Standard bracing of 'Room in the Roof' (attic) trussed rafter roofs

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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
  • The functions of roof bracing
  • Application of standard bracing
  • Conditions of use
  • Other considerations
  • Chevron bracing
  • Roof sarking

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....

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Standard bracing of simple duopitched trussed rafter roofs for dwellingsnavigation-arrow

Trussed rafters must be braced to create a rigid and stable roof structure. If the bracing is omitted, wrongly positioned or badly fixed, it may result in distortion or failure of individual trusses or in some instances the whole roof.

This information sheet gives a summary of the standard...

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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...

14/09/2021 |  Wood Information Sheet