Find the right mortar

Without mortar made of lime and / or cement, most buildings today would not have been so durable and stable. Any home improvement can quickly mix mortar for use in their own home.

What is mortar used for?

Mainly mortar is used in the connection of stones to a wall or for wall plaster. Also on the floor mortar is used in a special variant. This is usually referred to as screed.

Many uses for mortar

But mortar finds many other uses such as the foundation of a conservatory or as a ring foundation for a greenhouse. Mortar is even used for thermal insulation.

Ingenious glue

Mortar is basically an ingenious glue that has barely changed over the centuries. Certain cladding elements are simply glued to the wall or ceiling with mortar and steel pipes are lined with cement mortar to protect against aggressive substances.

Important substance in fire protection

Fire protection mortar is again a special form of mortar, which is also subject to approval in Germany. The German Institute for Construction Technology regularly checks this building material so that the foreclosures created in each case offer the required fire resistance class.

Where does mortar come from?

Since ancient times, mortar has been known as a building material. From rubble or shot of bricks in a mixture with water and binder, the ancient Romans already made artificial stones. This mixture is considered a precursor of concrete and today's mortar.

Which mortar types are there?

Mortar consists of a fine binder without coarse inclusions and possibly a filler such as sand or gravel. For example, cement or lime is used as the binder. When water is added to the mixture, a chemical reaction begins and the binder hardens.

Standards and DIN

The standards for plaster mortar changed. The DIN 18150 for the previous plaster mortar groups is no longer valid. Now the plaster mortars are differentiated according to their purpose in DIN-EN 998-1, which came into force in September 2003.

  • GP - normal mortar
  • LW - light mortar
  • CR - fine plaster
  • R - Restoration plaster
  • T - thermal insulation mortar
  • OC - ​​plaster for plastering exterior

Which type of mortar is suitable for which work?

However, the entire DIN standards and scientific names hardly reflect the real use and naming in this country usual house building or in use by the skilled handyman again.

cement mortar

Most used in the construction of homes and other brick buildings of cement mortar. For this purpose cement is mixed with sand and water. Because the cement is slightly alkaline, you should not work it directly by hand while it is still wet.

Because of its good adhesive properties, cement mortar is used in many applications. After its complete hardening, it is frost-proof and weather-resistant for many years without any maintenance. Due to the high strength, pressure and impact will hardly cause any damage if the material has been processed properly.

Lime-cement mortar

In addition to the cement as a binder, lime is mixed in this mortar. Often this mixture is referred to as a kind of universal mortar and ready mixed sold commercially. This lime cement is slightly less resistant but easier to process.

Repair mortar - lime cement

Lime cement is often used as a kind of repair mortar. The ease of processing and its viscosity and adhesiveness can be used to repair damage to dry cement and concrete well.

The grouting of stone joints, which have become brittle in the course of time and may even have fallen out of the stone joints, can be repaired well with the lime cement mortar.


In a cement mortar is trassmörtel still ground tufa eingemengt. This volcanic ash stone causes the cement to harden more slowly. That is why it is widely used in the processing of natural stones.

Trass mortar is often needed for laying natural stones in the garden and on the terrace. Natural stone walls are also bricked with trass mortar and grouted. Depending on the type of stone, the slightly alkaline cement mortar will not adhere to the stone without the addition of trass.

Trass against the gray haze

Cement releases the contained calcium hydroxide during drying. This often shows up in greyish white streaks on the masonry, if the mason did not immediately wash off all traces of cement with a lot of water.

However, with the rough and edgy natural stones, which often have a porous surface, even such good rinsing helps little. Trass binds lime, therefore, when using trass in the mortar no lime streaks on the beautiful natural stones.

Special mortar and what it can be used for

  • Fire protection mortar for comprehensive fire protection measures
  • Gypsum mortar for fine work and indoor bonding
  • Water mortar for use even under water and in aggressive liquids
  • Resin mortar with an addition of polyester and / or epoxy resin
  • Fireclay mortar for lining and bonding firebricks in the fireplace and stove

Tips & Tricks

Universal mortar: If you as a handyman only occasionally need some mortar, you should buy a universal mortar that no sand must be added. Although this is a bit more expensive, but you always have mortar at hand.

Durability: To keep the mortar dry for a long time, it is best to use large freezer boxes from the kitchen. It does not matter if you have to divide the mortar into several cans. On the contrary, the individual cans are then opened less frequently and moisture can not penetrate.

Video Board: How to Match Mortar