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Guidance: Insulating suspended timber floors: best practice

This guidance is for surveyors and installers who are considering the suitability of timber floors to receive retrofit insulation safely and effectively. It applies to:

  • suspended timber floors located above an unheated space, where the insulation is installed below the floorboards or timber decking
  • timber floors situated above an unheated integral garage, unheated storeroom or an unheated basement

The guidance is relevant to all installations of this type, regardless of whether it is being delivered under a government scheme.