Thermal insulation for roofs, walls and floors

Thermal insulation for roofs, walls and floors

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Thermal insulation for roofs, walls and floors. Which are the best? Technical information to choose the best thermal insulation for roof, wall and attic.

They exist on the marketthermal insulatorsnatural or of chemical origin. Thermal insulators are suitable for different applications:

  • in cavities
  • on horizontal surfaces
  • on vertical surfaces
  • on sloping surfaces

THEheat-insulating materialsthey can come in different forms, from single panels to rolls, from multi-structures to filling materials. There is no shortage of thermal insulation products on the market that combine different materials in order to ensure greater thermal comfort.

The characteristic to observe in an insulating material is the thermal conductivity, that is the ability to transfer heat from a colder part to a warmer one. The lower the thermal conductivity, the higher the energy performance of the material in question. To learn more about the topic of insulating materials, we invite you to read our pages:

  • Best thermal insulator
  • Mineral thermal insulators
  • Natural thermal insulation

Here is a list of the best thermal insulation for roofs, walls and floors, for each material we will indicate thethermal conductivity. Thermal conductivity is measured inW / mK, that is, in watts per Kelvin meter. We remind you that the lower this value is, the higher the thermal performance of the material will be.

Warning!Thermal conductivity is a property that can change over time. It is important, at the time of purchase, to inquire about the guarantee offered by the manufacturer because there are materials that offer thermal insulation only for 10 - 30 years, after which they gradually lose their insulating capacity.


The airgel in the form of insulating plates is a very efficient solution for the thermal insulation of all building components (walls, roof, floors ...) because it has a thermal conductivity index between 0.005 and 0.015 W / mK.

Autoclaved aerated concrete

It is an inorganic material obtained by mixing quartz sand and gypsum with cement, water and aluminum. In green building it is used in blocks that have a thermal conductivity of about 0.040 W / mK.

Hemp fiber

It has a thermal conductivity ranging from 0.035 to 0.043 W / mK. More powerful insulators see the union of hemp fiber with polyester or other insulators of artificial origin.

Wood fiber

It is highly insulating especially when combined with cork panels. Wood fiber, useful for insulating roofs, floors and walls, although it is a natural insulating material, is often combined with glues and bitumen which, combined together, form insulating panels. It has a thermal conductivity of 0.038 to 0.048 W / mK.

Rock wool

Rock wool is one of the best acoustic insulators as well as insulating materials of mineral origin with excellent thermal conductivity. For the insulation of the roof or sloping surfaces it is used in the form of rolls or felts. Rock wool panels are used to insulate the walls. Conductivity ranges from 0.030 to 0.045 W / mK.


Don't be fooled by the name, glass wool is a synthetic material made from quartz sand, resins and other components. It is marketed in the form of rolls, felts and panels. Its thermal conductivity ranges from 0.030 to 0.048 W / mK.

Expanded perlite

Used mainly for the insulation of roofs, floors and for filling cavities. It is composed of silica and oxides of aluminum, iron, sodium, potassium, calcium and magnesium. It has a grain size of 2/5 mm. Its thermal conductivity fluctuates between 0.043 and 0.052 W / mk.

Extruded expanded polystyrene

Also known as XPS, extruded polystyrene foam is a fairly durable inorganic insulation material. Guarantees good thermal insulation for 30 - 40 years. Its thermal conductivity is 0.030 - 0.040. It is slightly more efficient than synthesized expanded polystyrene (ESP).

Video: How to Insulate a Flat Roof, Floor, Stud Walls u0026 Calculating U Values (August 2022).