You’ve decided to plaster your wall, but is it to protect it and prepare to paint it? Or is it decorative because you dream of having a mixture of lime and hemp, for example, as an ornament? Either way, you need to apply yourself for a neat rendering. It is important that your result is smooth and even. Coating a wall is not difficult if you take it step by step. On the other hand, follow the step by step and work very conscientiously. Only precision and thoroughness will guarantee you an impeccable coating. Whether you are plastering an interior wall or an exterior wall, you don’t necessarily need to hire a craftsman. You will still need some technical know-how on the material you choose as your plaster, and you will need to follow the correct instructions.
Why plaster a wall?
That’s it, the pipes, the openings for your electrical system, everything is ready? All you have to do is coat your walls. The objective is to smooth the surfaces so that they can then be dressed with a paint, a tapestry or a decorative plaster. In addition to presenting visual advantages, the plaster also has practical advantages. In particular, it regulates the temperature of the room. On exterior walls, it repels rainwater, dirt, UV rays and frost damage. It is also used for thermal insulation.
Which coating to use?
The most common material remains plaster. It is a mixture of sand, water and a binder. Depending on the type of binder, plaster has different properties and uses. You can also opt for a lime plaster or a clay plaster or a synthetic resin plaster. The type of plaster that is suitable depends on the situation: if cracks in masonry need to be leveled and durability plays a major role, a synthetic resin plaster is recommended. After the drying time, all types of decorative plaster can be covered with emulsion paint, mineral chalk paint or silicate paint.
Plastering interior walls: step by step instructions
To coat a wall, you need:
- Container, bucket and trough type
- Trowel or coating knife
- Coating smoothing
- Masking tape
- Laundry for walls
- Plastic tarpaulin
Step 1: the preparations
Before coating your interior walls, you need to do some preparations. Sweep the walls in question and completely protect the ground all around by covering it with a tarp. This prevents unsightly stains. If you are renovating, turn off the electricity so that you can remove the switch cover and the electrical outlet facades. Remove the wallpaper of course if your wall is papered. Remove the glue if there is any residue. It will probably be necessary to sand. Then wash off the surface of the old paint on the wall. After drying, proceed to sanding with sandpaper. You must repair damaged areas with putty, as the wall must be level so that the plaster can be applied evenly. If the backing is abrasive, uneven, or very absorbent, you should treat it with a deep primer and allow it to dry completely afterwards. Have all the tools and materials you need to apply the plaster close at hand. It is important to work quickly, otherwise the plaster will dry out.
Step 2: mix the plaster
Before you start plastering interior walls, if using dry plaster, it should be mixed with clean water in a suitable container. Follow the manufacturer’s instructions exactly. The plaster should not contain lumps at the end. Most types of plaster are now also available ready-made in a bucket. You just need to stir it before you start
Step 3: apply the plaster
When the plaster has been mixed, the first coat, the plaster base, can be applied to the wall. It regulates the absorbency of what is underneath. After the first coat dries according to the manufacturer’s instructions, you can apply your topcoat.
Step 4: apply the finishing plaster
The simpler version of plaster is applied with a roller like normal wall paint. Moisten beforehand and apply the plaster generously and transversely on the wall in order to distribute it evenly. If you are doing with another type of plaster, proceed a little differently: put a portion of plaster mortar on the straightener, place it firmly against the wall and smooth the layer with light even pressure. You can smooth in transverse, circular, diagonal or horizontal on the wall. You just have to work quickly.
Step 5: clean the tools
It sounds trite, but it is very important. Make sure that any tools that have come in contact with the plaster or coating are thoroughly cleaned. Once they have dried, they can hardly be removed. Wear gloves when cleaning the tool to avoid contact with the product.
Step 6: aerate
After plastering your wall, ventilate the room thoroughly. This is the only way for plaster and plaster to dry and harden properly. You also avoid possible health risks that may arise from the materials used and their vapors.