Grout mortar - find the right tile grout

Find the right tile grout

Grout mortar - find the right tile grout: mortar

Laying tiles means: Prepare, glue and fill the substrate. The last step is visually crucial, because mistakes or defects are immediately apparent. So what should you know about jointing mortar and observe during processing?

The market offers a variety of tile grouts on. The selection depends on the type and format of the tiles, joint width, color, flexibility and hardening rate. For stoneware, stoneware or mosaic, there are usually no problems with the grouting. The situation is different with porcelain stoneware and natural stone coverings.

Although porcelain stoneware is a very robust coating, the polished varieties can also be prone to discoloration. Here should be an abrasion-resistant and fast hardening grout to get voted. Its rapid setting prevents discolouration by pigments rubbed into pores.

Among the natural stone coverings is the Marble known to be particularly sensitive to scratching. A special natural stone mortar that does not contain quartz powder and thus protects the marble surface is the product of choice.

Tile format and joint width

The DIN 18157 calls Guide values ​​for joint widths depending on the tile type and the tile format. Small tiles and narrow joints, large tiles and wide joints - that's what it used to be. This is not always the case today. For example, large format natural stone slabs are often laid with narrow joints.

The more important are the Packing information of manufacturers for the joint widths, for which the grout is suitable. A joint mortar for joints up to 5 mm should not be used for 20 mm wide joints, otherwise cracks can quickly occur.


In addition to the standard colors white and gray, there are currently with grout For narrow joints, a wide range of colors from pastel colors to intensive tones to ever new fashion colors.

A tip from practice: For floor joints are to prefer dark shadesbecause they are less sensitive to dirt.

Flexibility of the joints

Grout mortar - find the right tile grout: mortar

In the Laying on rigid substrates - such as concrete or cement screed - the joint mortar must not be flexibilized. On moving surfaces - such as chipboard, gypsum fibreboard or plasterboard - or substrates subject to temperature variations - such as heated screeds, balconies or terraces - the use of flexible grout is highly recommended.

A rule of thumb: If the tiles are flexibly glued, then it is also flexible to grout.

Stand for flexible grout two variants to choose from: Joint mortars that are flexibilized with plastic powders, and non-flexibilized grout to which a liquid plastic dispersion is added instead of the mixing water.

of hardening

During the grouting one is under time pressure, because The mortar must be processed quickly. For quick-setting joint mortar can be committed already after two to four hours.

Special requirements

Tiles are resistant to many chemicalsbut not a cementitious grout. If there is a risk that the tiled surface will be contaminated with hot fat, fruit juices, acidic foods or chemicals, an epoxy grout should be used.

For the application in shower and bath Special joint mortars are offered. They are characterized by particularly water-repellent properties.

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Video Board: Choosing the Right Grout for Your Tile Installation