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Some Of The Many Types Of Render Which Can Be Applied To Walls

By Author: Andy Guy
Total Articles: 3

There are two chief reasons for applying a render to the exterior walls of a building and these are to protect the wall from the effects of weathering and rainwater penetration, and simply to provide an attractive appearance to the outside. This can have the effect of making a building which has seen better days look brand new again.

Today there is a wide choice of different renders made up of different component parts in order to perform a variety of functions. One of the traditional types of render is lime render. It has a tendency to be somewhat harder to apply than traditional cement render, meaning that it is most commonly used in conservation work. However, there are now a couple of lime renders on the market which have polymers added which make it easier to apply.

Lime render is more flexible than cement render and therefore less likely to crack. One big advantage is that lime render is breathable so it is a must for period properties in order to avoid problems with damp. This can often be a problem if cement renders are added to an old wall. Lime render looks very attractive, but it will need regular coating with lime wash every two years or so.

Another traditional form of render is cement render. This is usually mixed on site in a cement mixer and applied in two or three coats, the base coat being a “scratch” coat, as it is scratched and scored in order to provide a good key for the next coat. The first coat or two are applied quite thickly, with the top coat being thinner and smoothed ready for painting. Cement is a fairly cheap material, but is more labour intensive than some other renders. It also has a tendency to crack if the building moves, and if it is going to look its’ best will need ongoing repainting.

Monocouche render is normally sprayed on and applied in one coat, the term “monocouche” being French for “single layer”. Oddly enough, if it is applied by hand it is usually applied in two coats. It comes ready mixed and is through-coloured in a choice of colours. Monocouche is quick and easy to apply, and it also dries quickly.

Another type of render is flexible synthetic silicone render which has synthetic silicone added to it. This has several advantages, not the least of which is that, as the name implies, it is flexible which means that it resists cracking, even if there is movement in the building. It is also seriously weatherproof so is ideal for use in any exposed conditions or in the salt air at the coast.

In addition, flexible synthetic silicone is breathable, so it can be used on a wall which needs to be able to breathe in order to avoid any damp problems. It can also be applied in thicknesses of as little as 1mm which can save a lot on material costs.

Then there is acrylic render in Banbury. This is a render to which acrylic resin has been added, which is a type of plastic and makes the render totally waterproof and stain resistant. However, it does have the property of not being breathable which means that you can’t use it on a wall which is liable to suffer from condensation internally.

Acrylic render does have the advantage of being able to be applied in one coat, so when you take labour costs and the cost of materials into account, it is probably the cheapest type of render that you can get.

UK Spray Rendering is the leading supplier and installer of wall rendering in England and Wales and can apply any or all of the renders mentioned in the article, including acrylic render in Banbury. With eleven branches, the company can apply rendering anywhere in the two countries and is happy to come out and advise on the most appropriate render for any given situation.

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