How to choose insulation for underfloor heating: choose reliable material

By Admin | Garden And Buildings / Construction And Repair
21 May 2016

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

It is not only the exclusion of energy losses and rational distribution of the heat, well-chosen insulation for underfloor heating will significantly reduce energy consumption.


functions and specific insulation ↑

Construction insulation under the system "warm floor" will allow efficient use of the resulting thermal energy not for heating of concrete structures, and directly on the floor heating.Selection of an electrically insulating material and the choice of technology is due to warming and sea floor, especially the room where it will be laid floor heating.The substrate is made of extruded polystyrene, mineral wool or foam is u

sed for thermal insulation of the balcony slab floor on the first floor, the thickness of the insulating layer should be in such a case is not less than 50mm.If the floor is over heated room, the thickness of the insulation shall not be less than 20mm.

The amount of heat depends on the thickness of the insulation
dependence of the heat flux up to the thickness of the insulation

insulation laid on free of dust and debris, 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 insulating material used for underfloor heated room at the bottom, usually a half to two times thinner used for arrangement of floor heating on the ground floor.Consider the basic requirements for thermal insulation under the floor heating.

Besides 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 device is an electric floor heating floor heating
Diagram of the electric floor heating

cooker extruded polystyrene except dense structure, moisture resistance, resistance to mold and mildew inherent durability and low thermal conductivity that the combined properties would call it ideal for arranging insulation if it were notability to excrete toxic substances during combustion.Furthermore, the material is breathable, that is necessary in the case of thermal insulation of the wooden floor.

isolation working in the "warm floors» ↑

Styrofoam and heating systems ↑

The most common insulation used for underfloor heating panels or slabs of expanded polystyrene or basalt fiber.EPS boards with a thickness up to 30 mm, divided into sections 1000h166h30 mm connected multilayer foiled canvas with mounting layout.Floor consists of foam sheets, 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 resistance characteristic of the sexes to various microorganisms, which prevents the possibility of bacterial decay.When heated polystyrene foam insulation does not emit harmful substances.

thin (5-10 mm) of insulating material with a coating of foil used in the case where a thick insulating layer stacking impossible.To avoid heat loss through the walls necessarily use the damper tape.

cork insulation under the floor heating ↑

Roll insulation cork
cork insulation has excellent technical qualities, but the activity using "slow" not everyone affordable price

parts manufacturers systems "warm floor" as an insulating material is recommended to use a sheet jams.Firstly, thanks to its natural insulating properties of cork: even if the layer thickness of 2mm, effectively retains heat, which will significantly save on electricity consumption.

When pouring concrete cork layer is not deformed, nor changes its volume in a temperature difference.The material is eco-friendly, does not rot and does not burn.The main drawback of this material is its high cost.

foiled polyethylene foam insulation ↑

Represents foil foam.This web material is inferior in thermal conductivity of the plug.Polyethylene, being a poor thermal insulator still appropriate in the composition penofol insulating material because of its ability to form a structure with 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 significantly.

Foiled polyethylene foam insulation
inadmissible direct contact without styrofoam foil laminating coating with heating cables and electrical systems with screed

Foil layer - always lamination!

lamination layer of thermal insulation is necessary to avoid contact grout sealant, because the solution of cement 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 may 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.

Video: The device of warm floors insulated ↑

arrangement for insulation can be used expanded clay, foam, fomisol, folgoizolon etc.Non monolithic material required compulsory cover additional layer of screed, possibly additional use penofol.Use of the foam sheet is not always acceptable (floor level then rises at 5 cm).