Restoration render system

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Properties
Application limits

Restoration render systems

The right system solution for all saline loads

The main task of the restoration renders according to WTA is to store salts and ensure a dry and salt-free surface. Remmers restoration render systems ideally fulfil the criteria stipulated in the WTA information sheet 2-9-05/D ‘Restoration render systems’.

A stroke of genius and its implementation

The task of restoration render systems is to ensure a dry and efflorescent render surface for a longer period and to offer the brickwork long term protection because the salts are stored in the render and can be removed from the brickwork. To achieve this, restoration render systems work in two ways:

Restoration renders are water repelling but also highly breathable. This relocates the evaporation level from the surface into the render cross-section

Undercoat renders assume the function of a storage layer. Fluid moisture and the soluble salts it contains should be able to penetrate the render and leave them in the undercoat when the restoration render diffuses

The pore volume of the respective render needs to be designed specifically to not only meet these requirements but also fulfil these to the optimum. This pore volume was scientifically researched in more detail as part of the cooperation between the laboratory for building materials engineering at the FH Münster and Remmers. The insights obtained from the study are used consistently in render mortars from Remmers up to the present day.

Restoration render properties

Restoration renders are hydrophobic so that no salts dissolved in the water can enter the surface.
Undercoat renders serve to store the salts. The penetrating moisture leaves the dissolved salts here when the restoration render diffuses.
Restoration render systems have such a high salt resistance that a single-layer of 20 mm layer thickness is sufficient even for a ‘medium’ degree of salting
.Restoration renders without waterproofing up to a degree of moisture saturation of < 40% can be used.

Pores are not all the same

In addition to the capillary pores in the binding agents, restoration renders and/or undercoat renders have greatly varying pore types. Firstly, non-capillary-active pores that are created by air-entraining agents, so-called ‘surfactant pores’. Secondly, capillary-active pores that are created by adding special light-weight aggregates.

As salts can almost only be stored in capillary-active pores, capillary-active pores are decisive for the function and durability of undercoat and pore undercoat renders. ‘Surfactant pores’ should be selected if possible for restoration renders that still need to be diffusible or water repelling. Remmers restoration render systems stand out thanks to their particularly high durability. Ultimately, this is due to the consistent implementation of the described findings. In this way, made-to-measure performance and application profiles in the different render systems can be formulated.

General application limits

Pursuant to WTA information sheet 2-9-04/D, restoration render systems are as follows: If the pores of the brickwork are saturated, suitable waterproofing / drying measures need to be taken before applying the restoration render system. In practice if the part saturation level is > 40%, the building needs to be waterproofed professionally before an inner restoration measure is carried out.

- Waterproofing for the water impact classes W1-E / W2-E
- Water pressure from outside in the Remmers system without a reinforcement insert
- Installation depths > 3 metres into the ground

- On salt-loaded subsurfaces
- Water pressure from outside
- Excellent surface and adhesive bonding
- Higher sulphate resistance

- Injection against capillary rising damp pressure-free up to 95% degree of moisture saturation
- Alternatively in the low-pressure procedure
- WTA-certified pursuant to information sheet 4-10/15