Rendered façades

Weather protection and design options at the same time

In earlier times, render was a weather protection that could also be used to cover different materials and achieve visual uniformity; later, render was and still is chosen primarily because of its versatility and the wide range of possible applications.

In addition to their natural colour, renders can be given a colour finish in any shade, either with a final coat of paint or with pigments. In addition, plaster can also be used for sculptural and ornamental decoration on façade surfaces. The ageing of a render façade is a complex process. Rain and condensation, the absorption and release of salts, and thermal stresses gradually attack the façade. This results in cracks, flaking paint coatings, crumbling of the render and even detachment of render and paint layers. Particularly at risk are darker areas, changes of material, plaster features such as cornice and fascia strips, as well as coatings with varying expansion behaviour and sealing properties.

A rendered façade can be maintained for a long time through good workmanship and constructive measures such as roof overhangs, water hammer edges, stone plinths and, above all, regular maintenance.

Preservation and reconstruction of rendered façades

Re-rendering weathered substrates

Durable special renders designed with the building in mind

Buildings change constantly. Over time, dirt and air pollutants accumulate on the façades. Moisture creeps in. When it is time for refurbishment, the façades are usually cleaned, but this is generally not enough. Over the years, salt has built up that resists cleaning. If the render is renewed in such cases, the undercoat and topcoat should be formulated in such a way that they can withstand this potential for damage for as long as possible. Remmers renovation render systems are ideally suited to the task.
The permanently water-repellent yet highly diffusible renovation render allows the masonry to dry out, but retains the salts so that efflorescence does not occur. If a large amount of salt is present, the substrate can be levelled with a pore undercoat render, which allows the salts to crystallise without causing any damage.
Alternative, Remmers compress render can be used to eliminate damp while maintaining diffusibility and capillary action. It ensures permanent moisture regulation and, with a pore volume of over 60%, offers ample space for the storage of salts.
Stucco replacement and repair

Stucco elements give façades a special look. They embody exquisite and traditional craftsmanship. Building façades decorated with stucco characterise many historic cityscapes. However, stucco is not just used to refer to the opulent sculptural flourishes of the Baroque and Rococo periods, but also to simple cornices, window jambs, pilaster strips and the like. When producing stucco, a distinction is made between traditional moulding on site and prefabricated stucco profiles and ornaments made in the workshop. Remmers has solutions for both production methods that meet all the modern requirements for workability, speed and durability.
Refurbishing old rendered surfaces

Often it is not necessary to remove old render completely, even if it has a crack or two. In such cases, it has proven successful to recoat the façade with thin-layer plasters. To prevent existing cracks from reappearing, it must first be checked whether the causes of the cracks are still active. If this is the case, they must be remedied before rendering.
To increase protection against the recurrence of cracks, a reinforcement in the form of a glass fibre fabric is incorporated into the renovation render system. The combination of Remmers VM Fill as reinforcement render and Remmers VM Fill rapid as feltable finishing coat render has been used successfully for many years to repair cracked rendered façades. If the render is not cracked but simply has a damaged, weathered and unsightly surface, Remmers SP Top Q2 can also be used for refurbishment as an alternative to VM Fill rapid.
Historic rendered and plastered façades

The use of traditional materials and application techniques is one of the basic premises in the restoration of listed buildings. As long as no excessive salt and moisture effects are expected, the use of traditional materials, up to and including the property-specific reproduction of the historic formulations, is the primary restoration goal.
With the Remmers Historic Mortar system, old mortar compositions can be recovered. This is true for almost all types of historical formulations, from dry slaked lime mortar to natural cement mortar, and from classical stone renders to mid-20th century crushed brick concrete. We create formulations on the basis of individual case-by-case analyses and our many years of experience from 75 years of active involvement in the preservation of historical monuments.
In this way, we make our knowledge available to all those who want to counteract the loss of historic plaster textures and formulations and the associated loss of historic mortars.

You can find more information in our brochure “Building conservation and monument preservation”.

More info
Coating systems on render

In addition to providing a colour finish, façade paints also have a protective function for the building. This essentially consists of keeping moisture and thus pollutants away from the building and at the same time maintaining its diffusibility to a sufficient degree. These tasks can be achieved with two different paint types. Classic silicate and mineral paints such as Remmers Color SH impart a sense of high-quality design and resilience. This is down to the use of water glass as a mineral binder, as well as the wide array of impressive architectural monuments on which these paints have been used, in particular those of the early modern period. The outstanding properties of silicone resin paints such as Remmers Color LA and Color LA Fill, the filling version, are based on their microporous structure.
These can be seen in their characteristic values. They achieve a diffusion resistance coefficient of around 150. This corresponds to an sd value of well below 0.10 m and comparable to the commonly used single-component silicate paints. At the same time, the capillary water absorption of such paints is extremely low. This means that they provide a “Gore-Tex” finish for the rendered façade. What makes for optimal outdoor clothing is also perfect for façades. Silicone resin-reinforced acrylic dispersion coatings such as Color SF [basic] combine the advantages of high-quality dispersions made of pure acrylate with those of silicone resin emulsions. More specifically, the typical product characteristic values for pure acrylates and the resultant properties of film-forming, excellent adhesion, colour brilliance, UV resistance and wear resistance are combined with those of silicone resin emulsions – namely their water-repelling capability, optimum water vapour permeability and low tendency to accumulate dirt.
By combining these different binders, excellent property profiles can be achieved. For pure renovation coatings, on the other hand, binder-optimised and filler-enriched acrylate paint coatings such as Color Sil [basic] are suitable. Color Sil [basic] adheres very well, dries with little tension and boasts high resistance and durability.

Brochure – Brick and render façades

Our comprehensive brochure on brick and render façades contains all the facts to help you find durable, individual solutions for your project.

More info

References

Notre-Dame de Paris Cathedral (FR)

SuperHub, Groningen, the Netherlands

Spiral staircase, Rapunzel Naturkost, Legau, Germany

go to references archive

Rendered Facades

33 products found

AGE

Article No. 136801

BFA

Article No. 067305

Bactericidal, fungicidal and algicidal combination product for cleaning and priming building materials with and at risk of green discolouration

CL Levell Historic

Article No. 057525

Specially formulated undercoat render

CL Prep Historic

Article No. 057420

Specially formulated rough cast

CL Top Historic

Article No. 057625

Specially formulated render finishing coat

Clean FP

Article No. 066601

Cleaning paste for removing urban dirt

Color LA

Article No. 640005

"True" silicone resin paint with film protection for surfaces prone to algae and fungi

Color LA Fill

Article No. 056010

"True" silicone resin paint with filling properties

Color LA Fill Historic

Article No. 647105

Semi-translucent, filling, “true” silicone resin paint

Color LA Historic

Article No. 647605

Semi-scumbling, "true" silicone resin paint

Color SH

Article No. 063013

Mineral paint with fine-grained texture

Diagnosekoffer für Mauerwerkss…

Article No. 495301

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Façade restoration - render façades