Techniques used

Guaranty

Products used

No façade is built forever. When you look at the Pyramides today, you have to admit that a roughcasting from time to time would have kept their original size...

  

Techniques used 

   

The techniques used in façades roughcasting are described in a set of French standards, and follow professional rules of work called façades au mortier de plâtre "type parisien".

Preparation of the background : essential part of the work.

Wall covering preserving the original aspect of the façade : produits hydrofuges, class D1.

Wall covering with decor function : class D2.

Wall covering bringing a surface protection masking surface defects : class D3.

Continuous wall covering for impermeability : classes I1 to I4 according to demands.

 

Guaranty

 

Two years legal guaranty of good state

Five years guaranty of good state, by contract.

Ten years guaranty of good state, by contract.

Five years guaranty of good state and impermeability.

Obtening the guaranties is linked to the compliance to a process involving the manufacturers of used products : preliminary analysis, site visit(s), acceptance of work report.

The best respect of environnement is taken into account at the beginning of the development of a product.

 

  

Products used

 

Background preparation

Always wash a façade with high pressure water jet, to remove mould and dirty marks. Use a fungicide if necessary.
Color printing in aqueous phase, for low absorbtion backgrounds.
Type S colorless fixateur in solvent phase, to harden the mineral type backgrounds.
Colorless printing for concrete, cellular concrete, and cement rendering.

 

Class D1 (standard NFP 84 403)

The products classified D1 allow to keep the original aspect of the background.
They prevent water and any other liquid to penetrate the substrate.
 The waterproof products based on siloxane resins give a pearl effect.

 

Class D2 (standard NFP 84 403)

Synthetic resins : the most known is the acrylic, but some other exist.
  Main characteristics : environment friendly, large choice of colors, ease of use. Furthermore, these resins may be modified to make them elastic, waterproof, or else.
Silicates : mineral binding agent, allowing products extremely dull to be made.
  They are used only on mineral substrates.
  They are used on historic buildings, because they keep the original aspect.
  The choice of colors is limited, because they are alkaline.
Siloxane : the most recent family. They are easy to use, have a pearl effect, never peel off, withstand dirty marks and fouling, and may be applied on the most of substrates, with a very deep dullness.
  The choice of colors is limited, because they are alkaline.

 

Class D3 (standard NFP 30 700 or T 34 720)

The finishing corresponding to this class brings a light modification of the substrate aspect. 
If a rather thick layer is applied, the structure of the substrate will be relatively well kept. Applying a plastic thick layer (RPE : revêtement plastique épais) or thick mineral layer (RME : revêtement minéral épais) with a roll or a hawk modifies the original aspect and rendering.

 

Waterproof (standard NFP 84 403)

Class I1 (impermeability)

Good tolerance to microcracking(<0,2 mm)

1 printing layer
+ one finishing layer

Dry thickness : 0,2 mm

Class I2 (impermeability)

Tolerance to existing microcracking of the substrate (<0,5 mm)

1 printing layer
+ one intermediate layer
+ one finishing layer

Dry thickness : 0,2 mm

Class I3 (impermeability)

Tolerance to current and future microcracking (<1,0 mm)

1 printing layer
+ one intermediate layer
+ one finishing layer

Dry thickness : 0,2 mm

Class I4 (watertightness)

Tolerance to current and future microcracking (<2,0 mm)

1 printing layer
+ one intermediate layer
+ armature
+ one finishing layer

Dry thickness : 0,2 mm