/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Physiological, Psychological/2.1.8 Adding or increasing internal insulation in floors

2.1.8 Adding or increasing internal insulation in floors

2.1.8 Adding or increasing internal insulation in floors


This measure consists in adding a layer of thermal insulation to the internal face of the floors with the goal of reducing the thermal transmittance. This measure is of interest for 1 or 2-storey buildings. It is a simple implementation work and it is interesting when it is necessary to replace the floor in the conditioned lower floor.


  • Insulation above the slab increases the heating response time

  • Temperatures will increase more quickly when the heating system is switched on in comparison with below slab insulation

  • In the case of a radiant floor heating installation, the insulation including the system tends to be sufficient


  • The effect of temperature regulation by thermal mass is unavailable

  • Point loading requires careful specification of the floor finish where it bears on a smaller area of insulation beneath

  • When in conjunction with timber-based flooring it is not advisable for use in ‘wet’ rooms such as kitchens and bathrooms

  • The internal insulation will necessarily produce a rise in the level of the floor in about 7 to 10 cm, which must be taken into account especially for accessibility to the building.

Economic assessment

Initial investment: around 10 €/m2

References and best practices

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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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