Learn the Basics of Render Construction

Rendering Perth is a cement mixture that can be applied to exterior walls to achieve smooth or textured surfaces. It typically contains sand and lime, with the addition of lime making it more elastic and less likely to crack after drying.

Render can increase a building’s value by offering insulation and protection against weather elements. However, the render must be correctly mixed and applied to ensure a long-lasting finish.


Render is a mix of cement, sand and sometimes lime that is applied to walls to weatherproof them, cover them or change their appearance. It is a technique that requires some skill and plenty of practice, but with a bit of time, it is possible to learn how to render walls yourself. Before you start rendering a wall it is worth spending a few days practicing on a piece of platerboard fixed to the wall of your garage or shed. It will save you a lot of time and effort in the long run. Once you have got the hang of it then you can apply a mock-up render to your wall to get an idea of how it will look once completed.

The scratch coat is the first layer of render that you will need to apply and provides a base for the subsequent coats. It should be a minimum of 10mm thick, but can be much more if desired. The scratch coat should be a smooth finish and you can use a plasterers steel float to achieve this. The mix for the scratch coat should be six parts sand to one part cement, and it is recommended that you use a hydrated lime such as Blue Circle Hydrated Lime from B&Q.

Once you have a satisfactory scratch coat you can then begin applying the second coat. You should start at the bottom of the wall and work your way up, ensuring that it is even across the whole surface. The second coat should be built up to around a maximum of 10mm in thickness and can then be levelled using your float again.

When you are applying the second coat, it is important to leave a slight ridge between the surface and any bricks or blocks on the face of the wall. This will stop water from pooling on the face of the wall and causing moisture penetration problems.

Once your second coat is dry, you can then use a textured tool such as a scratching comb to create a textured finish on the surface of your render. This will provide a key for the subsequent coats of render, enhancing the strength and durability of the overall system.

Render is a coating that can be applied to brick, stone and concrete walls. It is used to protect buildings from the elements, such as wind and rain. It also adds to the visual appeal of a building. It can be painted any colour you like and can also act as a deterrent for people who would try to break into your home.

Typically a render mix will include lime, sharp sand and cement. The addition of the lime allows the mixture to dry quicker and prevents cracking. It is also easier to work with than a normal mortar mix.

A trowel is used to apply the render and achieve the desired surface texture. There are a variety of trowels available, including a brick trowel and a mason’s trowel. These types of trowels feature different blade shapes and are designed for specific tasks. A tuck pointing trowel is a long and thin tool that is used to spread mortar in tight spaces between bricks.

Its uses don’t stop here though; the trowel can also be used to smooth out freshly laid concrete and to bring water to a surface. The trowel can also be used to mix the render, which is a process called ‘batching’. This makes it easier to work with, as it helps the material become a soft, putty-like consistency that can be easily applied to the wall.

When a plasterer mixes the render, they are looking for a consistency that is between a paste and a stiff slurry. This will ensure that the material can be spread evenly across the wall. They will add a certain amount of water to the mix to make it easy to spread. They may also use bonding agents and additives to help the render dry more slowly.

Once the base coat has been applied and is set, a top coat can be added. This can be achieved using a trowel, brush, hessian bag or sponge. A hessian bag can be rubbed over the final coat to produce a textured finish or a pattern. A sponge can also be used to create a stippled effect.

A straightedge is used for making precise lines and shapes. It is an essential tool for any renderer to have, especially when using a float or trowel to create more detailed finishes. You can find straightedges of different lengths at most hardware stores. Choosing the right length is important for your project, as it will ensure that you get a clean line and avoid any unnecessary cracks in the render. A longer straightedge is also useful for projects that require a larger surface area to be covered with render.

Rendering walls can be a great way to freshen up the look of your home without having to replace the brickwork. It can also provide protection from damp or weather damage and boost a building’s insulation value. However, you should be aware of the potential downsides to rendering your house, particularly when it comes to cost and profitability.

Whether you’re aiming for a modern or traditional aesthetic, the design options available with render are endless. It can be smooth or textured, fine or coarse, natural or coloured using pigments, and can be applied with a variety of tools, including sprayers, trowels, sponges, combs and rakes.

The process of preparing the wall before applying a render is an important stage in any project. If the surface is not correctly prepared, it will be susceptible to a range of problems, from moisture intrusion to flaking and cracking over time. To minimise these issues, it’s crucial to prepare the surface with a scratch coat before rendering and use an appropriate basecoat to help it adhere.

Cement render is typically mixed on site before being applied in a number of coats. It’s usually a good idea to choose a mix that’s formulated for your type of building or project, as this will improve the quality of the finish and durability. You can also buy through-coloured render mixes, which will eliminate the need for repainting.

Unless you’re working on an older property, you’ll usually be able to carry out a simple render update without the need for planning permission. More extensive work, however, may need to be agreed with your local council.

Render is a mixture of sand, lime and cement which can be used to decorate walls and give them either a smooth or textured finish. Pigment can also be added to render to provide a coloured wall finish. Render can be applied to walls both internally and externally. A variety of tools can be used to further manipulate the render to create a specific aesthetic.

When renovating a lime-rendered surface, it is recommended that the scratch coat is roughed up to aid adhesion and to allow the fresh re-render to “stick”. A rough brush is available which has a number of wire bristles that will give the wall a textured surface and ensure the new coat is well adhered.

The bare block surface should be thoroughly cleaned to remove any dust or debris that may have built up on the walls prior to commencing rendering work. A light misting of water may be necessary to ensure the walls are dry before the render is applied. Movement joints should be left intact where possible and provision made for stainless steel stop beads to prevent render from bridging these joints.

Traditional lime render is often a two coat system with a scratch coat on the base to ensure that the subsequent coats of plaster adhere, and a final top-coat which is decorative and can be worked by trowel, sponge or brush to achieve a specific finish. The thickness of the scratch coat bas,e, and final coats should be specified by the render manufacturer in their literature.

The first scratch coat should be a very coarse grained sand, this will aid in the bonding of the render to the wall. A wavy ‘serpantine’ scratch finish is more effective than a straight horizontal or vertical one, as the serpantine pattern better dissipates stresses that are caused when the render and the underlying block background dries and shrinks at different rates.

A sand/lime mortar mix without air entrainment is preferred, the addition of an admixture to provide additional strength to the mix should be considered if the surface to be rendered has a high water demand. A pre-treatment or raking back of the mortar joints is recommended on paint quality blocks such as