Mortar can be used to decorate and renovate walls, indoors and outdoors.
Lime mortar has a pleasingly rough aspect and can help regulate humidity by absorbing moisture from the air, so it makes a room healthier, too.
Use a standard recipient, such as a large bowl, to measure out the ingredients.
Adjust quantities to suit the thickness of the layer you want (0.5 cm to 1 cm, for example).
For non-porous surfaces, such as walls covered with old paint, you should add a little cement* to the mix. The mortar will adhere better.
In a mason's mixing pan, mix 2 parts water with 2 parts lime, 1 part of cement and ½ part sand.
Always pour the water in first, then sprinkle in the dry ingredients.
Mix thoroughly with a stick, and then let rest for 5 minutes.
The mixture has the right consistency if when you separate the mixture with a spatula, the edges do not run together.
Before you apply the mortar, you should wire brush the wall, scoring it with a painter's knife if the wall is very smooth,
and moisten it with a damp sponge or spray bottle.
Apply the mortar with a spatula and plasterer's trowel, starting from the bottom of the wall.
While the mortar is still damp, you can wipe a sponge over it to bring out the texture of the grains of sand.
Once dry, there are a myriad of possibilities for the finish. You can scratch the mortar,
coat it with linseed oil or wax, or make a colored mortar with pigments.
* Cement manufacturers have taken steps to reduce the energy used to produce their products as well as their environmental impact.
Despite these efforts, these impacts are still high. When a home is renovated or restored, cement is difficult to reuse.
For this reason, please use cement sparingly.
Lime: Natural Hydraulic Lime (NHL 3.5-Z).
Sand: River sand. Different grades can be used, depending on the desired use or effect.
Cement: White or gray cement. More or less quick-setting.