The right interior insulation for the basement wall

The right interior insulation for the basement wall


Anyone who uses the cellar as a living room or hobby room should not forget the insulation of the basement wall. Attention: Internal insulation can lead to mold.

Noteworthy in interior insulation

Especially in old buildings walls and floors are often not completely dry, partly there is no protection against rising damp completely. An uninsulated wall in a well-ventilated basement usually shows no damp areas. The passing air dries the wall before moisture is a problem.

Shore owners who insulate such a basement wall prevent drying. Water collects between the insulation and the walls, mold and bacteria grow unhindered and go unnoticed for years. As the water does not evaporate, it continues to rise in the wall. Often, after years damage from moisture in the above residential units.

The basement insulation with an internal insulation, is a sensitive issue for the reasons mentioned. A consultation by an energy consultant is definitely useful. This also measures the moisture content of the wall and can initiate accompanying measures to keep the walls dry after thermal insulation.

A common mistake is that the basement insulation only occurs on the exterior walls. Logically, it is not necessary to insulate the entire ceiling and all interior walls. However, in order to prevent thermal bridges, it is necessary to insulate a strip of at least 50 centimeters wide of the adjacent inner walls and the ceiling.

Material for insulating a basement wall

Thermal insulation materials such as polystyrene or foam glass are always problematic for so-called ground-contacting components. These do not let moisture through. In addition, they must be provided with a vapor barrier on the room side, so that condensation does not form behind the insulation material.

More costly, but also much better, are calcium silicate, mineral foam or PUR panels with special capillary breakthroughs for interior wall insulation. These materials are, as the expert says, capillary active. They absorb moisture from the wall or the room and release it when the air in the room is dry. They therefore have a climate-balancing effect.

The type of thermal insulation consists of individual components that must be coordinated with each other. In order to ensure the capillary connection to the basement wall, the boards should be glued over their entire surface with a suitable adhesive. As a rule, apart from insulation boards and adhesives, basic plaster and smooth plaster are also part of the system.

In order to avoid damaging the cellar in the long term, the choice of insulating material is just as important as the careful execution of the work. Panels that do not stick to the entire surface can not extract water from walls. At these points, the masonry dries so badly. The system only works if the panels are completely connected to the wall.

Better insulate the basement by a specialist

Because of the dangers mentioned by penetrating moisture, it makes sense to have a cellar always insulated by a specialist.

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Video: How to Properly Insulate a Basement Wall: NO MOISTURE!|

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