Loft conversions with trussed rafter roofs

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There is a quiet revolution going on in the housebuilding industry which impacts on many householders. Until a few years ago most house roofs were constructed with simple trussed rafters; lightweight yet robust frameworks constructed from specially selected timber joined with patented connector plates.

This Product Data Sheet has been produced specifically to warn householders of the perils of modifying trussed rafter roofs in order to provide roofspace accommodation without first seeking experienced, professional advice.


  • Fig 1: A typical arrangement of new roof members

Suggested Reading

Trussed raftersnavigation-arrow

Widely used for a range of building types, trussed rafters are an economical, versatile and straightforward solution to providing a roof over a building.

Trussed rafters are individually designed prefabricated structural components made from strength-graded timber members of the same thickness, joined together with punched metal plate connectors....

21/12/2020 |  Wood Information Sheet  

Principles of pitched roof constructionnavigation-arrow

There are a number of ways to design and construct pitched roofs using timber. Traditionally, builders constructed them on site, cutting and fitting each piece to its neighbours. Following the Second World War, various forms of prefabricated truss were developed, with the intermediate rafters and purlins cut and fitted on...

11/04/2016 |  Wood Information Sheet  

Standard bracing of 'Room in the Roof' (attic) trussed rafter roofsnavigation-arrow

This information sheet is an extrapolation of the standard bracing requirements given in BS 5268-3 extended to cover 'Room in the Roof' trussed rafters. All the information given here should be read in conjunction with the requirements of that standard.


  • Why brace trussed rafter roofs?
  • Bracing responsibility
  • ...

01/01/2007 |  Info from other organisation