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Everything You Need To Know About Rendering Exterior Walls

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By Author: Andy Guy
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Rendering is the process of applying a cement mixture to external walls for a number of different reasons. The finished surface can have a smooth or textured appearance according to one’s wishes, and the technique is similar to that of plastering an internal wall. There are several different types of render containing different ingredients and the type used in a particular set of circumstances will depend on the situation. This will be affected by the geographical situation, the weather experienced, and the composition of the building itself that is to be rendered. 

The main components of render are cement, sand, lime gypsum, and water, but they can be mixed in different ratios. There are also different grades of sand, and a coarse sand may be used for a scratch coat, while a finer grade known as a plastering sand would be used for a top coat. A scratch coat has slightly different meanings in that it can refer to a base coat which is then scratched using a hand tool in order for the top coat to adhere to it better, or it can also refer to a top coat which is scratched in order to produce a decorative effect.

Render can also have additives added to it such as acrylic. This is a type of plastic and is added in the form of acrylic resin, and the resulting render is known as acrylic render. Typically, it is provided in pre-mixed tubs, and it means that the finished render has a certain amount of elasticity which makes the render both water and stain resistant.

Acrylic render is often used on properties that have required work done on them and as a result do not look aesthetically pleasing. A single coat of acrylic render can last for 20 years or so but is less tough than some other renders: in a particularly cold or wet environment it may have a shorter life span than others. It may also take longer to dry in this sort of environment.

Another disadvantage would be that if it is applied to a wall which needs to breathe, an acrylic render won’t allow that as it is impermeable. A different formula would be required.

This could be in the shape of flexible synthetic silicone render which is ideal for coastal properties as it is resistant to harsh weather - not that Bournemouth suffers from severe weather for most of the time - and is also breathable. This type of render can last for as long as 50 years even if only applied in a coat 1mm thick. Because of the silicone additive it is resistant to cracking as well. A silicone render is also supplied ready mixed and is available in a choice of over 20 different colours. It is easy to apply and is becoming the render of choice for many installers.

If you want to apply a scratch render in Bournemouth, the first thing to do is to clean off the wall and ensure that it is free of any moulds and loose bits of concrete or mortar. Then you apply the first scratch coat to the ideal thickness of about 2mm, making sure that the wall is covered evenly. Then scratch the wall in an even vertical pattern with a scratch tool or scarifier. Let the coat adhere to the wall before applying the top coat.

The top coat is applied to a thickness of about 10mm, ideally. It should adhere to the first coat to the point where it won’t be marked when you touch it but is soft enough to be scratched by your fingernails.

After that you use a scratch nail, which can be of different sizes depending on how rough looking the top coat is to be, scratching the wall in a circular motion and scratch evenly across the whole surface area.

UK Spray Rendering can install any type of render to your property and can produce a really great-looking scratch render in Bournemouth that will amaze your friends and visitors. The finished product will not only make your home or office stand out from the rest but will also mean that you do not need to undertake any form of maintenance for many years.

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