Rendering Options

Rendering explained

What is the difference between monocouche and silicone renders?

Monocouche is dry powdered render which has a coloured pigment added to the mixture as well as other aggregates. Monocouche render provides reasonable breathability and generally a very popular rendering system. The natural microporosity allows an excellent flow of the thermal pressure generated by the heating of the facade. The microporosity of render is an advantage, but also a drawback due to the relatively high water absorption which could be dramatically reduced with the help of silane – siloxane based render sealer.

Silicone renders – modern generation of facade renders with binder being based on silicone resins and polymer dispersion. This type of finishing coat, gives properties such as flexibility, hydrophobicity and vapour permeability.

Silicone render is one of the most modern generation of facade renders. Its formula guarantees high vapour permeability or breathability as well as water resistant protection to withstand aggressive environmental agents, in harsh weather conditions. This type of render has an excellent resistance to UV rays and ageing together with a very low dirt absorption. The excellent workability combined with good surface adhesion, excellent filling makes it an ideal decorative render solution. Manufactured in the form of a ready-to-use colour paste that can be used straight after mixing.

Monocuche is a one-coat, weather resistant, breathable, through coloured mineral decorating render for external use, suitable for most types of traditional masonry brick, blockwork or concrete. The product allows to protect, smooth and decorate, surfaces maintaining good breathability of walls. This product is designed for mechanical projection by diesel and electric machines or hand application. It is typically available in a wide range of different colours and can be finished in a range of textures such as scraped, light sprayed, sponged or float finish.
Silicone Render
Fibre-reinforced decorative render with paste consistency for exterior use. Its special formula guarantees maximum wall breathability and water resistant protection to withstand aggressive environmental agents, in all weather conditions. The product has excellent resistance to UV rays and ageing together with a very low dirt absorption. The excellent workability combined with good surface adhesion, excellent filling and smoothing powers; make it an ideal decorative render coating for new house rendering, old render renovation, flexible render over insulation systems, etc. It is typically available in three different sizes: 1.0 mm, 1.2 mm and 1.5 mm and very wide range of colours.

How to improve water repellency of external render?

A building’s business card is the façade and a dirty or damaged façade leaves a bad impression not to mention the building will depreciate as damage weakens the building’s fabric. One of the most serious problems for facades is water, whether it be in the form of liquid, gas or frost, water is a natural rival to mineral coatings and renders. Mineral building materials have a strong tendency to absorb water due to their porous surface structure, be it rain or damp, from both the inside or the outside of a building.

This damage comes in many different forms but there is usually one simple remedy for all: preventative protection via hydrophobic impregnation. A dry façade will promote the reduction of energy costs and a façade with hydrophobic protection will have lower maintenance and repair costs. The façade is easier to keep clean and the value of the property is increased while heating costs are reduced.

Hydrophobic coating reduces water intake by approximately 80%, maintaining the thermal insulation performance of the wall at a constant high level and the hydrophobic sealers such as Vimark® VIMASIL ACQUA maintains water-vapour permeability, ensuring that there is nothing stopping moisture from escaping through the wall, helping to create a healthy indoor climate.

Surfaces treated with Vimark® VIMASIL ACQUA maintain render breathability, because the surface pores of the render are not blocked by water-repellent agents based on organosilicon compounds which means, water in liquid form can no longer penetrate the capillaries that have been rendered water-repellent because a polar liquid is unable to interact with a non-polar hydrophobic surface.The hydrophobic primer Vimark® VIMASIL ACQUA combines high technical performance with ease of application.


  • Reduces capillary water intake by at least 80%.
  • Protection against rain and humidity thanks to a low capillary water intake.
  • A hydrophobic coating reduces water intake, without reducing water-vapour permeability

  • Extremely durable water protection thanks to:
  • High depth of penetration
  • Alkalis resistance
  • UV stability

  • Low water intake
  • High water-vapour permeability
  • Barrier against harmful water-dilutable salts
  • Extremely resistant to cold, heat and UV light

How much would it cost to render a house per square meter m2?

There are number of reasons why house owners choose to render their properties. Render provides a decorative finish that can brighten up tired houses, especially those with damaged brickwork or existing discoloured render. To get an idea of costs, multiply the number of  square meters of the property type you are looking to render by the cost of installation in your area of your chosen type of render.

Estimate how much does rendering cost per square metre in the UK:

Small mid-terrace house = 40-50m2

Large mid-terrace house = 70-170m2

3 bed semi-detached = 110-160m2

3 bed detached = 110-160m2

4-5 bed detached = 180m2+

While the cost of render is comparably not expensive, the work needs to carried out by approved renderers. If you live in a traditionally built property with solid walls without a cavity, you’ll need to get a price from a specialist renderer who understands the importance of breathability.

Monocouche is modern through-coloured render which provides a decorative, weather-proof finish for external walls. Unlike render covered with paint, it does not show scratches and therefore stays looking newer for longer. One finishing layer is installed on top of a base layer, you don’t need to paint the surface.

South: £45-60 per square metre

Midlands: £35-50 per square metre

North: £35-45 per square metre

Silicone or Silane Acrylic –they are more expensive because they are flexible, meaning they will move with the building and not crack. Also, silicone stays cleaner for longer so it will keep your render looking new. Like the Moncouche, this is also a “through colour” so no painting is needed, just a wash every few years or so.

South: £50-65 per square metre

Midlands: £45-55 per square metre

North: £45-55 per square metre

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