Guidance overview: Retrofit internal wall insulation: best practice

Guidance for designers, surveyors, project managers and installers about retrofit internal wall insulation.



This guide can be used to assess:

  • viability of internal wall insulation or systems
  • the design of internal wall insulation
  • the selection of materials including hygrothermal aspects

It also provides information on best practice for internal wall insulation.

The guide is recommended reading for any parties undertaking internal wall insulation. Some sections have been written specifically for the retrofit assessor or surveyor, the retrofit designer or the retrofit installer.

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

Published 13 September 2021