Lay granite slabs


Although granite is also used in many public areas (road construction), it is still a very exclusive building material. Polished granite slabs and tiles are among the most beautiful wall and floor coverings. However, granite slabs also have their own characteristics when laying. So that you do not make any mistakes when laying the expensive granite slabs, we have compiled a detailed installation manual for you.

Granite - extremely beautiful and many benefits

Granite is one of the most sought-after natural stones used in interior design, but also on the outside. Finally granite brings many benefits.

  • extremely hard and resistant, so extremely durable
  • easy care
  • freezeproof
  • gap gray with high slip resistance
  • broad color nuance spectrum
  • Laying as slabs, tiles, cuboid

Granite is expensive, mistakes in routing all the more annoying

However, some of the advantages, such as the enormous strength, also represent a great deal of work during dismantling and processing. For this reason, granite slabs are among the most expensive natural stone slabs, especially for indoor use. Their price far exceeds that of marble. It would of course be annoying if serious mistakes were made when laying granite slabs.

Important preparation work in front of the granite laying

The preparatory work occupies a special place here. The enjoyment of the granite slabs will only be sustainable if you have prepared the respective substrate according to its properties.

Preparations in the outdoor area

Again and again you can hear that granite can not be laid on concrete. This statement is so wrong. Rather, it depends on the nature of the concrete substrate. Since concrete is mainly found outdoors, the slope is important because water must be able to drain below the granite. The gradient should be at least 1 to 1.5 percent. Then concrete must be painted with a special primer.

The second installation technique outdoors is the usual, if from the beginning granite slabs or cuboid were planned. A foundation of gravel with a height of about 30 to 40 cm is massively compacted, then comes grit, then the granite slabs. For grouting, high grade chippings are used.

Preparations in the interior

Indoors, you can deal with a variety of floors. First of all, you do not have to differentiate the surface from the ground, or hardly and strongly. Then a suitable primer is applied (primer with no or little absorbent soil, deep ground with strongly absorbent soil). Mineral substrate should be prepared with solvent-free, non-chalking and sanding substrate with solvent-based primer.

For indoor grouting, a cementitious grout suitable for granite is used. Meanwhile, the strength of the joints depends on the size of the tile or tiles.

  • massive cuboid: 10 mm and more
  • up to 60 cm plate or tile length: 30 mm
  • more than 60 cm in length: 40 to 50 mm
The mortar bed should have the following depths
  • when laying on walls: 10 to 20 mm
  • when laying on the floor, inside: 10 to 20 mm
  • when laying on the floor, outside: 10 to 30 mm
Granite slab thicknesses
  • inside: from 1.2 cm
  • outside: from 3 cm (passable much stronger!)
  • Be sure to pay attention!

Some materials do not match. For granite tiles, you must also make sure that there is no color change due to the contact of incompatible materials with the substrate and the adhesive. The following instructions refer to the laying of granite slabs indoors.

Step-by-step instructions for laying granite slabs

  • Granite slabs or tiles
  • Granite glue (usually also marble glue)
  • Cement grout for granite slabs
  • Primer according to your requirements
  • tile spacers
  • spacing wedges
  • Natural stone or granite silicon
  • mortar bucket
  • Electric drill with stirrer
  • suitable cutting device (more under "Tricks")
  • Trowel or trowel
  • trowel
  • pointing trowel
  • Fugenauskratzer
  • rubber hammer
  • Sponge board or rubber wiper
  • silicone syringe

1. Preparatory work

As already mentioned, the preparation work is of the utmost importance when working with granite. If you are unsure, better get a specialist. Otherwise, carry out the preparatory work as described above and how you will meet your requirements.

2. Mixing the glue

Stir the granite adhesive (natural stone and marble adhesive) according to the manufacturer's instructions. This includes a maturation time of 5 minutes. You mix water and glue in the prescribed ratio, stir vigorously and then let the glue ripen. Then it is stirred again vigorously.

3. Laying the granite slabs

The glue is best applied to natural stones in the "buttering-floating" process. To do this, apply the adhesive of the required thickness to the substrate and comb it with the tooth trowel, so that approximately 10 mm high webs are created. Then apply adhesive to the back of the granite slabs as well. The natural stone glue on the plates you comb now, but so that the webs later run across to those on the ground.

Now place the granite slab in the natural stone adhesive bed and push it in a circular motion into the correct position. Then press the plate firmly (not too tight, not too weak). Note your expansion joints to be considered on walls. If necessary, use spacer wedges. You can also use joint crossovers for the joints between the panels.

4. Lay the laid granite slabs

With grouting, you have to wait a while for granite slabs or because of the use of natural stone glue. The glue should have at least 3 hours to cure. Then stir the grout for natural stone (and granite) also according to the manufacturer.

Then you sludge the joints with it. To do this, use a joint sponge or rubber wiper. By cleaning the granite slabs you have to wait until the grout is only slightly damp. The right time is easy to recognize: if the grout is still too wet, it shines. As soon as she gets tired, you can continue.

Finally, you grout the expansion joints with the natural stone silicone. Inject a generous bead into the expansion joints. Then remove excess silicone with a puller or a well-wet finger.

Tips & Tricks

Cutting granite slabs can be challenging. Even with granite tiles, it is controversial to use a conventional, mechanical tile separator. With plates, however, almost impossible. You can use an angle grinder with a suitable cutting disc. However, you can never achieve a perfect cut edge. Therefore, you should cut granite slabs only with the angle grinder, if you can lay the cutting edge on the wall side or otherwise "hide" and it is no longer visible by, for example, baseboards. The optimal choice for cutting granite slabs would be a wet cutting table. However, these are often not worthwhile in the purchase for home improvement. You can borrow such machines but also in hardware stores and tool rentals.With a thickness of 0.8 to 1.2 cm is called a tile (granite, marble, all other natural stones), about (from 1.2 cm) of a Plate. The next gradation would be cuboids and palisades.


Video Board: How To Lay A Granite Patio