• Benfield ATT Group
  • Fast Frame
  • Simply Self Build
  • Simply Build Extensions
  • TimberTecs
  • Beamlock
  • Home & Garden
  • Woodhouse
  • SolidLox

Roof Trusses

Our Roof Designers have a wealth of experience, complimented by our structural engineers and specialist trussed rafter manufacturing facility.

Your Roof Trusses

Simply provide us with a brief sketch or description of what is being considered, including alternatives, and we will do the rest. The whole roof is designed and specified using state-of -art computer aided technology supplied by Wolf Systems. We can also arrange for one of our specialists to visit and advise you.


Benfield ATT Trussed Rafters with UK-Wide Delivery

Timber Rafters

Benfield Advanced Timber Technologies design, manufacture and erect

  • structural timber engineered trussed rafters
  • roof trusses
  • bolted trusses
  • loft attic trusses
  • roof beams
  • and a range of specialist engineered timber components for all types of building.

We use the most technologically advanced materials in the construction of our timber roof structure designs. These include

  • kerto
  • glulams
  • and other timber composites

to deliver the strongest, most effective timber engineered structure at the most economical manner.

Truss & Roof Design

We design all our trussed rafters in accordance with BS 5268: Part 3, the current recognised Code of Practice, and the relevant Building Regulations. All our roof trusses are manufactured in accordance with BSEN 1059.

Trussed Rafter Spans

Using 35mm timber our standard rafters can be designed up to 11 metres span, and 15 metres in 47mm timber. Spans in excess of these can be designed but are often supplied as multiple rafters fixed together.


It is more economical to standardise the range of pitches between 15 and 40 degrees, however, trusses may be supplied outside this range. Care should be taken when specifying because deflection problems may arise with such things as very shallow pitches

Eaves Overhangs

We can supply any overhang to suit the customer's requirements, although it should be noted that very large overhangs may cause the rafters to be uneconomical.

Truss Spacing

Trussed rafters are usually spaced at 600 mm to take advantage of the greater economies they offer, but where heavier loads need to be supported they are often positioned at 400 mm and 450 mm

Timber Truss Preservation

While Copper Chrome and similar treatments are not recommended for use with truss rafters, one of the non-corrosive spirit based organic solvents, or the new waterborne solutions may be used as a treatment if required.

Nail Plates

We are proud to be a specialist Wolf truss nail plate user and recommends Wolf 100 nailpplates. These are precision punched 1mm gauge metal plates with integral teeth, manufactured from structural grade galvanised mild steel to BS 10147 Fe E 220 G275.

These nail plates carry a 60 year performance warranty, covered by British Agrément Certificate No 89 / 2290.

Trussed Rafter Manufacture Quality Control

Benfield ATT monitors and controls the quality of all products and manufacturing processes in accordance with ISO 9001:2000 Quality Management System for Design, Engineering, Manufacture & Erection, direct from the Truss Manufacturers and Suppliers - nationally!

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Instant Estimates Information Centre

Get inspiration for your own Timber Frame Designs by browsing our Galleries below

Design Centre