28/04/2021 by WPS Plastering Contractors Ltd 0 Comments
Different Types of Render Systems
When asking for a rendering system to be installed on the walls of your home, there will be some choices to be made. The first is the type of rendering system you will want. This short guide will help you understand the different rendering systems on the market to help you make the right choice for your home.
Monocouche or scratch renders are a decorative cement based render that is pre-bagged and pre-coloured. Scratch render refers to the technique used to apply the render whereby it is applied on around 18mm thick and is then scratched back to create the overall finish of around 15mm. The term monocouche is a term to describe modern renders and differentiate it from the traditional render of sand and cement. Monocouche is actually a manufacturers name however the industry refers to most of these as monocouche or K-Rend. There are around 12-24 colours available to choose from depending on the manufacturer used.
Thin Coat Renders
This is a wide category whereby the render is applied in multiple layers but the overall thickness is thinner than that of traditional or scratch renders. Typically these renders can be applied to a thickness of 6mm or above. Depending on the surface the render is being applied to we will complete the following steps;
1. Preparation of the walls - pre-wash or applying a cement or insulation board
2. Basecoat - apply a basecoat which is reinforced by embedding an alkaline mesh to not only strengthen the render but to help to prevent cracking of the render.
3. Finish - a decorative finish is applied. There are a number of finishes available including the following;
Dash - This is a system where dry aggregates are thrown onto wet render to create the finish. There are a number of colours and different sized aggregates that can be used and can a cheaper option than other finishes.
Silicone - .A high performance through coloured render finish which contains silicone in the pre-mixed pre-coloured bucket. The silicone gives this product a stain and water resistant covering and helps to repel pollutants, alage and staining from sticking the coating. In the unlikely event a stain does occur the rain should remove this but otherwise a minimal maintenance maybe required to remove this. This is lightweight product which is flexible and can withstand slight movements from a building without cracking. This finish is breathable and ideal to be used on insulation or cement boards and for buildings that require a breathable system. Silicone has two textures
available one in a textured finish or a rolled corrugated finish and is available in almost any colour on the market as all buckets are coloured to order.
Acyrlic - A high performance through coloured finish which contains acrylic resin (a type of plastic) and is pre-coloured. It offers a stain and water resistant covering
which also helps to prevent cracking. However, this does have its limitations from the Silicone finish. Due to the plastics it is unable to allow a building to breathe and therefore can not be applied if the building or the insulation needs to be breathe. It can not be applied in cold or wet conditions as it takes longer to dry. Unlike the silicone finish it will require maintenance as it is not as resistant to pollutants and algae in the same way as the Silicone finish. This is also available in two finishes, textured or rolled/corrugated and is available in a wide choice of colours.
Brick Slips - Where a client wants their house to be rendered but would like a more traditional finish, brick slips can be applied as a finish coat. These are either extruded from bricks or are synthetically made. There are a wide choice of colours and textures on the market from most manufacturers, however we do work with some manufacturers who now offer a brick matching service creating authentic looking bricks. These are stuck on and then pointed afterwards.
Brick Effect Render - A slightly cheaper option for a brick finish is to use brick effect render. In essence the mortar coat is applied first to the surface and then the brick coat
is applied on top, before this brick coat dries it is scored to create the bricks and to exposure the mortar coat underneath. There are a number of colours available but are monotone in their appearance compared to brick slips. This is a lightweight system allowing it to be applied on top of cement boards and insulation.
Stone Effect Render - These are popular when wanting to create or re-create a stone feature or even a full house to look like stone. As its lightweight it can be applied onto insulation and has the same properties as the brick effect render.