/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Physiological, Psychological/2.1.7 Adding or increasing external insulation in floors

2.1.7 Adding or increasing external insulation in floors

2.1.7 Adding or increasing external insulation in floors


This measure consists in adding a layer of thermal insulation to floors with the goal of reducing the thermal transmittance. This measure is of interest for 1 or 2-storey buildings for enclosures that are in contact with permanent occupied spaces.


  • Provide thermal mass, particularly useful in southward facing rooms and it helps to maintain steady temperatures

  • Thickness of insulation is less restricted than for an above-slab condition

  • Avoid lack of comfort due to “cold radiation” and risk of superficial condensation caused by low surface temperature of the floor

  • Using closed pore insulation, the thermal performance will not be lost even if the insulation is wet


  • Rooms are slower to heat in comparison with an above-slab condition

  • The external thermal insulation can be made only when there is a space with sufficient height to work with comfort to install the insulation system

Economic assessment

Initial investment: between 8 and 11 €/m2

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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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