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How To Prepare Walls For Plastering

How To Prepare Walls For Plastering

Plaster is a smooth paste made of sand, lime and water which is used to cover walls and ceilings. It forms a smooth hard surface when dried. Wall plastering is a process of covering rough walls of commercial buildings.

Wall plastering is done to prevent the brickwork from absorbing water. Now the question that arises is “how to prepare walls for plastering?” Here is the 5-step process of preparing walls.

1. Remove The Wallpaper

The first thing to do is to remove the existing wallpaper. Before plastering, make sure the wallpaper is entirely removed, and there is nothing left so that the plaster gets attached to the surface entirely.

2. Wash The Walls

After removing the wallpaper, wash the walls down with sugar soap entirely. By washing the walls, it will remove the unwanted grease and make your wallpaper clear. Unwanted grease affects the plaster in the wrong way.

3. Check The Walls For Loose Plaster

After washing the walls and removing the grease, you need to check the walls for any loose plaster. You need to check it with your hands. The loose plaster falls off once you touch it. Remove the peeling paint too.

4. Scrim Tape

Once the walls are clear, you need to apply scrim tape where the cracks are showing. Scrim tape keeps the plaster in place, and it prevents the cracks onto the finished walls.

5. PVA

Once you are done with all the steps mentioned above, you need to roll the walls with PVA glue. The PVA glue acts as a primer. It prevents the walls from drawing all the moisture from the plaster. Instead of PVA, you can even use Blue Grit. When your wall is rolled with PVA or Blue Grit, your wall is ready for plastering.

When you are preparing your walls for plastering, you can test the suction. You do not need to take a suction test if you are plastering onto the plasterboard. You can check if your wall is high or low suction. If your wall is high suction, it means that your wall is too porous and if it is low suction, the plaster will struggle to stick to the wall. To check your wall suction, you need to take a towel and load a small amount of plaster in it. You then need to smooth it over a small area of the wall at about 2mm in thickness. If your wall is still wet, that means your wall is of low suction, and if your wall has dried, it is of high suction.

Preparing before wall plastering is easy if you follow the above steps. If you have any doubts, you can get in touch with us and get all your queries cleared.


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