Grouting patio slabs - loose or solid?


When grouting patio tiles, a distinction is first made between a loose and a firm joint filling. Then the width of the joint must match the selected material and the stone. What is important when grouting, we show here.

Loose filling material

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

Loose filling material has both advantages and disadvantages. Tensions that occur especially in winter, catch better than a firm Verfugung. This does not tear the patio tiles so easily.

However, the fine loose filler is also easier washed out in heavy rain and must be refilled more often.

Solid filling material

Solid materials for joint filling insulate better and also dissipate moisture better. In any case, if the grouting has been properly inserted and a suitable material is used. Today, one uses permanently elastic joint compounds for outdoor use, which are already mixed in every DIY store.

Gradually grout the terrace slabs

Since we show here two completely different methods of jointing, there are, so to speak, two short instructions for grouting. Of course you do not need all listed materials and tools.

  • rock flour
  • Sand / quartz sand
  • Split fine
  • Grout permanently elastic for the outside
  • water
  • Bucket / bricklayer bucket
  • Trowel / joint trowel
  • Stirrer for drilling machine
  • broom
  • shovel
  • sponge
  • rubber lip

A1. Fill in loose filling material

The loose filler should first be mixed. A mixture of, for example, sand and fine chippings does not easily wash out of the joint and gets stuck there. This keeps the joint longer and requires less refilling.

A2. Sweep, sweep and sweep again

The longer and more thoroughly you fill in the loose grout, the longer it stays in the joint. Nevertheless, there will always be something that needs to be refilled during the first time.

B1. Fill solid filling materials in the joints

The permanently elastic grout must be mixed with water according to the manufacturer's instructions. Then the mass is added to the joints and worked in with a rubber lip. At the narrow places near the house wall is pushed with a narrow trowel.

B2. Cleaning the patio tiles

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

Tips & Tricks

Although this used to be quite common, you should not use concrete or cement mixture as joint filling. The joints would then be rigid and can not work.

After the first strong frost, only the joints would pop out at best. Often, however, break the terrace plates or splinter at the edges.


Video Board: How to do pointing or fill the gaps between paving slabs or patio DIY