How long does gypsum plaster have to dry?

The most common mistakes in the processing of gypsum plaster include wrong measures in the dry phase. Gypsum needs sufficient time and good ventilation. If the surface is perfect, the gypsum plaster dries flawlessly.

Gypsum must tighten before smoothing

The gypsum plaster that has just been put on the wall must be lightly applied before it can be smoothed. Inexperienced do-it-yourselfers can use simple tricks to determine whether the gypsum plaster is ready for further processing:

  • Try to lightly press in the plaster with your finger. If that fails, the plaster has already stiffened sufficiently. He dont.
  • When rubbing the plaster, no cavities or depressions are formed. This too is a sign for putting on the plaster.
  • Do not wait too long with the smoothing. If the plaster smears when smoothing, it has already become too dry.

Gypsum plaster dries faster than others

In comparison to lime plaster or lime cement plaster gypsum plaster dries significantly faster. The best conditions for fast and solid drying are low humidity and higher ambient temperatures. Plastering is therefore better in the summer months. If the conditions are favorable, gypsum plaster dries on average within 14 days with a layer thickness of ten millimeters. Damp and cool weather delays the drying accordingly. This must be taken into account in the further planning of the work. Under no circumstances should the not yet completely dried plaster be charged too soon. He does not get stuck, tears and can flake off.

Well ventilated is half dried

The high humidity during the drying time must be able to escape from the affected room. In doing so, no permanent draft should occur. The room should be well ventilated several times a day for a few minutes. If this blast ventilation is carried out consistently, the gypsum plaster has good conditions for drying. In persistent humid air gypsum plaster can not dry and become unusable. If temperatures are below five degrees, the room must be heated slightly.

Tips & Tricks

Note the dryness of the substrate. Gypsum plaster must not come in contact with fresh concrete. Both building materials form as reaction new mineral compounds, which are visible in the so-called sulphate rubbing. Gypsum plaster can only be applied to concrete when it has dried.

Artikelbild: Andrew Angelov / Shutterstock

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