King Post Roof Trusses

The Kingpost truss is what we at Minera Roof Trusses would call our most simple type of prefabricated truss. Kingpost trusses are easily defined by their single timber upright lining from the centre of the bottom chord up to the top of the apex which is formed by the two joining rafters.

Despite their simple structure, Kingpost prefabricated trusses can be used for a variety of purposes. Their suitability to span up to 4 metres makes Kingpost trusses a favourite for use in the construction of small house extensions, garages, garden sheds and dormer windows.

Kingpost trusses are available in both 35mm and 46mm thickness of TR26 stress graded timber. A full list of timber sizes and associated rafter depths that we supply can be found in the Roof Trusses section of our website. Depending on the weight loading requirement of your Kingpost truss, the associated rafter depth may be 72mm or 84mm.

Timber Sizes Available:

  • 35mm x 72mm
  • 35mm x 84mm
  • 35mm x 97mm
  • 35mm x 122mm
  • 35mm x 147mm


  • 46mm x 72mm
  • 46mm x 97mm
  • 46mm x 122mm
  • 46mm x 147mm
  • 46mm x 172mm
  • 46mm x 197mm
  • 46mm x 222mm

The space between the upright and the rafters on a Kingpost truss make them ideal for facilitating storage areas. Many customers wish to make the most of this structure, particularly in the case of garages and on request, we can increase the timber sizes of the truss to allow for additional weight loading.

Please be assured that our designers will always take the time to understand the requirements of your project and will advise which truss solution may give you best possible outcome which maintains feasibility and is economic.

Equally, should you require a truss that is able to span more than 4 metres then please look at our Roof Truss Types page where we give you a brief overview of the various types of trusses that we can manufacture in-house for you. Our truss types can loosely be categorized by the spans that they’re able to achieve or the desired headroom height that you require.

Whilst Kingpost trusses provide a simple and effective solution to prefabricated roofs, they can be amended to suit your build. For instance, below is an image of a series of eight trusses we supplied for a small extension in Stockton spanning 2640mm. In order to match in with the existing roof height, our designer, Jon, added a stub end detail to the Kingpost to raise the vertical heel height of the truss.


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