Is gypsum plaster usable outdoors?

Gypsum plaster has many good properties. Thanks to its mineral components, it does not provide any food for mold, ensures a healthy indoor climate, is versatile and keeps costs manageable. It cannot be installed outdoors.

Plaster does not belong outdoors

Plaster of paris absorbs water. If the plaster of paris cannot release the water again and dry out, it becomes soft and unstable. Gypsum plaster on the facade would be permanently exposed to the weather with rain and snow. A plaster based plaster cannot withstand these loads. In the long run, the gypsum plaster becomes porous and cracked under these conditions, and water can penetrate into the facade. You would no longer be protected. The consequences of this can be moisture damage and mold formation in the masonry of the facade.
Plaster of paris is not frost-resistant. A soaked gypsum plaster bursts in frost. The water it binds expands at sub-zero temperatures and breaks the gypsum plaster.

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The better choice for your exterior facade

You can find a robust facade plaster in cement and cement-lime plasters. They are very resistant and resilient. They are considered waterproof and frost-proof. Synthetic resin plasters are particularly weather-resistant. Hail and driving rain do not affect this plaster either. It is used, among other things, on thermal composite systems as a thermal insulation plaster. Facades facing north are particularly exposed to moisture. They are well protected by silicone resin plasters, which thanks to their high water resistance prevent the formation of moss and algae. Silicate plasters are also weatherproof and resilient. They are available in many different colors and are often used in the renovation of historical facades. The selection of facade plasters is large. The right plaster must match the building and the climatic conditions in the area.

Tips & Tricks Gypsum is an ideal building material for living areas: it is easy to plaster and does not get moldy. It is difficult to ignite and therefore provides a certain level of fire protection. Gypsum plaster contributes to good thermal insulation and noise protection.