How much flexible adhesive is needed for the installation of greywacke facade stones?

When laying polygonal natural stone slabs such as Graywacke facade stones The consumption of flexible adhesive on a wall depends on several factors:

  • Size and thickness of the stones
  • Texture of the stone back (even or uneven)
  • Type of substrate
  • Laying method (Teething of the spatula, back buttering)

Average glue consumption

  • 6 to 7 kg of flexible adhesive per square meter

This consumption takes into account:

  • Teething of the spatula: For heavy and irregular natural stones, a notched trowel with a notch size of 10 mm oder mehr.
  • Backside padding: Additionally, in addition to applying the adhesive to the wall, the back of the stones should also be thinly coated with adhesive to ensure optimal adhesion.

Justification

  • Irregular backs: Polygonal natural stones often have uneven backs, which increases adhesive consumption.
  • Weight of the stones: Graywacke facade stones weigh about 37–40 kg per square meter, which is why a sufficient amount of adhesive is necessary for secure attachment.

Recommendations

  • Use of suitable flexible adhesive: Make sure to use a high-quality flexible adhesive suitable for natural stones.
  • Observe manufacturer specifications: The exact consumption may vary depending on the product. Therefore, always read the technical data sheets of the adhesive manufacturer.
  • Professional advice: In case of uncertainties, it is advisable to consult a professional or craftsman who has experience with the installation of natural stones.

Additional Tip

  • Calculate a buffer: It makes sense to plan for about 10-15% more adhesive when purchasing materials to cover any potential losses or excess consumption.

 

Summary

For the application of greywacke facade stones to a wall, you should expect a consumption of flexible adhesive of approximately 6 to 7 kg per square meter This value ensures a secure and permanent attachment of the natural stones.

 

Disclaimer

Please note that the establishment, implementation, compliance, and control of laws, regulations, and official requirements are your responsibility. As a supplier of natural stones from quarries, we cannot be held liable for non-compliance with legal regulations or construction technical requirements. Due to the natural characteristics of our products, it is neither sensible nor possible to subject each individual stone to an elaborate inspection.

We therefore strongly recommend that you check all relevant legal regulations before using our products and, if necessary, seek expert advice.

 

Contact us

For further information or individual consultation, we are happy to assist you. We look forward to supporting you with your construction project.