Insulation of external walls from the inside
| In cases of insufficient thermal and/or acoustic insulation of external walls, insulation from the inside is an alternative solution. In such a case, insulation material must be incombustible, in accordance with the Rule Book of Technical Norms for Fire Prevention in High Buildings. This type of external wall insulation is also recommended with buildings that are used occasionally or for part of the day, because such rooms are heated (during winter) or cooled (during summer) faster in comparison with insulation from the outside. |
External wall insulation from the inside is commonly carried out in a system with a veneer base (like gypsum board) on a metal substructure (in accordance with the manufacturer’s recommendations) by using mineral wool insulation materials such as Ultracoustic P, Ultracoustic, KR SK, KR L
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Obligatory notes on installation: - Check the dampness of the existing supporting wall; if there are damp spots, they should be dried before laying the insulation and further damping of the wall should be prevented
- Vapour barrier must be placed on the warmer side of the insulation material i.e. between stone wool and final covering of the wall, e.g. veneer base.
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External wall insulation from the inside is unfavourable for the following reasons: - The wall mass that may accumulate a greater quantity of heat which it gradually returns to the room when heating ceases, remains on the “colder” side of the wall thus preventing greater energy savings
- The basic wall mass is exposed to great temperature changes of external environment which may cause various long-term damages to the wall
- Problem of non-insulated parts of the building on all joints of the wall that is being insulated with other construction elements (mezzanine structure, internal walls, openings), that form so-called “heat bridges” where condensation occurs and where moulds may grow; most frequently jeopardized spots are corners of rooms.
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