How self-leveling cement works

Cement plaster - processing instructions and advantages and disadvantages

Cement plaster can be used both as a base and finish plaster as well as an exterior plaster (here on single-layer masonry or on rough-formed concrete). At the same time, the building material is fed to other plasters, such as lime-cement plasters. The latter is suitable, for example, for use in the kitchen, bathroom or other rooms that can be exposed to greater moisture.

Cement itself consists of calcium silicate, aluminum and iron compounds, and sulfates, among other things. The ancient Romans already used cement to erect their buildings; the building material was used, for example, in the construction of the Pantheon in Rome, which was built between 118 and 125 AD and has been used as a church since the 7th century.

Cement plaster - Current recommendations from the Amazon range

Cement mortars belong to mortar group III. In recent years, less and less cement mortar has been used, and many construction companies have opted for Group II mortars. The Energy Saving Ordinance also promotes this tendency, as it sets higher physical and technical requirements that can be achieved more easily by lightweight and thermal insulation plasters.

The essential components of the cement plaster include the cement as a binding agent and, in some cases, lime, the aggregate and, under certain circumstances, other manufacturer-dependent additives and additives.

Cement plasters are very pressure-resistant and have a moisture-regulating effect. The surface of the plaster is very hard and resilient, but tensions in the masonry are more difficult to cushion, which is why cracks or flaking can occur more quickly. Cement plasters are suitable, among other things, for exterior basement wall plaster, plinth areas and for surfaces that have to withstand high mechanical loads.

Advantages and disadvantages of cement plaster

Cement plaster is still one of the most widely used types of plaster and has been in use for many centuries. Its greatest advantage is its universal applicability. The dry construction material is mixed with water and releases it back into the environment during the hardening phase. Fresh mortar must be thoroughly stirred again before application.

Walls plastered with cement can withstand great loads, but are generally quite rigid and can hardly compensate for tensions in the masonry. This can lead to the formation of cracks in the masonry or to the external wall flaking off.

When mixing and applying the cement plaster, protective gloves and goggles should be worn, as cement - just like lime - is highly corrosive as soon as it comes into contact with the skin. Any remaining plaster should be taken to the local recycling center.

Processing and application of cement plaster

Cement plasters are offered both in powder form as so-called dry plaster mortar and as fresh mortar. The cement must be mixed with water according to the manufacturer's instructions printed on the container. Before doing this, however, ensure a clean, dust-free and oil-free surface, remove old plaster and paint residues and have the required tools (steel smoothing, plastic smoothing, trowel, etc.) ready. After applying the cement, the tools must be cleaned with water immediately so that the cement cannot harden on them. Before a finishing coat or a layer of paint can be applied, the specified drying time must first be waited for.

Cost of cement plaster

The costs for a 25 kg sack of cement plaster start at around 8 euros, but can - depending on the manufacturer - be significantly higher. How far a sack goes depends, among other things, on the thickness of the plaster applied. It makes a lot of sense to hire a local construction company to do the plastering. Its costs are likely to amount to around 20 to 30 euros per square meter, provided that no pre-treatment (removal of older plaster residues or damaged areas on the masonry) has to be carried out. It is also advisable to have a cost estimate prepared and to compare the offers.