How to recover an external wall

How to recover an external wall

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How to recover an external wall: instructions, step by step, to restore the plaster and repair the deterioration of an external wall. From the repair of cracks to the renovation of the plaster.

To start the work we will need several tools such as spatulas, trowels and brushes. If it is necessary to redo the entire plaster, you will need to get a chisel and a hammer to remove the old deteriorated plaster.

How to recover an external wall

For the recovery of an external wallbe it a garden, a terrace or a balcony, a good dexterity will be required. THE external walls are very subject tohumidity, in fact this guide is particularly suitable for the recovery of damp walls and heavily affected by molds, inflitrations, mosses and atmospheric agents.

The first thing to do is to remove all unstable parts of the wall: first scrape off the detached paint and then remove the plaster and any skirting boards.

Before starting the recovery work, wear a protective dust mask and paper the surrounding area with old newspapers and protective cardboard.

How to remove the baseboard

If you also need to replace the skirting board, you just need a chisel and a mallet. Approach the chisel in an inclined position on the upper edge of the skirting board and tap, with a sharp blow, with the mallet. If the skirting board is worn it will come off very easily.

How to remove the plaster

Also in this case you must use mallet and chisel. In fact, in case ofdamp walls, rich in inflitrations and now yielding, just tap lightly with the mallet without even using a chisel.

Once the plaster has been removed, the wall will have an irregular and very dusty appearance.

It is not necessary to remove all the plaster: just remove it only in the areas most affected by humidity and moss.

For the rest, continue the work with a spatula going to scrape off the paint now raised from the wall.

Use a dry brush or a compressed air gun to remove all dust. Pay close attention at this stage: dust can penalize subsequent work.

How to recover an external wall, the reconstruction

In this phase, in addition to the tools seen above, you will need different materials such as concrete, paints or resins.

Prepare the cement mixture to restore the plaster. The amount of liquid to add is indicated on the cement package. To prepare the cement mixture, you will need a cauldron (bucket) and a trowel, as well as fine sand or the preparation purchased from a typical shopBricoorLeroy Merlin.

If you have removed large portions of plaster, to restore the wall you will need a fixative liquid that will allow you to better adhere the concrete to the masonry base.

How to make concrete

Add the sand to the cauldron and pour the cement in a 2: 1 ratio. Although these are the proportions generally recommended by any bricklayer, it is advisable to read the instructions on the back of the purchase package.

1). First, mix the sand well with the cement, without adding water.

2). Add an appropriate amount of water to obtain a soft but dense mixture. Mix these three ingredients thoroughly.

3). Add the additive in the quantities indicated on the back of the package and mix thoroughly.

Apply the cement

To facilitate the adhesion of the concrete, spray a few drops of water on the bare wall where the plaster is missing.

Apply the cement where theplaster: remove the excess cement applied with a line that will make the wall perfectly perpendicular to the floor.

When applying the concrete, apply a lot of pressure to fill any gap in the wall.


Once the cement has been spread, wait for the drying times and then pass a layer of fixative with a brush (or a roller in the case of large surfaces) to facilitate the adhesion of the premixed plaster.

The new plaster

Use a premixed plaster, which is much easier to manage. They exist on the marketpremixed plasterswith granulometers suitable for any type of environment: choose the one you prefer. The plaster will be your finish and will be covered only by the layer of paint.

Generally, they are found on the marketplasterspre-mixed powder to be mixed with water before application. The plaster should be spread with a steel trowel, the same used for applying the cement.

Slightly moisten the base cement to improve the adhesion of the plaster. The plaster layer must not be too thick.

L'plasterpremixed should be spread over the entire surface of the wall and not only in the parts where the old plaster was missing.

Eliminate imperfections using the trowel and a few drops of water to be dosed with caution. Work with a trowel until you get a perfectly smooth surface. Do not be discouraged, you are almost at the end and this is probably the phase that requires the most patience because it is not easy to perfectly level the new plaster.

Once the plaster has dried, you can paint the wall as you prefer.

If you have problems with mold, rising damp or strong infiltrations, add anti-mold material to the concrete or replace the classic concrete with one particularly suitable for humid environments.

Video: DIY TIPS - How to repair cracks in walls. TAOutdoors (May 2022).