Timber in joinery

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Joinery is the non-structural use of wood and includes windows, doors, cladding boards, skirting boards, door linings, staircases and architraves. It also includes decking components such as decking boards, handrails and banisters, as well as less common items such as timber fins for solar shading. Joinery is known as ‘internal’ for applications inside a building and ‘external’ when situated outdoors.


This Wood Information Sheet (WIS) introduces a number of concepts important to joinery including the related British Standards and the importance of specifying timber which has been supplied and stored at the correct moisture level and installed in conditions which will maintain it at the correct level.



  • Introduction to BS EN 942
  • Measurement of dimensions
  • Moisture content
  • Specifying timber in joinery
  • Timber species
  • Natural durability and wood preservation


This Wood Information Sheet has been reviewed and revised with minor amendments in May 2020. These include reorganisation to ensure the Annexes of BS EN 942 are covered in order, and some improvements to the preciseness of advice. The Reference section has also been updated to reflect the most recent versions of publications.


For queries about this technical document, please get in touch with its authors via BM TRADA’s Technical Helpline on +44 (0)1494 569601 or email timberadvice@bmtrada.com.


A paper/digital copy of this Wood Information Sheet is available in the BM TRADA Bookshop, which also hosts additional specialist timber publications.

Suggested Reading

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External wood claddingnavigation-arrow

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