Stick natural stone slabs instead of fixing with mortar

The majority of natural stone tiles can be glued instead of mortared. Only thick and heavy panels in the floor installation should be better laid in the mortar bed. When gluing it comes next to the nature of the natural stone back on the adhesive substrate. For every material combination there are efficient and durable adhesives.

Adhesive mortars or pure adhesives

The differentiation between mortar and adhesive is fluent in some mixtures. For the horizontal laying on the floor aggregates provide in the mortar for adhesive properties. If natural stone slabs are stuck to the wall, pure adhesives are required.

Important in addition to the material properties of the materials that are connected to each other, is their "processing". Soft rocks such as sandstone and marble should be pretreated with primer. Also possible are lattice-shaped fabrics, which are applied to the back of the natural stone slabs with special adhesive.

Adhesive types and substrates

The different natural stone slabs are glued to the following substrates with suitable adhesives:

  • With polyurethane adhesive, natural stone can be stuck to wood
  • Thin bed tile mortar is the best choice for natural stone laid or glued on concrete
  • Bright adhesives and mortar mixtures for light natural stone types
  • For outdoor use frost-resistant adhesives
  • Construction adhesives for bricks and calcareous sand substrates
  • Polymer adhesive for hard and smooth surfaces
  • Tile adhesives must be expressly designated for natural stone surfaces
  • The softer the natural stone, the thicker the adhesive layer (middle rather than thin bed)

Glue butternd and floating

When bonding natural stone, especially outdoors, preventing cavitation is an important goal. In order to achieve an optimal distribution of the adhesive, the so-called "buttering" and "floating" is used in bonding:

1. The adhesive surfaces are brushed, watered and brushed again
2. The adhesive is applied to the natural stone back and wall or floor substrate.
3. When pressing the natural stone is easily moved back and forth.
4. Swelling adhesive is removed immediately or wiped off.
5. The plate is held or supported according to manufacturer specification during a drying phase

Tips & Tricks

When laying natural stones, adjust the bonding of the load. Pure adhesives stabilize the situation, but can lead to sagging of floor slabs due to excessive application.

Artikelbild: Brilliant Eye / Shutterstock

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