At Thomas Armstrong (Timber) Ltd we design, manufacture and transport high quality bespoke floor cassettes for various physical and loadbearing requirements. We also have a proven track record, in-depth industry knowledge and extensive experience of engineered timber products (ETP). We have also worked across a diverse range of construction projects from bespoke self-build homes to large commercial construction projects across the UK.


Providing an alternative solution to traditional methods, our Timber Floor Cassettes can be manufactured with a range of joist types including solid, i-joists and metal-web/posi joists depending on the specification of the project. They are suitable for both timber frame, masonry, or steel constructions within residential, commercial, and industrial projects. All our cassettes are all manufactured under strict factory conditions, so once installed they create an instant stable working platform which continues to improve site safety.

At Thomas Armstrong (Timber) Ltd, part of the Thomas Armstrong Group, all our timber floor cassettes are custom-made to meet our clients and customer precise dimensions whilst ensuring they achieve Buildings Regulations performance requirements for fire and acoustic standards. They can be manufactured to large formats depending on the load specification.

No matter the size and complexity of your project, be assured we are always here to help you as our in-house design teams are always available to guide you through the process from start to finish to ensure they meet your specific requirements.


One key advantage is at Thomas Armstrong (Timber) Ltd, we supply all the relevant timber ancillaries’ items as standard. Depending on the timber product/s ordered, ancillaries items such as straps, hangers, timbers, truss clips, gable straps, valley gutters etc are delivered at the same time ensuring you have everything you need to complete the installation of our products on-site.



  • Suitable for a wide range of floor structures and building types
  • Prefabricated components mean reduced site labour costs
  • More thermally efficient than alternative materials
  • Manufactured off site
  • Improved site safety
  • Easy and Quick Installation
  • Easily transported and ready for installation on delivery
  • Cost effective solution
  • Flexible and versatile
  • Engineered product that provides greater level of precision and accuracy



  • Self builds
  • Housing schemes
  • Apartments
  • Student accommodation

Commercial buildings, including:

  • Schools
  • Nursing homes
  • Hospitals
  • Offices
Why choose Thomas Armstrong?

Thomas Armstrong (Timber) Ltd have been to be a leading timber roof truss manufacturer, servicing sites across the North of England and Scotland. To discover why to choose Thomas Armstrong (Timber) Ltd then click here for more information.

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Other Products Available

At Thomas Armstrong (Timber) Ltd, we provide a range of timber products to support you with your build project including:

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Supporting you with your build project
Thomas Armstrong (Timber) Ltd is part of the Thomas Armstrong Group, as we can provide a ‘one stop’ service as we have the skills, capabilities and knowledge to help support you with your entire build project. Other services of interest include: