#lime #plaster #waterproof #how to
ANCIENT HYDROPHOBIC LIME PLASTERING FROM MOROCCO
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Let the lime come back to us ...
Let the house breathe ...
May the chemistry of all the elements melt, dance and enhance life.
It is today human family !!!!
Here we share an introductory notion, the proportions and step-by-step that we experiment, which is just one of the different variables to do it, also using the elements that each one has at hand. We invite you to try, experiment and discover without fear of error, since you always learn from it ...
Tadelakt is an ancient technique that resurfaces to be able to make the elements of our homes where we need them in a natural and sustainable way.
impermeability, cleanliness, softness and beauty.
How in the kitchen bathroom countertops showers etc.
These applications do not get dirty, repel dust and are seamless where dirt can be deposited.
Tadelakt (rubbing smoothing in Arabic) is a traditional lime coating from Morocco. There they discovered that with the use of a stone, the mass of lime with which they were working resulted in walls with an amazing softness and shine, the technique was discovered by accident and being resistant to water it began to be used for water containers.
LA CAL It is a natural binder made from limestone
We use for the two layers:
1 part of hydrated lime
1/2 of quartz talc (marble can be used)
1/2 of quartz powder
Lime is usually mixed with aggregates of different granulometries depending on its destination.
For this type of preparation, such as stucco, 0.5 mm and 0.8 to 2 mm aggregates are usually used. in different proportions.
It is good to cover the paste (that does not enter air) for a while. This ensures a good union of particles as well as a greater plasticity in the mixture.
The mixture remains useful for 2-3 days and it is always good to keep it to be able to fill any cracks.
No more than 10% pigment (ferrites) should be used in dry mix
The first coat will be 2-3 mm can be applied with gloves or a steel trowel.
Then we sponge it to make the surface porous for the next layer to grip.
It is necessary to wait for the
surface moisture (normally about 30 minutes (the appearance will be matte)
Do not lose sight of the work !!!
If touching the surface with your hand does not stain, we can continue
Second layer
We will apply the layer of 2mm approx. When there is loss of surface moisture
and sufficient hardness.
Then we proceed to smooth the surface in order to close the larger pores, leaving the surface smooth.
Do not apply too much pressure, then
you will be able to model better when you have lost
humidity.
We must let it dry again. Let's not abandon work in
right now, we won't know the exact moment to continue.
Compacted and burnished:
This is important to achieve a waterproof-resistant surface. This step
begins when the surface is hard enough so that when applying pressure we do not drag mass material or
let's damage the surface. (A common mistake is to rush and start this step before you lose adequate moisture, which will lead to cracks)
Suitable stones are hard (at least 6 on the Mohs scale) polished, such as quartz and agates.
Make small circular movements by pressing on the surface. This way we compact and close the pores while giving shine.
We can fill cracks or fissures with fresh paste applied with your finger and then
we passed the stone immediately.
Soaping:
We can use vegetable soap or black olive soap. You could also experiment directly with fat or oil. The soap must be very diluted in water. The chemical reaction that produces the union of vegetable soap (fatty acids) with lime, is a calcium stearate, "lime soap", this does not dissolve in water and gives the surface the property of being hydrophobic and dirt repellent.
Soap is normally applied around
24 hours after the application of the
tadelakt mortar (before it dries). do not apply excess soap as this would leave a superficial soap film, which when drying and then polishing could cause damage to the finished surface. We must apply soap in areas, apply soap and polish. Do not soap large surfaces that are not
we can go controlling. Soap reacts quickly with lime, if we wait too long to polish the surface, it will become too hard. When the soapy area loses its shine because it has been absorbed, we can start polishing.
Working with the stone by pressing
(too much can damage the
surface).
Finish with a polishing by making a crankpin with a plastic lined cloth, this will remove the soap residues on the surface and enhance the shine.
As an additional protection apply carnauba or bee wax.
25 сен 2020
