Slabs with tongue and groove construction are a common option for building robust walls and ceilings. Because of their interlocking edges, these slabs can provide a smooth and appealing finish. Nonetheless, there are circumstances in which plastering these slabs is required. A smooth and long-lasting surface can be ensured by knowing when to plaster.
To achieve a perfectly flat and even surface, tongue and groove slabs are frequently plastered. Although the interlocking design reduces the amount of seams and gaps, small flaws or irregularities may still happen. By offering a smooth foundation for painting or other finishes, plastering can assist in resolving these problems.
Plastering is also necessary in situations where the slabs are used in locations that need additional security. For instance, a plaster layer can increase durability and protect the underlying material from wear and damage in areas that are subjected to moisture or heavy traffic.
Plastering also has the potential to improve the slabs’ overall appearance. Plastering allows for flexibility in achieving the desired aesthetic or texture if that is the main objective. Plastering offers a multitude of customization choices, whether the goal is a more textured effect or a sleek, contemporary finish.
- What are tongue and groove slabs
- In what cases is it necessary to plaster tongue-and-groove slabs
- How to plastering groove slabs
- How to prime tongue-and-groove slabs before plastering
- How to plaster tongue and groove blocks
- Features of PGP plastering in damp rooms
- Video on the topic
- How to prepare walls made of tongue-and-groove slabs PGP for wallpaper
- Why we do not use tongue-and-groove slabs (PGP) for installing partitions? IMPORTANT in repairs!
- Cement plaster in the bathroom on gypsum walls on tongue-and-groove slabs PGP is possible or not?
- How does gypsum plaster adhere to tongue-and-groove blocks experiment
- Plastering tongue-and-groove slabs
- Plastering tongue-and-groove slabs / When is it necessary to plaster PGP?
What are tongue and groove slabs
It was long ago that the tongue and groove connection was created. A lot of people recognize it from the lining (where protrusions and grooves are used to join the boards). The creators of a novel partition material selected rectangular slab blocks with a thickness of 8 to 10 cm and used this connection to secure the blocks to one another around the perimeter.
When joined, tongue and groove rectangles create a "canvas" with smooth, even surfaces. With this design, partition assembly can be completed much more quickly and without the need to build a frame, which is necessary, for example, when installing plasterboard. Tile adhesive or assembly mixture is used for the installation.
The process of casting gypsum pgp involves adding plasticizing agents to a gypsum solution. Due to the fact that only gypsum grades 4 and higher are utilized in their manufacturing, the products are incredibly durable.
Gypsum is well renowned for its capacity to create microscopic pores that allow the material to breathe, exchanging moisture and gases with the environment. Consequently, pgp promotes comfortable living and is ecologically friendly. The blocks are robust, reusable, and non-flammable.
Since gypsum "does not like" too much water, water-repellent additives are added to the raw gypsum to create pgp. These products are used in rooms with high humidity levels; they have a greenish tint. Slabs that are hollow and solid are made and weigh less.
Quartz sand and water are combined with quicklime to create silicate tongue-and-groove slabs. After molding by pressing, the mixture is heated to a high temperature in an autoclave.
Because these products are more durable than gypsum, load-bearing walls between rooms can also be constructed with them. Silicate pgp is used to build partitions in bathrooms and other damp areas because it is a resilient lime-sand conglomerate that is less afraid of dampness. These products have a heavier weight.
Up to 11.5 cm thick solid and hollow panels are also produced by them. Compared to gypsum, they have superior soundproofing capabilities. 150 is the material grade. They are less expensive than gypsum blocks as well.
In what cases is it necessary to plaster tongue-and-groove slabs
An almost flat surface with seams as small as 2 mm can be obtained with proper installation. These partitions don’t require leveling, and the finished "canvas" is puttied by covering it with a thin layer of putty mass. Plastering is not necessary on a level surface before tiling a partition.
Plaster will be required if…
- The finish will be painting or pasting with light thin wallpaper (performing a putty);
- If the base of the first row was carried out poorly, which entailed uneven addition of parts;
- If there is a shrinkage of the building, and it is also necessary to prevent cracks with the displacement of the PGP relative to the neighboring (reinforcement is necessary).
Newcomers are frequently accepted in the "assembly" scenario, where things don’t always work out the first time. For practical or decorative reasons, the partition may occasionally need to be thickened at the location (even if it has a level surface). Then, we are thinking about this option because the plaster of the grooves is required.
How to plastering groove slabs
The characteristics of the PGP material ultimately dictate the choice of plaster. Compared to brick or concrete, gypsum is less strong. Consequently, it is not advised to fill gypsum boards with a plaster layer that contains thick mortars like cement-sand. Plastering with cement-based mixtures is also impossible due to another property of gypsum, which is its conflicting "relationship" with cement.
There are still compositions made of lime or gypsum. The former makes more sense to use. Gypsum solutions combine to create a plastic coating that is light, rapidly dries, and has the same coefficient of linear expansion as pgp based on gypsum. When applied correctly, these compositions create a smooth painting surface that requires no puttying.
Silica pgp presents a distinct issue. Cement or gypsum-based mineral compositions can be used to plaster them. It is possible to plaster using lime-cement plasters or lime-gypsum solutions.
How to prime tongue-and-groove slabs before plastering
Dust that is difficult to remove is applied to the surface during the grooves’ manufacture, transportation, and installation. Furthermore, adhesion is improved with a primer composition for reliability, even though gypsum solutions are tenacious. The capacity to fortify the surface layer and seal the pores that allow moisture to be absorbed from the solution is the third justification for priming.
Aerated concrete and gypsum plaster mixtures work well for priming. Deep penetration agents are applied to the surface twice, with a drying period in between each application of the composition. Use a standard roller or brush for priming. Additionally, dry the partition after applying the second layer.
How to plaster tongue and groove blocks
Plastering walls varies little from standard practice, with the exception of a restriction on the type of base of the plaster composition. The layer has a small thickness if the walls are level. This implies that plastering does not require beacons. Beacons are used if the coating thickness is greater than 10 mm.
Applying a splash layer is not required because other measures ensure good adhesion. One layer of plastering is done. In areas that are flat, reinforcing plastic or fiberglass mesh is installed if the thickness is greater than 3 cm. Perforated corners with mesh are used to reinforce the corners.
Use a rule to level the base after applying the solution. The sharp edge of the rule is used to cut the solution once it has set, which takes around 40 minutes. Make sure that after the plaster mass dries, the beacons are removed.
Using a wide spatula, level the areas next to the grooves along the hardened plastered surface after filling them with a gypsum mixture.
The top of the plaster is sanded or leveled with stainless steel spatulas if a smooth surface is needed for painting. Moreover, you could putty the surface.
When you need a smooth, even surface for painting or wallpapering, plastering tongue and groove slabs is frequently required, particularly if the slabs have noticeable joints or flaws. This procedure fills in any gaps and uneven spots that might otherwise detract from the finished look of your walls, giving them a polished finish, increased durability, and a professional appearance.
Features of PGP plastering in damp rooms
All materials and technological approaches are chosen for renovation projects involving bathrooms or other spaces where high humidity is anticipated in accordance with the following criteria:
- PGP type (moisture-resistant), primers;
- types of putty or plaster with hydrophobic properties;
- finishing materials that are not afraid of water exposure;
- installation of a waterproofing layer, etc. .
Silicate or gypsum waterproof tongue-and-groove blocks are typically selected for such rooms. You are limited to surface priming in locations where gypsum boards do not come into contact with water.
However, technologists advise covering the primer with waterproofing agents when contact is possible. Using waterproofing tape and adding one or two layers of waterproofing to the bottom of the wall are also essential steps in stopping the infiltration and rise of water from the bottom of the partition. The article about whether tiles can be laid on gypsum plaster might be helpful to you.
Deep penetration primer plus polymer-based coating primer applied in two layers is the traditional method of protecting tongue-and-groove slabs.
| Case | Reason for Plastering |
| Uneven Surface | Plastering smooths out any irregularities in the tongue and groove slabs, creating a more even surface for finishing. |
| Surface Preparation for Painting | Plaster provides a better base for paint or other wall treatments, ensuring better adhesion and a more uniform appearance. |
| Concealing Joints | Plastering hides the joints between the slabs, making them less noticeable and giving the wall a seamless look. |
| Improving Durability | Applying plaster can enhance the durability of the wall, protecting it from minor damage and wear. |
| Acoustic and Insulation Benefits | Plaster can improve sound insulation and thermal properties, making the wall more effective in controlling noise and temperature. |
For a number of reasons, plastering tongue and groove slabs may be crucial. For these slabs to look better and last longer when used in construction, a finishing layer is frequently required. In the absence of plaster, the uneven surface and obvious joints between the slabs may take away from the room’s overall aesthetic.
Plastering not only improves appearance but also contributes to a more even, smooth surface. This guarantees that the walls are prepared for painting or wallpapering in addition to improving the aesthetic appeal. A polished finish and imperfection masking are possible with a well-applied plaster coat.
Plastering, finally, also helps to keep the slabs safe. It provides an additional barrier against environmental elements like moisture and temperature changes, which over time could cause damage. Plastering tongue and groove slabs guarantees that the walls will function well and stay in good condition for the duration of their life.
