When talking about plasters, we must first clarify how they differ from screeds, as they are similar concepts in construction. The main difference is that plasters are applied to the walls of a room, while screeds are applied to the floor.
TYPES OF PLASTERS
In general, there are two types of plasters: external and internal. External plasters are silicate, silicone, mineral and polymer. Internal plasters are divided into lime-cement and lime-gypsum.
LIME-CEMENT PLASTERS ARE SUITABLE FOR BOTH INTERNAL AND EXTERNAL APPLICATIONS
Lime-cement machine plasters are suitable for both indoor and outdoor use.
Exterior plasters are an important part of wall construction. They are both protection and decoration of any building. Their main purpose is to protect the masonry from external weather conditions and to preserve the construction and physical qualities of the walls. This is achieved with a combination of the high strength of lime-cement plasters and an appropriate final coating with water-repellent properties.
In general, the interior plaster is applied before the exterior plaster and before the floor. If the exterior plaster or facade thermal insulation is applied before the interior plaster and before the floor, this may lead to damage to the interior plaster and putty due to poor drying.
Due to their mineral composition, lime-cement machine plasters are particularly suitable for interior use and offer modern architectural solutions. The surface of the plasters does not require additional preparation and is ready for the application of all interior finishing coatings (paints, wallpapers, ceramic coatings, etc.). Lime-cement-based plasters have the ability to regulate the climate in the rooms by absorbing excess moisture from the air and then releasing it. Therefore, they are the only ones suitable for damp rooms.
WHAT TOOLS ARE NEEDED TO APPLY PLASTER?
The necessary tools that everyone should have when they want to do plastering easily and correctly are the following:
1. Trowel, putty knife, trowel, trowel (large plastering trowel), bucket, 2-3 buckets (plastic) or a large black plastic basin to have somewhere to mix the solution.
2. Drill and mixer.
3. The most important attributes are a good level and an aluminum ruler. The ruler should be about 2 m long. It can also be 1.50, 1.80, 2.50 - decide what size you will need. It is best to have different sizes - one 2.50 m, one 2.00 m and one 1.50 m.
PREPARATION FOR APPLYING INTERIOR PLASTER
The base must be sound, dry, load-bearing, level, with completed shrinkage processes and a temperature not lower than +5 °C. All weak areas and layers with poor mechanical resistance must be removed from it in advance. When laying on masonry, it must be built according to regulatory requirements and must have filled joints. If necessary, the joints must be filled with masonry mortar.
Highly absorbent substrates should be thoroughly wetted before applying the plaster. Unevenly absorbent substrates should be sprayed with a thin cement-sand mortar beforehand.
Substrates with smooth and highly polished surfaces with minimal water absorption (vibrated concrete, etc.) should be primed.
Before applying the plaster, to facilitate the work, stainless steel protective profiles are installed on all corners and edges. In bathrooms and areas subject to subsequent concealment, metal guide profiles should be used as an aid when removing the plaster.
IMPORTANT! WET THE PLASTER TO AVOID CRACKING!
Lime-cement plaster dries in 25 days, but must be moistened to prevent cracking. When using heating appliances, good (lateral) ventilation must be ensured. Direct heating of the plaster is unacceptable. Freshly applied plaster must be kept moist for at least 2 days.
Before applying each subsequent coating, a technological rest period of at least 10 days for each centimeter of plaster thickness must be observed. Installation channels, masonry joints, openings and the like are filled in advance, in a separate work cycle, with a suitable lime or cement mortar.
When combining with other wall or ceiling materials, it is necessary to create a thin separation joint (e.g. with a trowel) to the base of the plaster.
ADVANTAGES AND DISADVANTAGES OF LIME-CEMENT PLASTERS
Advantages:
- For internal and external use;
- For rooms with different humidity levels;
- Has load-bearing capacity (ceramics can be laid);
- Has a thermal insulation effect (accumulates energy);
- Highly breathable;
- No restrictions such as final finishes
Disadvantages:
- It cannot be repaired (corrected) – it must be puttied.
WHAT DO WE OFFER?
With us you can find lime-cement plasters for interior and exterior use by WEBER and BAUMIT in various sizes, as well as hydrated lime by TERAZID. The plasters can be applied by machine or by hand. They have different characteristics, which are mentioned in their technical data sheets.
The prices are affordable.
