A dependable and popular option for indoor and outdoor surfaces is cement-sand plaster. Walls are protected and given a smooth finish with this easy-to-make coating made of cement, sand, and water.
This kind of plaster is preferred because of its durability and adaptability. Cement-sand plaster is a weather-resistant and durable coating that can be applied to a variety of surfaces, whether you’re building something from scratch or remodeling an existing building.
The cost-effectiveness of cement-sand plaster is another advantage. Cost-effectiveness is a factor for many construction projects, as the materials are easily sourced and the application process is simple.
| Aspect | Description |
| Composition | A mix of cement, sand, and water. |
| Application | Suitable for both indoor and outdoor surfaces. |
| Durability | Highly durable and resistant to weather conditions. |
| Finish | Can be smooth or textured, depending on the application technique. |
| Drying Time | Varies, but usually takes several hours to a day. |
External finishing.
Cement-sand mortar is used as a leveling and protective facade cladding on the outside of the building. Primary purposes:
- Wind protection. To prevent the walls from losing heat through microcracks in the masonry material and joints, the facade is plastered.
- Thermal protection. In its pure form, cement-sand mixture is not an insulator. However, using special fillers (perlite, foam granules, sawdust), it can be used to insulate structures.
- Strengthening. The protective characteristics of cement-sand mixtures allow them to be used to strengthen loosened surfaces: without direct contact with the atmosphere, worn-out building materials of walls last longer.
- Aesthetics. The coatings are made as smoothly as possible. This has its own external appeal, especially with subsequent painting.
Plastering is important for "dirty" masonry, self-leveling wall construction, finishing cement, non-facing bricks, and gas blocks.
When cladding the building, you can save a lot of money by using cement-sand mortar for the facade. However, breaking the plastering regulations can result in excessive costs for fixing flaws and replacing a quickly deteriorating layer.
Internal.
The primary goal is to produce a solid, flawlessly flat surface that enhances the wall’s thermal characteristics, moisture resistance, and thermal conductivity. The aesthetic element is equally significant.
Insulating additives can be added to cement-sand plaster for interior applications.
For both interior and external surfaces, cement-sand plaster is a flexible and long-lasting solution that offers a sturdy, smooth finish that both improves the appearance and shields walls from the elements. Because of its strength, this kind of plaster works well in a variety of settings, including humid interiors and abrasive outdoor ones. Cement-sand plaster blends practicality and ease of application, making it a dependable option for smoothing out walls or priming surfaces for painting.
Cement-sand mixture for plastering: characteristics of the material.
GOST determines the properties and necessary features of cement-sand mixtures (5802-86). The information is gathered during examinations conducted by experts.
Solutions are therefore classified according to their strength, plasticity, etc. properties.
A particular kind of blend is linked to that particular brand. Plastering requires a cement-sand mixture of grades M25, M50, and M100.
- M25 is prepared in a ratio with sand of 1:13.5 – for cement M500, 1:12.5 – for cement M400, 1:10 for M300.
- M50: 1:7 with sand – when using M500 cement, 1:6 – for M400, 1:5 – for M300.
- M100: for M500 cement – 1:4.5; for M400 cement – 1:3.5; for M300 – 1:2.5 with sand.
The strength characteristics of a solution increase with its grade. High-strength plaster should not, however, be used everywhere. This is damaging in addition to being improper. Particularly if it’s facade plaster made of cement and sand, which is more costly and comes into closer contact with harsh environments:
- Overpayment. Using expensive durable mixtures everywhere, “indiscriminately” increases the overall cost of plaster. This does not make sense.
- Reduced reliability. Durable solutions are prohibited from being applied to “weak” surfaces: it is impossible to achieve their tight, strong connection. New, has a risk of “falling off”.
- Vapor permeability. Water vapor passing through the wall should not encounter less permeable obstacles on its way. Otherwise, the dew point may shift into the wall mass, periodic condensation may occur, the material may become damp and deteriorate.
- Thermal conductivity of cement-sand plaster increases due to over-moistening.
Weaker cement-sand plasters "stick" to loosening bulk structures made of weak concrete more firmly.
Plastering with cement and sand by hand can be accomplished quite effectively. Only slight surface distortions and increased work hours result from a lack of professionalism among the workforce.
Rules for the preparation of cement mortars.
The following procedures are followed to ensure that the components are tightly connected during mixture preparation:
- First sand. Sand is sifted through a sieve with 3×3 mm cells. This allows you to get a more homogeneous solution, exclude small pebbles, pieces of rock and plant debris from getting into it.
River sand grains are more gently rounded and have less "torn," ribbed edges. Thus, using quarry sand makes more sense.
- Then cement. The ingredients are thoroughly mixed. The better the components are mixed, the stronger and better the cement-sand mortar.
- Water is added gradually, in small doses. When mixing, a critical moment occurs when the smallest amount of water can become excessive. Therefore, it is not poured in large portions.
It is not advised to use hard water that is high in salt.
It is best not to make an excessive amount of cement-sand mortar because it becomes sticky very quickly when water is added.
An excellent option for both indoor and outdoor projects is cement-sand plaster. It is a sensible choice for many different kinds of construction because of its resilience to different weather conditions and durability.
A smooth, durable finish can be achieved with this kind of plaster with the right preparation and application. The outcomes can be both aesthetically pleasing and practical, regardless of whether you are working on external facades or interior walls.
You can improve the overall quality of your building work by achieving a professional finish by using the appropriate techniques. A useful and adaptable material, cement-sand plaster can handle the demands of a variety of plastering projects.
