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               The Sustainable Way to Build

       Trussed Rafters

The examples given below help identify the most common trussed rafter shapes, it gives only a selection of our most common trusses available wherever you are building in the UK.

Attic Trusses   Queen Post    Raised Tie  Bob Tail    Cantilever   Double W   Fan   Fink   Flat Top   Howe   Mono   Parallel   Scissor  


Timber Trussed Rafters ...
... and Truss-Rafter engineering were first introduced to the UK in 1964.  Since then they have proved to be an efficient, safe and economical method for supporting roofs.  Manufactured by specialised timber engineering companies, like BATT, timberframe truss-rafters are supplied to all sections of the construction industry. Developments have been extensive, and today complex roofscapes of, for example, attic-truss timber-structures and roofs with wood-composite beams or bolted-timber rooftrusses, are easily formed with computer designed trussed rafters.

As experience roof designers and trussed rafter manufacturers we are in an ideal position to assist architects and specifiers throughout the building industry to achieve affordable solutions for their designs - no matter how unusual, advanced, or difficult - including trussed-rafter timber-erection

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 specialist to visit and advise you  

Timber Rafters Attic Trusses make best use of loft space
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.   

Attic Trusses          


Our rooftrusses address all roofing requirements across the uk and our roof designs embrace cut rafters as well as trusses, or trussed rafters, for attics and lofts, including conversions.  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. 


In practice all roofs and trusses are individually designed, engineered and manufactured by us - often in conjunction with a timber frame for your construction - to give you the strongest possible timber structure design at the most cost effective price. However unusual, however specialist, however difficult your requirements for roof rafters are, contact us with details for a no obligation consultation.


         Queen Post

We use kiln dried lumber, kerto, glulams and other wood composites for specialist and unique construction projects throughout the UK.

Raised Tie Truss       

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

      Bob Tail Trusses

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  

Cantilever Trusses     

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

    Double 'W' Trusses

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.

   Fan Trusses          

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
        Fink Trusses

Kiln dried, stress graded timber is used in all our trusses to comply with current European & British Standards

Flat Top Trusses       

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.

       Howe Trusses

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.

King Post Trusses     

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

Mono Trusses  

 Mono Trusses

Where spliced timber joints are required we use Wolf 125 - 1.25 mm galvanised steel nailpates.  Where construction requires heavier timbers, we import and use use 1.5 mm guage nailplates with longer teeth from Austria.  

These heavier gauge nailplates are supplied in predetermined sizes.  Wolf 15N are galvanised; Wolf 15NE are stainless steel for specific applications only. 


      Parallel Trusses


Technical Manual

For more detailed information about our Timber Rafter options, please fill in the enquiry form and request a Technical Manual   

Scissor Trusses        


Quality Control

Benfield ATT monitors and controls the quality of all products and manufacturing processes in accordance with ISO 9001  


Wherever you are ... Whatever you need ....

'Better Build Benfield'

"... the sustainable way to build ..."

United Kingdom Accreditation Service, certifying your timber frame project is manufactured and erected to reliable and quality ISO 9001:2000 procedures SGS - Society General de Surveillance ensures that quality systems and procedures are used in the design, manufacture and erection of your engineered timberframe structure is of the highest standard FSC - Forest Stewardship Council - FSC Timber Frame certification. Benfield ATT hold Chain of Custody certification for the Design, Sales, Manufacture & Distribution of Engineered Timber Structures – FSC endorsed by Greenpeace, Friends of the Earth and WWF and EcoHomes Investors in People, Benfield ATT are one of a few timber frame companies to hold an award for the training and ongoing development of their people and service

Chartered Building Consultancy - timber frame, OSM (off-site manufacture) and engineered timber structure advisors. Timber Research and Development Association – our work with TRADA ensures high quality, eco-friendly engineered Timber Frame build projects. The Green Register of Construction Professionals - Benfield ATT's membership demonstrates our passion for environmentally sustainable timber frame self-builds, new homes, schools and social housing for local housing authorities AECB - Association of Environment Conscious Building – our FSC certified timber frame is endorsed by The Ecology Building Society Impact Upon Society Big Tick Award from Business in the Community – BITC – award-winning timber frame company within the Timber-frame industry TRA - Trussed Rafter Association – our membership assures Timberframe Trusses, Trussed Rafters, roofs and complex and innovative roofscapes are quality HBF - the only developer partnering timber frame company to be members of the House Builders Federation. Wales Quality Centre – members and committee members, we ensure the highest quality, especially when coupled with ISO 9001, FSC certification and Q-Mark Plus standards RICS - Royal Institute of Chartered Surveyors, assures our customers of our professionalism in wood and timber frame building and developing and surveying

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