Laminate plaster grouting


An essential operation when we install laminated plasterboard is the grouting or plastering of the joints.

Next we will see how this operation does not entail any difficulty.

Purpose of grouting

In order for the walls to be completely smooth, once the laminated plasterboard has been installed and before painting, we have to plaster the joints, leaving them flush. This operation is known as “grouting”.

Therefore, the only purpose of the grouting is to hide the joints of the plates. In this way the walls will be completely smooth once the finish has been applied.

It is much easier than it may seem. It just takes some practice.

tools and materials

The first thing you have to know is what tools and materials you will need, which, by the way, are not expensive at all.


Gasket paste. And tape.

With the tape you have two options. The paper one or the fiberglass mesh one.

The latter has the advantage of not splitting or cracking with the expansion and contraction of construction materials.

So we’ll use this one.

As for the tools

Joint trowel. Spatula. A bucket or a basket. And a couple of abrasive sponges.

grouting procedure

Once we have everything ready, to prepare the pasta.

We are adding water, little by little, and stir well until we get a homogeneous texture.

To avoid wasting material, it is preferable not to make too much paste at once, but to make it as we need it.

We must get a soft paste but with enough consistency so that it does not drop.

grouting of gypsum plasterboard - photo 3

Next, we load the trowel and fill in the recess where the plasterboards meet.

grouting of gypsum plasterboard - photo 4

Then we present the tape, cut the necessary length and put it on by pressing with the spatula, until it is embedded in the paste.

We collect the excess paste with the trowel, to reuse it now, passing a new layer until the joint is flush with the two panels and the joining tape is completely hidden.

grouting of gypsum plasterboard - photo 5

I advise you to carry out the entire process in lengths of around three linear meters, no more. Since the paste could harden enough to complicate this task.

The product is dry and ready for sanding in approximately 24 hours.

The ambient humidity and temperature influence the drying, but we can calculate approximately over a day.

grouting of gypsum plasterboard - photo 6

Sanding of the paste

If the finish of the wall is going to be, for example, a tiling, we can perfectly skip this step.

On the other hand, if it is going to be paint, we must sand very well so that the joints of the plates are not noticeable.

Therefore, once the paste has finished setting, we will proceed to sand it.

This is the most tedious and physically demanding part.

As we at BricoBlog are DIY enthusiasts and we are not professionally dedicated to plaster applications, we had underestimated this part. We thought we could do it manually.

grouting of gypsum plasterboard - photo 7

After ten minutes, we have realized that it is materially impossible. So we have resorted to the wall and ceiling sander that we saw in this other article.

We put an 80-grit sandpaper on it. We hook it up to the vacuum cleaner and power, and we sand.

We passed smoothly and unhurriedly.

Once all the joints are flush, we can change the sandpaper for one with a higher number (finer) and make a few passes. However, our opinion is that it is not necessary.

grouting of gypsum plasterboard - photo 8

Short shot of before and after sanding.

Video tutorial of the complete process

Important information

It is appreciated that the sander comes with a set of sandpaper, but it is worth buying specific sanding discs for walls and ceilings. They will save you quite a bit of effort.

As can be seen in the following photograph, they are totally different and the abrasion power of the latter is much higher, which makes the job much easier.

On the other hand, indicate that it is not necessary to have a suction system.

We have tested this Ginour sander with external suction and also with the collection bag that comes as standard, and the tool’s own suction has pleasantly surprised us.

grouting of gypsum plasterboard - photo 9

Finally, before applying the finish that we have chosen, we have to clean the dust from all the walls so that the finish product adheres well.

As you can see, it is not that complicated. It just takes some practice to apply the paste. And the sanding, if you have a sander, is not too hard.

Now it would only be necessary to paint the walls or cover them with some material, as will be our case. We will cover them with microcement. But that will be later in another article.

#Nerpel #Ciret #Rota #Kana