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We are the UK's largest and longest established manufacturer and supplier of engineered wood products, with eight branches across the UK and over 30 years of experience.

Largest Independent Timber Engineering Company In The UK

I-Joists- Donaldson Timber Engineering


imageDTE is the UK's leading supplier of timber I-Joists. Located in the UK with eight regional branches we are able to provide a total national coverage along with local knowledge and service. We take you through the complete process including design, manufacture and delivery along with providing any after-sales support that you may require.

I-Joists are structurally engineered timber joists, which combine Kerto LVL with an engineered composite panel[OSB(4)], making them light weight but very strong– they can carry far heavier loads than a conventional timber joist of its equivalent weight.

I-Joists are constructed from a web which is sandwiched between two flanges, on top and on the bottom. These are assembled glued, pressed and heat cured. This produces an I shaped cross section which gives the I-Joist its name. Applications include floor and roof joists, wall studs and roof rafters in both residential and commercial construction.

DTE I-Joists are available in long lengths of up to 14 metres, and are ideal for most residential floors and flat roofs. They use 50% less raw material than comparable sawn timber, which makes them the most cost effective solution for residential floors.

DTE delivers I-Joists to your site cut to size, in precise component packages. They are supplied along with all associated metalwork and timber ancillary materials, including metal connectors, temporary bracing, chipboard decking and any additional timbers.


If you have any further questions, please get in touch.

Our Latest Brochure

Please download DTE’s
latest brochure.

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Advantages of I-Joists

  • They combine high strength and light weight
  • Extremely quick and easy to install
  • Cost effective
  • Does not distort (bow, cup, twist)
  • Does not split
  • Structural and dimensional stability
  • Virtually no shrinkage eliminating squeaky floors
  • Environmentally sustainable


SafeStep is an award-winning scaffolding system for improving safety on-site, designed to minimise risk when fixing ridge bracing on tall roof trusses.

Find out more >

Complete Solutions for Floors
and Flat Roofs brochure

Please download DTE’s Complete Solutions for Floors and Flat Roofs brochure for further details.

Download PDF

Recent Projects

Specialised roof packages for housing development

Work Included:Work Included: DTE worked with Barratt Homes on a large housing development in Surrey, providing a specialised full roof package for a block of flats and 110 houses.

Roof system for renovation of listed building

Work Included: The DTE Ilkeston team was required to supply a massive 20,000 roof trusses for 625 forest lodges within a rapid build programme.

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Head Office

Donaldson Timber Engineering Ltd
Muiredge Industrial Estate


01592 715026


01592 714007



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