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Grouting of terrace slabs - loose or tight?

Loose filler material

When grouting with loose filler material, you can use sand or quartz sand as well as rock flour. The narrower the joint between the panels, the finer the filler material that you want to incorporate must inevitably be.

Loose filler material has both advantages and disadvantages. It absorbs tensions, which occur especially in winter, better than solid grouting. This means that the terrace slabs do not tear so easily.

However, the fine, loose filling material is also more easily washed out in heavy rain and has to be refilled more often.

Solid filler material

Solid materials for filling the joints insulate better and also dissipate moisture better. At least if the grouting has been correctly applied and a suitable material is used. Today, permanently elastic grout (€ 6.19 at Amazon *) n is used for the outdoor area, which is already mixed in every hardware store.

Grouting the terrace tiles neatly step by step

Since we are showing two completely different grouting methods here, there are, so to speak, two short instructions for grouting. Of course, you don't need all of the materials and tools listed.

  • Rock flour
  • Sand / quartz sand
  • Fine grit
  • Grout permanently elastic for outside
  • water
  • Bucket / masonry bucket
  • Trowel / joint trowel
  • Mixing paddle for drilling machine (€ 80.31 at Amazon *)
  • broom
  • shovel
  • sponge
  • Rubber lip

A1. Fill in loose filling material

The loose filling material should be mixed first. A mixture of sand and fine grit, for example, does not wash out of the joint so easily and actually gets stuck there. In this way, the joint stays longer and has to be refilled less often.

A2. Sweep, sweep and sweep again

The longer and more thoroughly you sweep in the loose grout, the longer it stays in the joint. Nevertheless, something will always slip in the first time that has to be refilled.

B1. Fill solid filling materials into the joints

The permanently elastic joint compound must be mixed with water according to the manufacturer's instructions. Then the mass is poured into the joints and worked in with a rubber lip. A narrow trowel is used to push in the narrow areas near the house wall.

B2. Cleaning the terrace slabs

The grout must of course be removed from the terrace slabs without leaving any residue. Similar to the tiles in the interior, the terrace slabs are freed from the grout with a wet sponge with clear water.

Even if this was quite common in the past, you should not use concrete or cement mix as a joint filling. The joints would then be rigid and cannot work.

After the first severe frost, in the best case scenario, only the joints would pop out. Often, however, the terrace slabs also break off or split off at the edges.

Author: Britta Meyer

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