Gypsum is one of the oldest known building materials. It is used in all living areas. The attic and the basement are also often plastered with plaster. Not every cellar is suitable for the popular gypsum plaster.
It depends on the cellar
Basement walls that are to be plastered with gypsum must be dry, dust-free and frost-proof. From the outside, the basement must always be sealed against moisture. These prerequisites are rarely met, especially in older properties. Alternatives to gypsum plaster are recommended here. Gypsum plaster with increased strength is available for areas in the basement that are at risk of moisture. It contains a special primer. No further primer has to be applied to this damp-proof plaster before, for example, tiles are processed.
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In pure storage rooms in the basement, there is moderate humidity when the basement walls are generally dry. Nothing speaks against a gypsum plaster here. If the basement is used as a laundry room and drying room for laundry, caution is advised. Gypsum plaster must be able to dry sufficiently between exposure to moisture. When the washing and drying room is used up, as is normal and commonplace for families with several people, the permanently high humidity damages the gypsum plaster.
Basement in older properties
When taking over a used property with existing gypsum plaster on the basement walls, you should check the condition of the gypsum plaster for any moisture damage. If you discover efflorescence and swollen areas, the humidity in the cellar is too high. Depending on the year of construction and the type of property, this can be an average humidity typical for the building. Local water damage may also be the cause of the damage to the gypsum plaster. In these cases, you should remove the moisture-damaged plaster and replace it with a plaster that is more resistant to moisture.
If you discover fundamental moisture damage to the basement, the first step is usually a thorough renovation of the basement, including external sealing. After completion of the renovation work and if the basement is sufficiently and permanently dry, gypsum plaster can be considered for the walls.Tips & Tricks You should generally choose other types of plaster for basements threatened by moisture, as moisture damages the plaster. Gypsum plaster in the basement is only suitable for dry basement rooms that are not at risk from moisture. Ask your specialist dealer about damp-proof plaster. It is available on a gypsum plaster basis.