/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Psychological/2.1.6 Adding or increasing internal insulation in roofs

2.1.6 Adding or increasing internal insulation in roofs

2.1.6 Adding or increasing internal insulation in roofs


The insulation from the inside is achieved by insulating the roof of the building or the ceiling of the upper housing in case it is a multi-family building. It is a simple execution and it allows the use of thermal insulation materials of lower quality and lower cost than in the external insulation.


  • Prevent the lifting of the external roof (tiles or pavement), waterproofing, etc.

  • It enables the retrofitting from the aesthetic point of view of the inside of the building

  • Especially suitable when it is not necessary to carry out works of waterproofing or modification of the external roof of the building

  • It is especially suitable to insulate on the inside when the buildings are not of permanent occupation. It is the typical case of a weekend house

  • In the case of buildings with a degree of protection as part of the historical and artistic heritage, working on the inside will be the only option to execute the work of retrofitting.


  • The thermal insulation is out of the building envelope corresponding to the roof

  • There is no elimination of thermal bridges

  • Interstitial and superficial condensation of each construction should be checked individually and decide, case by case, the installation of a vapour barrier

Economic assessment

Initial investment: around 15 €/m2

Payback: around 2 years

References and best practices

Image gallery


Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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