What are sarking boards?

Kooltherm K7 with sarking boards

And why would you use them?

Sarking boards are softwood boards, generally about 150 mm wide, that are attached to the rafters of a pitched roof to give extra strength to the overall structure of a building.

They needn’t be used in every application, and instead their use largely depends on where in the country you are based, and what type of construction you are building.

Firstly, sarking boards are typically used on buildings that are exposed to extreme weather conditions, such as high wind or torrential rain. This means that they aren’t very common in England or Wales, but are prevalent in Scotland due to weather variations and Scottish building regulations.

Secondly, sarking boards are only really specified for new build constructions, and not refurbishments. This is because when we refurbish our attic space we tend simply to install insulation between and beneath the rafters. An entire re-roofing process would need to take place to add sarking boards, where any roof tiles or slates would need to be removed and then replaced over the top..

So, now that we’ve established where – more often than not, Scotland – and when – during new build or re-roofing projects – you need to use sarking boards, let’s take a look at a typical roof build up.

From the bottom, up:

Note that if you choose to use tiles instead of slates, this will require the use of counter battens and tiling battens over the breathable membrane to allow for water drainage and attachment of the tiles. Find out more about why we use counter battens here.

For more information on the use of sarking boards, please see the Kingspan Kooltherm K7 Pitched Roof Board product literature.

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Kingspan Insulation is a market leading manufacturer of optimum, premium and high performance rigid insulation products and insulated systems for building fabric and building services applications.

0 comments on “What are sarking boards?
  1. Would you recommend that sarking boards should be used in a new build roof in a tall house on top of a hill in England where the occupants plan to use the north-facing attic space as a habitable room or would standard warm roof insulation be sufficient?

    • Hi Melanie

      Your local building authority would be best to consult on this question. They will be able stipulate the requirements for your specific area. If they say that sarking boards must be used, please contact us again so that we can specify a suitable insulation system.

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