Restoring Stone Facades: Weber Mortars and Techniques

Over time, the joints in stone rubble masonry deteriorate, allowing water to penetrate the walls.

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Common issues and queries you can face

Les pierres appararentes

Exposed Stonework

For exposed stone facades, use a mortar suited to the hardness of the stones or rubble masonry, with good adhesion.

Mortier assurant l'imperméabilisation

Water Infiltration

On exposed stone facades, slow down rainwater penetration at the joints by using a suitable mortar. This ensures the watertightness of the substrate.

Mortier décoratif pour mettre en valeur les pierres

Decorative Mortar

For exposed stone facades, choose a decorative mortar with a uniform color. It will enhance and highlight the stones or rubble masonry.

Choose the Weber Solution

A detailed, step-by-step illustrated Weber solution, including all the products used.

Substrate Preparation

  1. Dégarnir les joints de la maçonnerie

    Check and rake out the joints

    • Check that the joints are not made of gypsum or gypsum-lime mortar
    • Rake out the masonry joints to a depth of 1 to 3 cm and remove any deteriorated stones
  2. Brosser pour éliminer les parties pulvérulentes

    Clean the stones

    • Brush to remove any powdery residues.
    • Clean using sandblasting or wet sandblasting.
  3. Mouiller les joints à refus la veille de l’application

    Replace any missing stones and dampen the joints

    • Replace missing stones by sealing them with the selected mortar; allow at least 2 days for curing
    • Thoroughly dampen the joints the day before application until fully saturated

Application

  1. Application manuelle

    Apply the facing render manually

  2. Application à la machine

    Apply the facing render using a machine

  3. Brosser les joints

    Clean the joints and the stones

    • After a few hours of drying, brush the joints with a stiff bristle brush or scrape them with the edge of a trowel
    • Clean the stones or rubble masonry using a wire brush

Our recommendations

  • In the case of exposed stone render, apply a coat of render levelled to the most protruding stones. Then, while the render is still fresh, lightly expose the stones using a stiff bristle brush.
  • Important : only frost-resistant stones can be left exposed.
  • Refer to the product instructions for full details on their scope of use.

Packaging and Consumption

ProductPackagingConsumption
MANUAL APPLICATION  
Fine-grain facing mortar25 kg bagVaries depending on the width and depth of the joints.

Colored grain facing mortar

25 kg bag
Varies depending on the width and depth of the joints.s
MACHINE APPLICATION  
Fine spray facing mortar 25 kg bag
variable selon la largeur et la profondeur des joints
 

Coarse spray facing mortar

25 kg bag
Varies according to the width and depth of the joints.
Thick colored grain render30 kg bag 

 

Equipment

Manual Application

  • Concrete mixer
  • Hawk (mortar board)
  • Wire brush
  • Trowel
  • Pointing trowel (narrow/“cat’s tongue” trowel)

Machine Application

  • Hydraulic mortar pump
  • Special jointing nozzle
  • Wire brush
  • Trowel
  • Pointing trowel (narrow/“cat’s tongue” trowel)
  • Soft brush

Necessary products for this solution

Weber

parement grain fin

Enduit de parement minéral épais à la chaux aérienne pour application manuelle, teinté, grain fin

Weber

parement grain coloré

Enduit de parement minéral épais à la chaux aérienne pour application manuelle, teinté, grain moyen coloré

Weber

parement grain fin projeté

Enduit de parement minéral épais à la chaux aérienne pour application mécanique, teinté, grain fin

Weber

parement grain gros projeté

Enduit de parement minéral épais à la chaux aérienne pour application mécanique, teinté, grain gros.

Weber

enduit épais grain coloré

Mortier coloré "forte épaisseur" à la chaux aérienne, microfibré, grain coloré

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