External Rendering is often the final touch that will finish off new builds or provide a face lift to an existing property. Rough or smooth finishes both offer their unique sealing and cosmetic properties and if undertaken carefully and professionally, will add value to your property. In a similar process to plastering, rendering is a job that requires high level skill and practiced trades people.
Details of a typical rendering job are listed below.
Preparation For External Rendering – Unless the wall has been recently built, ATC will need to remove any debris or loose dirt – remove any plants growing up it, scrub off any mould with a bleach solution, and hose down the wall to remove any dust and dirt that could stop the render from adhering.
External Rendering Mixes – Our equipment, including mixer, sand and cement will be as close to the work as possible. External rendering can be undertaken all year round, but in Winter, if it is likely to be very cold in the evening, with even a hint of frost or ice, then the work must be covered (preferably by hessian sacking or even a blanket) to stop the water in the render freezing. If it is allowed to freeze, it will expand. On thawing it will leave a void which will again fill with water when it rains. We will always take great care to prepare for seasonal adjustments.
Applying The First Coat Of External Rendering – If there is a wide wall to render, setting up screed battens would be recommended – these can be 10mm thick wooden battens, which fix to the wall. We would place them about 900mm apart, and make sure the screws are flush with the face of the timber because we will be using these battens to help you level the render. These battens serve to divide the wall up into more manageable portions, and also gives a starting point to gauge how thickly to apply the render. Scratching the surface of the first coat enables the second coat to bond – plasterers will use an over-sized comb type tool for this. The second coat can be applied after a few hours of the first.
Applying The Second Coat Of External Rendering – Applying the top coat of render in the same way as the first one, but not as thickly – it should be about 6mm thick. We would either set up battens again or do this free-hand depending on the specifications of the job. Using a straight-edge to level the render again, filling in any gaps, and then finish it with a wooden or plastic float.