Table of contents:

Reinforcing mortar: tips for processing
Reinforcing mortar: tips for processing

Video: Reinforcing mortar: tips for processing

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Video: slab Reinforcement process step by step || watch 2023, February
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If you want to find out more about reinforcement mortar, you will often come across terms such as reinforcement plaster, flush-mounted or embedding mortar, which are used interchangeably. We create clarity and explain what constitutes reinforcement mortar, where it is used and how you use it properly.

Table of contents Table of contents reinforcement mortar: product information and tips for processing

  • What is the difference between cement, mortar and plaster?
  • What is reinforcement mortar made of?
  • What distinguishes reinforcement plaster from conventional plaster?
  • Advantages of reinforcement mortar
  • Disadvantages of reinforcement mortar
  • How do you use the mortar as reinforcement plaster?

Table of contents Table of contents reinforcement mortar: product information and tips for processing

  • What is the difference between cement, mortar and plaster?
  • What is reinforcement mortar made of?
  • What distinguishes reinforcement plaster from conventional plaster?
  • Advantages of reinforcement mortar
  • Disadvantages of reinforcement mortar
  • How do you use the mortar as reinforcement plaster?

Cement, mortar or plaster are similar looking, viscous masses that are used for gluing, filling or filling of building materials. Because of their similarities, you can quickly get confused. Especially since terms such as reinforcement mortar and reinforcement plaster are often used interchangeably with reinforcement compound, reinforcement filler or embedding mortar.

What is the difference between cement, mortar and plaster?

Most of the product types consist of the same raw materials, namely lime, clay and sand. However, cement functions fundamentally different from the other two: cement is a binder that, as a component of building materials, ensures their material cohesion. If you mix cement with water, sand and gravel, you get concrete. On the other hand, if you omit the gravel and only add water and sand, cement mortar is created.

Varying binders and other additives produce different types of mortar with very different properties: masonry mortars are particularly pressure-resistant, thin-bed mortar is energetically attractive and gypsum mortar is suitable for gluing gypsum boards. The moment plaster mortar is applied to compensate for unevenness in insulation boards or walls and to create a flat surface, this is called plaster.

What is reinforcement mortar made of?

Plastering mortar also contains sand with grain sizes up to a maximum of four millimeters, water and binding agents (cement, lime, plaster or synthetic resin). Accordingly, a distinction is made between plasters with mineral binders (such as normal plasters or light plasters) and plasters with organic binders (synthetic resin plasters). Reinforcing mortar belongs to the latter. Its high synthetic resin content results in a robust plaster layer despite the low application thickness. Like the types of mortar, the types of plaster also have different properties: light plasters are elastic, plasters are particularly tensile and top plasters are visually appealing.

Good to know: There is no standard that defines the components of the reinforcement mortar, so different mixtures are in circulation. As a rule, the manufacturers match the reinforcement mortar to their respective thermal insulation composite system (ETICS), so that particularly strong connections to the associated reinforcement fabric are created.

Wand verputzen
Wand verputzen

Plaster refers to mortar with which walls or ceilings are coated in one or more layers. A distinction is also made between lower and upper plasters as well as external and internal plasters.

Photo: iStock / RGtimeline

What distinguishes reinforcement plaster from conventional plaster?

Plaster is generally understood to be a plaster mortar covering that is applied to walls or ceilings in one or more layers. While the interior plaster is being applied inside the house, the exterior plaster is attached to the facade. The plaster is used on the one hand for surface design, on the other hand for moisture regulation, thermal insulation and sound insulation.

Reinforcement plaster consists of a reinforcement mortar and a reinforcement fabric that is fully embedded in it. Thanks to this connection, reinforcement plaster becomes very tensile. Similar to the reinforcement meshes in reinforced concrete, the reinforcement fabric absorbs tensile forces that would otherwise affect the plaster layer. It also connects substrates with different stretching behavior. This increases the crack resistance of all plaster layers considerably.

However, reinforcement mortar has a lower compressive strength than other types of mortar, which is why it is actually only used as a concealed plaster. With conventional plasters, it is the other way round - like light plasters, they are not suitable as reinforcing plasters because they do not achieve the required tensile strength, but they are the better choice as exposed plaster / finishing plaster.

Advantages of reinforcement mortar

  • Very strong in combination with reinforcing mesh
  • Stabilizes the finishing coat
  • Prevents cracks in the masonry
  • Reinforces edge areas of window and door openings

Disadvantages of reinforcement mortar

  • Lower compressive strength compared to normal plasters
  • Use limited to flush mounting
Armierungsmörtel
Armierungsmörtel

The classic application of the reinforcement mortar is in combination with thermal insulation. But it is also used to repair cracks in masonry.

Photo: iStock / simazoran

How do you use the mortar as reinforcement plaster?

1. Mortar with reinforcement mesh

It is actually the reinforcement, the so-called reinforcement mesh, that completes the reinforcement plaster. This usually consists of plastic-coated, tear-resistant and alkali-resistant glass fiber fabric, which is very robust and easy to process. But it can also be made of flax, jute or plastic. Depending on the intended use, the reinforcement mesh is available in various mesh sizes and basis weights, 4 x 4 cm or 10 x 10 cm mesh sizes are common.

The reinforcement mesh is used both in composite thermal insulation systems and in the renovation of older plasters or cracks in the masonry. By embedding the reinforcement mesh, the plaster becomes considerably more resistant to cracking. Reinforcement fabrics embedded in plaster can also be found on plastered wall heating or in the area of ​​plastered edges - for example in the corners of window and door openings.

Attention: If there is a risk of cracks on the facade or old plaster that is at risk of cracking, a reinforcement plaster can reduce the risk, but not completely eliminate it. Depending on the type of crack, you should consult a specialist to prevent costly damage to the building.

2. Adhesive and reinforcement mortar for ETICS

As a rule, reinforcement mortar is used for EPS insulation or for insulation with mineral wool panels. You can often find it in the trade under the name "adhesive and reinforcement mortar". The reinforcing mortar is applied thinly to the insulation board to protect it and ensure that a flat and uniform surface is created. Due to its chemical coating, it easily dissolves the surface of the rigid foam panels and bonds firmly to it. In this way, the filler also "sticks" the panels together. The reinforcement fabric follows. Afterwards, further top coatings such as finishing plaster, ceramic facade cladding or flat facing bricks are applied. In this way, the reinforcement mortar as a concealed reinforcement contributes to the system-tight completion of the thermal insulation.

Armierungsmörtel
Armierungsmörtel

The reinforcement mortar is placed directly on the insulation board.

Photo: iStock / DimitarOmi

Embed reinforcement mesh in the ETICS: Here's how

  1. Apply a thin layer of reinforcement mortar to the insulation boards. Place the reinforcement mesh on the fresh plaster layer and press it lightly with the smoothing trowel so that it sinks into the reinforcement mortar.
  2. The individual fabric webs should not overlap, but always overlap by about 10 centimeters.
  3. Then apply a second coat of reinforcement mortar wet-on-wet and spread it very smooth.
  4. Now let everything dry exactly according to the manufacturer's instructions and then apply the finishing plaster or the facade cladding.

3. Reinforcement fabric on the floor

The third large area of ​​application is inside the house: If old wooden floors or OSB slab floors are to be tiled again, the reinforcement fabric compensates for any tension that arises. Because the wood works and in the worst case can cause cracks in the tiles.

Reinforcing fabric as preparation for tiling: how it works

  1. Screw on loose wooden planks. Then sand the entire floor and remove the sanding dust thoroughly.
  2. Pre-treat the floor with deep underground. Embed the reinforcement fabric in such a way that the strips overlap by 5 centimeters. Fix the fabric to the wood with a stapler.
  3. Spread the leveling compound over the fabric, ideally with a rubber wiper, and let everything dry according to the manufacturer's instructions.
  4. When the floor is dry and pressure-resistant, you can lay the tiles.

Good to know: The reinforcement mesh is used for this variant, but reinforcement mortar is not necessarily used. Instead, a special tile adhesive is used as a leveling compound, since the pressure load on the floor is higher than on the wall and the reinforcing mortar - as mentioned above - is not designed for pressure, but for tension.

Eva Bolta Redaktion Haus.de

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