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CROSS Safety Report

Design of timber structures

Report ID: 17 Published: 1 November 2005 Region: CROSS-UK

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An approximate design led to a timber roof deflecting considerably.

Key Learning Outcomes

For civil and structural design engineers:

  • This report demonstrates the importance of design calculations being checked by a competent and experienced engineer

  • It is important to recognise and know the boundaries of your expertise and work within the limits of your competence

Full Report

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This section contains the Full Report submitted to CROSS and describes the reporter’s concerns or experiences. However, the text has been edited for clarity, and identifiable details have been removed to ensure anonymity and confidentiality. If you would like to know more about our secure reporting process, or submit a report yourself, please visit the reporting to CROSS-UK page.


On the subject of timber, an engineer was reported to have applied an approximate design to an ‘A’ frame hall roof. This did not take account of the local bending and as a result the roof deflected so much that the structure was near to collapse in dead load state.

Expert Panel Comments

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Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.

CROSS has already commented on the lack of skill evidenced on some timber designs and this must be addressed

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