If you are building or renovating and you are getting ready to go into the finishing phase, you are sure to have the following question: how do you pass gypsum or dough on walls?
Currently the alternatives and methods used in civil construction are the most diverse and it is really complicated to decide what is the best process for your work. Both gypsum and running mass are used to fill imperfections and level masonry surfaces that remain in damp environments such as the living room, bedrooms, and rooms other than the bathroom and kitchen.
The application of the running mass and plaster is very similar, both can be made with a trowel or steel spatula, two or three coats so that the finish is perfect.
Positive points and advantages of plaster
- No need for sealant application prior to application;
- Dries much faster than dough run;
- Can be applied directly on concrete;
- The application is fast which generates time savings;
- Lower cost.
Negative points and disadvantages of plaster
- Because it is a porous material, the cost of painting increases because it consumes more paint;
- The product should be mixed with water prior to application to form a paste;
- Can not be used on exterior walls that are exposed to rain;
- Can not be washed;
- It is less resistant.
Positive points and advantages of mass race
- Because it is a material formulated for painting, it consumes less paint;
- Comes ready to apply, does not need preparation;
- It offers better sound insulation.
Negative points and disadvantages of mass race
- Need the application of sealer before the mass;
- Make sure surfaces are plated with plaster prior to application.
It's hard to say which one is the best. In our country, the construction culture still depends heavily on the plaster with the application of mass, this is the most common finish. In other countries, plaster or drywall is more often found.
How to pass plaster on the wall: materials needed
To pass plaster to the wall you will need the following materials:
- PVC and steel slitter;
- Trowel or spatula;
- 2m aluminum ruler;
- Aluminum angles;
- Plaster bags in sufficient quantity for the application of the area.
How to pass plaster on the wall step-by-step
1. Surface preparation
In order for the plaster to be applied efficiently and quickly, the surface must be level, without burrs. Ideally, the electrical part has already been finished, the hydraulic part too, jambs attached to the masonry and already installed air conditioning infrastructure.
It is important to wait at least 30 days after lifting the walls and ceilings to apply the coating with plaster, because during this period the mortar has already hardened and will not deform, the concrete has already settled and the plaster as well.
Remove any dirt, nails and any object that could damage the coating. Check if the walls are flat.
2. Mixture of plaster
The plaster packs are usually sold in 40kg bags in powder form. The plaster powder needs to be mixed in water in a proportion of 36 to 40 liters of water for each bag and must follow a specific order:
- Fill the masseira with water and sprinkle the powder so that it fills the bale evenly.
- Let the dough stand for 8 to 10 minutes for the powder to dissolve.
- Then part of the paste should be mixed, leaving the rest still at rest in the masseira.
- Allow the mixture to stand for another period of 3 to 5 minutes to induce the paste.
- Note the consistency of the paste, after this second waiting period, it can already be applied to the walls.
- At the end of the application of this first part of the mixture, the remainder which has remained at rest will be ready for use without the need for mixing.
3. Surface application
Using Plastered Plaster
Start the application always from top to bottom and protect the floor from debris and dripping dross covering everything with canvas. Use angles to finish the corners and corners, they protect the corners.
Wet the walls before applying the mass and on the ceiling make the application with a PVC trowel in back and forth movements. Then start the application on the walls, always from top to bottom. Take care of the thickness, it should be between 1 and 3mm.
The second coat should be applied immediately in the sequence, crosswise to the first layer and with the aluminum ruler you should remove the excesses and check the thickness according to the given references.
Use the steel trowel to level the surface evenly, eliminate ripples and flaws. Lastly, apply the last layer to correct possible faults and reach the desired final thickness. The final performance must be done with great care and whims until the surface is very smooth and regular.
Using smooth plastered gypsum
In this technique the applicator (or gossier) makes master lines and defines the height of the layers using taliscas. Taliscas are small pieces of ceramic in rectangular format that are fixed on the walls to delimit the thickness of the mass.
The spaces delimited by the masts and taliscas are filled with the plaster paste and the excess is removed with the aluminum ruler, as if you were passing a batten to level the mass. Finally, perform very carefully, similar to the one described in the smooth plaster application process.
Gypsum plasterboard or dry-wall?
Another plaster finish commonly used in interior finishes and renovations is the gypsum plaster also known as dry-wall. This finish comes in gypsum plates on card stock. It is practical, even easier to install, the aesthetic finish is great and has a great aesthetic diversity.
It is very versatile, can be cut in curves, can receive nails and screws and serves to assemble panels, partitions, walls and lowered ceiling. It allows you to install televisions, shelves and other objects on your surface and even other materials such as ceramics, glass inserts, wallpaper, fabrics, PVA ink and textures.
Reduction of costs in the work
The inner lining most used in construction remains the traditional slab and plaster, but it is a technique that, in addition to being very time consuming, raises the final cost of the work and gives a lot of waste of material.
By doing a quick calculation, the cost of the slab + plaster + plaster mass so that the walls are ready for use or to receive the final paint, it is an average of R $ 40 reais per square meter. This value already includes material and labor.
As the plaster can be applied directly on the masonry, it dispenses the chapéu and also the dough run. If the application is made with quality workmanship you save too much on the completion of the service, since you do not even have to paint.
Even when varying in value from site to site, the cost of applying plaster already with labor costs around R $ 15 per square meter, that is, savings of more than 50%. It really pays to think about the application of plaster in a renovation or construction.
And as you now know all the tips for applying plaster without the need to hire a specialized gyms, just acquire the materials and roll up the sleeves. Good luck!