Devon Builders Articles: The Beauty of Cement Render

The Builders SW TeamRendering, RenovationsLeave a Comment

Many properties that come under the work of our Torquay, Newton Abbot, Exeter and South Devon builders are of the Victorian type. In many cases, the properties will be finished with a cement render. In fact, rendering has been used for many years to improve the look of a property and to add weather resistance and insulation. Cement rendering involves applying a ready mixed coating of sand and cement to the external walls of a property. The render coating may be textured, infused with a particular colour or white, which can be painted once it is dry.

The render can be in various styles, depending on the taste of the individual property owner. Some people prefer it to be fine and smooth whereas others prefer a course, more textured finish. These different finishes are achieved through the employment of a variety of tools, including sponges, brushes and trowels. The final finishing effect is achieved by either applying a thin finishing coat or by what is known as a finishing wash.

The Rendering Process
The most important step, when rendering the external walls of a property is to ensure that there is proper adhesion. Initially, this involves hosing down or otherwise cleaning the surface that is to be rendered to make sure that there is no loose dirt, debris, mortar or other particles that will interfere with the ability of the render to adhere to the wall. If there is any existing render or the wall has been painted, the wall should be thoroughly scrubbed to remove all traces. The clean surface should then be scraped to further enhance the adhesive quality of the wall. If the wall is large, the renderer will frequently attach evenly spaced battens to the wall. This procedure assists in ensuring that the final finish it flat and level. A cement render mix generally comprises six parts of sand to one of cement and one of lime. It is important to add the lime because this makes the render more malleable and also reduces the incidence of cracking as the render finish dries. The preferred cement is Portland cement. As we will see below, other additives are available to assist in adhesion, add colour and provide insulating quality. The render is normally applied in two separate layers. For the first of these, a coarser sand is used whilst, for the final, top coat, a finer sand is employed.

Devon Builders

A Rendered Wall

Special Types of Render Mix
There is a wide range of ready mixed renders covering a variety of situations. Some of these contain a polymer additive, which provides additional water resistance, strength, flexibility and adhesion. What many renderers like about these ready mixed acrylic renders is that they can produce a smoother finish than the more conventional render mix. They also provide a range of different finishes, including stipple and smooth and dry far more quickly than conventional render.

If you have a property that is already rendered but is looking tired, if you would like to improve the appearance of your property’s exterior or wish to insulate your external walls, the application of a new render coat is what you are looking for. At our team of experienced professional Torquay, Newton Abbot and South Devon builders will be happy to visit and provide a free no-obligation quote for the rendering work on your property.

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