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External wall insulation system (EWIS) - a thermally insulated, protective, decorative exterior cladding system which consist of:
- foamed polystyrene
- mineral wool
- polyurethane foam
- mineral or synthetic plaste
Thermal insulation thickness is at least 10-15 cm, because only then can partition with heat transmission factor U=0,25-o,3 W/m2K be obtained. And only than when we will use to insulate polystyrene, mineral wool, cellulose fibre, pearlite, polyurethane foam etc. that is materials with λ≤0,05 W/mK heat transmission factor.
Application of a very good thermal insulation 5 cm thick, will not achieve the increase of the wall insulating power to the valid level. It means that in layer walls with constant air void (usually 3-6 cm thick ), filling the void with insulation material will not improve partition features enough.
Besides, you should remember that in many houses elements like concrete beams or lintels are huge thermal bridges with much worse insulation factors than the wall. Because of that old houses should not be insulated with less than 12 cm thick thermal insulation.
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