Repair floor

How to choose insulation for underfloor heating: choose reliable material

How to choose insulation for underfloor heating

The effectiveness of any system "warm floor" depends largely on the characteristics of the installed thermal insulation.

It is not only in the elimination of energy waste and the rational distribution of heat, well-matched thermal insulation for underfloor heating will significantly reduce energy consumption.


  • Functions and specificity insulation
  • Insulation works in the "warm floors"
    • Styrofoam and heating systems
    • Cork insulation under floor heating
    • Insulation foiled polyethylene foam

Functions and specificity insulation

Construction of thermal insulation under the "warm systemfloor "will allow efficient use of the resulting thermal energy not for heating concrete structures, but directly on the floor heating. Selection of an electrically insulating material and due to the choice of insulation technology, and a view of the flooring, and feature space, where it will be laid floor heating. Extruded polystyrene substrate, mineral wool or foam used for heat insulation of the balcony slab,floor to the first floor, the thickness of the insulating layer must be in this case at least 50 mm. If the floor is over heated room, the insulation thickness should not be less than 20mm.

The amount of heat depends on the thickness of insulation

The dependence of the thermal flow upward from the thickness of insulation

Thermal insulation is laid on free of dust andwaste concrete subfloor. If the use of floor heating as the main heating system, it is advisable to use mechanically strong insulation thickness of 50 mm, with the highest thermal insulating characteristics. The thickness of the thermal insulation material used for floors with heated room at the bottom, usually a half to two times thinner used for arrangement of floor heating on the ground floor. Let us consider the basic requirements for thermal insulation under floor heating.

In addition to the low thermal conductivity(0.03-0.05 W / m * K), minimal moisture absorption, important and good performance of elasticity and density, in order to avoid damage to the insulation under the weight of the screed and floor covering.

The unit of electric underfloor heating underfloor heating

Driving device electric underfloor heating

Plates of extruded polystyrene exceptdense structure, moisture resistance, resistance to the action of fungi and molds characterized by durability and low thermal conductivity, that the combined properties would help to call it ideal for arranging insulation if not the ability to release toxic substances during combustion. Furthermore, the material is breathable, that is necessary in the case of thermal insulation of the wooden floor.

Insulation works in the "warm floors"

Styrofoam and heating systems

The most common insulation for warmfloor panels are used or slabs of expanded polystyrene or basalt fiber. Polystyrene plates, thickness up to 30 mm, divided into sections 1000h166h30 mm, coupled with multi-layered web foiled circuit layout. Floor consists of sheets of foam, aluminum coating and protective film overlap. Important properties of polystyrene is the stability of the structure when the temperature changes, moisture resistance, high strength in combination with low density (0.015 - 0.05 g / cm 3). Polystyrene foam insulation for water resistant floors characteristic to various microorganisms, which prevents the possibility of putrefaction bacteria. Upon heating, thermal insulation of expanded polystyrene does not emit harmful substances.

Thin (5.10 mm) of insulating material withcoated foil is used when laying a thick insulating layer is not possible. In order to avoid heat loss through the walls necessarily use the damper tape.

Cork insulation under floor heating

Roll insulation cork

Cork insulation has excellent technical qualities, but active use of "slow" is not all affordable price

Manufacturers often "warm floor" systemsan insulating material is recommended to use a sheet jams. Firstly, thanks to the natural insulating properties of cork: even at a thickness of 2mm layer effectively retains heat, which will significantly save on electricity consumption.

When pouring concrete cork notIt is deformed as does not change its volume in the differential temperatures. The material is eco-friendly, does not rot and does not burn. The main drawback of this material is its high cost.

Insulation foiled polyethylene foam

It is a PE foam foil. This web material is inferior in heat transfer tube. Polyethylene, being a poor thermal insulator still appropriate thermal insulation material composed penofol structure because of its ability to form air bubbles inside. The efficiency depends on the thickness penofol. The material characteristic crush under the weight of the concrete, which leads to a decrease in the efficiency of the insulator. Compared with stopper penofol losing on this indicator considerably.

Insulation foiled polyethylene foam

Invalid direct contact foil styrofoam without coating laminating with heating cable power systems and cement screed

Foil layer - certainly lamination!

Lamination layer of thermal insulation is necessaryto avoid contact grout sealant, cement because the solution is, in fact, an aggressive environment affects the thin layer of metal (foil) destructive. The consequence of contact between the heating cable directly to the insulating material can be damage to the cable jacket due to overheating. Therefore, if the selected insulation material not laminated, it is advisable to lay on top of the foil and a polyethylene cable after mounting.

For the arrangement of the thermal insulation can beused concrete block, foam, fomisol, folgoizolon etc. Non monolithic material required compulsory cover additional tie layer may further use penofol. Use of the foam sheet is not always acceptable (floor level then rises at 5 cm).

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