures are in place to maintain the integrity of graded timber.

The Purpose of Timber Grading

Why go through the process of grading timber? The answer is simple: to ensure it’s fit for its intended purpose. Timber may undergo testing to guarantee structural safety and economical use of the material. Grading also provides the means to identify and reject lower-quality timber, thus improving the overall quality of the timber that makes the cut.

Machine grading, for instance, involves a critical test assessing the deflection of timber under applied pressure. If the material passes this test, it receives a grade stamp, enabling both manufacturers and users to identify it. Visual grading, too, employs stamps to convey the timber’s quality.

TR26 Timber: Characteristics and Significance

TR26 is classified as a sustainable source of timber, adhering to the standards set by BS EN 14081. 

Key characteristics of TR26 timber include:

  • Kiln-Dried: TR26 timber undergoes kiln drying, which not only protects against decay but also enhances the product’s stability.
  • Planed All Round: The timber is machined to achieve square edges, providing a regular, consistent section size.
  • Lightweight, High Strength: Despite its relatively lighter weight, TR26 timber doesn’t compromise on strength, making it a suitable choice for load-bearing applications.
  • Dimensional Stability: TR26 timber maintains its dimensions over time, enhancing the reliability of the structures it supports

Environmental Responsibility: A Key Commitment

At Nuneaton Roof Truss, sustainability and environmental responsibility are priorities. All timber used, including TR26, adheres to the PEFC and FSC certification schemes, confirming its eco-friendly origins and responsible sourcing. Additionally, the manufacturing process boasts a low carbon footprint, as timber requires less energy to produce compared to other construction materials.

Timber’s potential for reuse and recycling at the end of its life also contributes to our sustainability objectives. By producing trusses off-site, Nuneaton Roof Truss minimises waste typically generated during on-site manufacturing, contributing to a cleaner, greener construction process.

Conclusion: TR26 Timber – Where Strength Meets Sustainability

TR26 timber, with its strength, dimensional stability, and eco-friendly credentials, is the ideal choice for load-bearing applications in the housebuilding industry. Its role in the production of roof trusses and open web joist flanges is significant. 

To learn more about our TR26 timber products get in touch with us

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