Tag Archives: render

Where can I find an EWI installer in Birmingham?

Looking for renderers in Birmingham? Here at EWI Store, we understand the importance of having a warm home to come back to after those dark and chilly winter days. Homeowners can unwittingly lose up to 50% of heat through their walls, effectively heating the outdoors.

It’s important that when you are considering an EWI installation, you have a reliable and professional installer at hand to provide a great quality of service. We have a list of approved installers who have undertaken our specialist training course, and who we can put you in touch with. If you are a homeowner looking for EWI installers or renderers in Birmingham, Wolverhampton, or the surrounding West Midlands, then Thermal Render Solutions are the installers for you!

By installing EWI (external wall insulation) you can achieve three main things:

  • Keeping your home warmer in the winter, and cooler in the summer.
  • EWI can halve your heating bill (using less energy: helping the environment).
  • Improving the overall look and energy efficiency rating of your property, and therefore potentially increasing its value.

Installing EWI isn’t a small job, and a trustworthy, experienced installer is an essential factor towards achieving a positive outcome.

EWI in Birmingham – Who are Thermal Render Solutions?

Thermal Render Solutions are a highly commended company based in Wolverhampton, providing external wall insulation services all across the West Midlands and surrounding counties. They provide homeowners in Birmingham and the West Midlands with the best quality BBA (British Board of Agrément) approved EWI, sourcing their products directly from us here at EWIstore.

With almost twenty years’ experience as EWI installers, your home is in safe hands and Thermal Render Solutions can guarantee you a great installation job. Keep reading to see some of their fantastic before and after installation photos below!

If you are based in the West Midlands, a number of EWI services are available to you with Thermal Render Solutions, including:

  • External wall insulation
  • Through coloured render (monocouche)
  • Mesh reinforced crack resistance render
  • Weather-resistant nanoxil render
  • EWI/render surveys, inspections and repair advice

Are Renderers in Birmingham improving the appearance of homes?

Birmingham has a largely industrial past, and as a result has expanded over the years into a vast metropolitan city. Due to heavy air raid attacks during WWII, Birmingham has also been historically associated with the ‘concrete jungle’ look arising from the post war housing crisis.

When it comes to domestic properties, this means that EWI will benefit your home in numerous ways: by improving thermal comfort, saving internal floor area (essential for spatially smaller city properties), insulating against city noise (road traffic etc.) and enhancing external appearance.

Thermal Render Solutions have worked as renderers in Birmingham and have installed EWI on many different Birmingham homes. As a result, Thermal Render Solutions have contributed to the improvement of the city’s outlook, with customers reporting a noticeable difference to their home.

Renderers in Birmingham – What kind of render is best?

Living in a city means choosing a render that will resist getting dirty from the pollution and traffic. Currently, our top of the range thin coat render is our silicone render, and it’s perfect for the city environment. This is because silicone render not only offers unsurpassed breathability and vapour permeability (it will allow water vapour to escape through it, thereby preventing damp), but it also offers self cleaning properties. This means that the silicone render will stay looking clean and fresh for years to come!

If you’re looking for a slightly lower price point for render, then you can’t go wrong with our silicone silicate render. It’s our most popular because it is a hybrid silicone render. It maintains the same level of breathability and vapour permeability and offers a slightly lower level of self cleaning than pure silicone render. It’s a great one to choose because it’s a real all-rounder and performs excellently at a great price.

If you are interested in EWI Pro external wall insulation and render systems, then give Thermal Render Solutions a call on: 01902 686283 or 07507 893222 you can view some of their completed installation jobs by scrolling down to the pictures below.

Alternatively, if you are looking for a free quote on EWI materials, then you can fill out our materials calculator here. Our sales team are all experts on our products and would be happy to provide you with any technical information that you require.

Stay tuned for more content! We upload blog posts every Tuesday and Thursday all about EWI and render.

Render in Birmingham – Before and After Photos

What is Mineral Render? EWI Pro Coloured Renders

So, you’re looking to re-render your property, and whilst looking at our selection of renders you are unsure as to which render is the right choice for you. Well, this is understandable because all of our renders have different properties and therefore can offer you different things at different price points. Allow us to help you by shedding some light on the wonders of our Mineral render

Mineral render is a popular render choice for EWI and render-only systems that are going to be installed in colder climates. It’s a dry-mix finish and is our fastest drying render – therefore it’s a better choice for you if you live somewhere blessed with cold and rain every other day (Scotland, Wales… we’re looking at you). As long as the temperatures are above freezing, you can still go ahead with installing your mineral render without problems – which reduces so many complications for both the installer and the homeowner.

Mineral render comes in a variety of different grain sizes – so it’s great if you want a more customisable render finish to suit your tastes. If you are familiar with our silicone render  (you can read our blog post all about silicone render) then it can basically give you the same result as this (except without the silicone, and it’s cheaper), because Mineral render is a thin-coat render, so it still allows for breathability, flexibility and resistance to cracks. The breathability of Mineral render is also great for if you are installing a Mineral Wool external wall insulation system, because Rockwool is highly breathable as well.

Mineral Render and Silicone Render Paint

However, a lot of people can be put off by the fact that the Mineral render needs painting after it has been applied to the substrate. This does rack up the price – although mineral render is less expensive in the first place, so it can balance out somewhat.

Mineral render needs painting with a render paint because when it has been left unsealed it is susceptible to lime bloom (otherwise known as efflorescence). This is because Mineral render contains Portland cement. Lime bloom occurs in white patches and discolouration where “lime” (calcium hydroxide) settles on the surface of the render due to a chemical reaction. This can cause the formation of crystals on your render which can damage the system.

To combat this, we recommend that once dry, you immediately seal your mineral render with our EWI-005 Silicone paint, because silicone offers hydrophobic properties which will further protect your render finish. This also means that the external finish of your property will be more low maintenance, because silicone resists organic growth – so you won’t have to keep washing the property.

Although having to paint the render after installation can be more time consuming, it can actually be a good thing because silicone paint can be layered. Therefore, if you wanted to brighten up the property or change the colour of your external finish further down the line, then you can easily just paint over it again.

How to apply Mineral Render

Because mineral render comes as a dry mix, it needs combining with water before application. You can do this using a mechanical mixture or manually with a paddle mix. The render is then applied to the substrate using a Notched trowel. Usually, you’d apply your render to the same thickness as the grain size – so if you went for a 3mm grain size you’d apply the render at a thickness of 3mm.

So, once you’ve applied the mineral render it should take roughly 12 hours to dry (depending upon the conditions). After that, you are free to use the Silicone paint to seal it! You can apply our silicone paint with a spray machine, a roller or simply by using a paint brush.

Why Choose EWI Renders?

Here at EWI Store, we prioritise providing our customers with the best quality products on the market. We are confident in the abilities of our renders to deliver fantastic results, so you can be sure that they will meet your expectations!

applying render to timber frame property

Applying Render to a Timber Frame Property

Timber frame properties and EWI

Timber-frame properties are constructed of heavy-weight timbers which are used to form the building shape and are then fitted together to create joints. This building method is most prominent in cold climates and has been around for thousands of years. An added bonus of timber construction is that as long as trees are planted in place of the used ones, timber construction can be very green and environmentally friendly. So, pair this with an EWI system and you can count yourself as doing your bit towards the environment!

Timber frame structures are built to be tightly sealed against water and moisture and are built as part of a dry construction process where once weather-tight, the timber needs to dry out before the walls are further constructed.

Timber frame houses, however, do heat up and cool down much faster and aren’t as naturally energy efficient, so insulation is very necessary. These days, timber frame houses are constructed with wall boards backed with aluminium foil, but this is difficult to do if you live in an already-built, older property. Insulation is also vital to timber frame properties because damp and mould can be detrimental to the structural integrity of the building.

External wall insulation is perfect for timber frame houses, as cavity wall insulation is an immediate no-go zone when it comes to timber frames. Read on to find out how you would insulate and render a timber frame house!

EWI and render for a timber frame property

When externally insulating a timber frame property, the EWI system that you want to choose ideally consists of the most breathable materials. For example, the Wood Fibre insulation with our Silicone Render system.

Wood Fibre is a great option for timber frame properties because it is made from waste timber shavings. It is highly breathable and vapour permeable, so water vapour can escape through the material (which is what you want with timber frames to avoid excessive build-up of moisture). Timber is slow burning and Wood Fibre insulation actually chars rather than fully burning away, which smothers the flames and thus slows down the spread of fire.  

We also recommend that during installation you use the DuPont™ Tyvek® FireCurb® Housewrap which will add an extra layer of fire protection and vapour permeability!

Your choice of render on timber frame properties is especially important as well. You maybe wouldn’t want to go for acrylic render, for example, because this is the least breathable. Technology has greatly improved the breathability of renders. We know that coloured renders are extremely popular these days but breathability is something that cannot be sacrificed when it comes to a timber frame property, so we recommend the use of Silicone render. This is a high tech, thin-coat render with vapour permeability and breathability. Silicone render is also perfect for timber frame properties as it will resist organic growth such as algae and mould – further protecting your timber frames!

We recommend that with timber frame properties, you use our EWI-225 Premium Adhesive because again it is breathable, high strength, water-resistant and has high elasticity.  

How is external wall insulation installed onto a timber frame property?

So how is this all applied to the timber frame? Well, ideally with a Wood Fibre EWI system: the DuPont™ Tyvek® FireCurb® Housewrap will be stapled onto the OSB board, then Wood Fibre will be laid over the top using stainless steel wood screws to secure it. After this, the Premium Adhesive is used as a basecoat on top of the Wood Fibre, and then finally primed and finished with a Silicone render. 

Looking to compare all of the insulation options for your property? Our complete guide to our range of insulation materials is one click away.

Will EWI on a timber frame property take away from its appearance?

Many people think that if they install EWI onto their property then it will take away from the unique characteristics of the property. In fact, this just simply isn’t the case, because unique elements of your property can be recreated using materials which mimic the previous look of the property.

For example, on timber frame properties you may have exposed beams. This can be recreated using our wood panels which are made using a wood effect render, created with a silicone mold and then painted the equivalent colour. Brick patterns can also be recreated using our brick slips which come in a variety of different shades. You can also recreate pebbledash using the EWI-235 Dash Receiver (although not many people are that keen on it – check out our blog on how to replace pebbledash with coloured render!).

If you are a timber frame homeowner and EWI is of interest to you, then do get in touch with us here at EWI Store. We can put you in touch with an installer local to you and we can give you an estimated quote for materials. We are also always happy to give technical advice!

Applying render to a range of substrates…

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pebbledash coloured render

Replacing Pebbledash with Coloured Render?

What is Pebbledash?

Pebbledash is perceived by many as an outdated look for a property. This is because it was frequently used during the post-WW1 housing crisis as a means of covering up quickly-built, slap-dash properties. If you live in the UK, you are most likely to have come across a pebbledash building, and while it’s a durable building method, it’s definitely an acquired taste.

The pebbledash effect is created by applying a layer of mortar (usually sand and cement) to the external wall, and literally throwing pebbles at it to allow them to stick. Pebbledash houses are still dotted all over towns and cities in the UK and can often have a somewhat dilapidated look. As well as this, over time the pebbles can drop, which leaves the mortar exposed to the weather and therefore vulnerable to absorbing water and creating problems with damp. Due to its unpopularity, pebbledash can also reduce the value of a property purely for its lack of aesthetic appeal. This is why coloured render is vastly more popular because it’s nice to look at. Our coloured renders are available in thousands of different colours and can be ordered online or by phone!

We’re not hating on pebbledash (much), but many people want to know how to remove it in order to replace it with a coloured render. For those who have recently moved into a new home, or who are looking to update the look of their property, re-rendering is a popular consideration. However, there is a definite gap in the public knowledge over whether you can apply the render on top of pebbledash, and this is something that we are frequently asked here at EWI Store. So, we thought we would tackle the question for all the pebbledash homeowners out there.

The short answer is that unfortunately, you cannot replace pebbledash with coloured render by applying coloured render directly on top of the pebbledash. However, not all hope is lost, because there are a few ways around this that you may want to consider, which we will elaborate on in this blog post…

Ways to replace pebbledash with coloured render

So, as you may have realised, pebbledash is incredibly difficult to get rid of. You basically have three options when considering how to remove pebbledash…

Option one: removing the pebbledash

The first option is to attempt to hack the pebbledash off, at risk of the brickwork underneath and with no guarantee that you will be able to achieve a smooth finish. If you do decide to go for this option be really careful about who you hire to do this and make sure they are experienced in removing pebbledash. If your pebbledash is forcibly removed by a builder, this can really damage the underlying substrate and can invalidate your house insurance. Even after all of this, you still wouldn’t be free to apply coloured render directly over the wall. Building regulations stipulate that if you strip it right back to the original brick then you’ll need to insulate before rendering with a coloured render.

Option two: One Coat Dash Cover (OCDC) to cover up pebbledash

The second method is to use the OCDC to completely smooth over and cover up the pebbledash to achieve a clean slate. This product is specifically designed to be applied on top of Pebbledash, and it can then be painted or rendered to achieve a modern, updated appearance. The good thing about the One Coat Dash Cover is that it is breathable, so it will help any trapped moisture within the underlying pebbledash to escape.  It can also be applied up to 20mm in one pass (up to a maximum of 50mm), so it’s gruaranteed to smooth over the pebbledash nicely!

Option three: insulate then render over pebbledash

A beneficial way of ridding yourself of the pebbledash look is by installing 20mm (or thicker, but the thicker you go the more expensive) external wall insulation boards over the top of your pebbledash. This is actually a great option because the EWI will give you added insulation which can save you money on bills in the long run.

By installing EWI boards, you will also save time and money because hacking off the pebbledash won’t be necessary. This is because you can simply secure insulation boards over the top of the pebbledash using adhesive and mechanical fixings. Once you have done this, you can apply the render of your choice over the top of the insulation boards and achieve a far more pleasing outcome.

Which coloured render can I use to replace my pebbledash?

There are so many options out there for replacing your pebbledash with coloured render that it can be quite overwhelming. We wanted to give you a clear idea of what each coloured render can offer you so that you can make the right choice to suit the needs of your property and your own personal tastes.

Thin Coat Coloured Renders to Replace Pebbledash:

Thin coat render is a great option to go for when removing your pebbledash and replacing it with a coloured render. Because they are thin-coat, they offer a level of flexibility that ensures that your coloured render finish stays crack-proof for years to come. Thin coat coloured renders are also highly breathable, so they will help to prevent problems with damp and mould on your walls.

They also come in different grain sizes, which determines the textural finish that the coloured render will offer you – the bigger the grain size the more textured the finish that you’ll achieve. If you have simply removed your pebbledash, then you may want to go for a larger grain size because this makes any imperfections in the basecoat less noticeable. Read our blog ‘coloured render cost per m2’ for an idea of pricing!

There are three options that you can choose for thin coat coloured renders:

  • Silicone render/Silicone Silicate render: Silicone Coloured Render is a premium, modern technology coloured render – which is available in hundreds of different colours. Silicone is a very popular choice because it offers hydrophobic properties, which means that it repels water, dirt and organic growth – so it probably requires about the same maintenance as pebbledash (very little). Silicone render is also super easy to apply because it comes ready to use, so you just apply it straight out the box. (Read more about Silicone Render here).


  • Acrylic render: Acrylic Coloured render is very similar to silicone, except for it doesn’t provide the same hydrophobic properties. It’s a solid middle-ground thin coat render because it still provides the same flexibility, but it’s also great at holding onto colour pigment. This is a fantastic choice if you are looking to replace pebbledash with a coloured render. (Read more about Acrylic Render here).


  • Mineral render: Mineral Coloured render is a dry-mix, thin coat render. This is a very popular choice if you live in a cold or rainy climate (as many pebbledash homeowners do – Scotland, coastal homes!) because mineral render is extremely fast drying (you can’t apply other renders in cold/rainy temperatures because they take longer to dry). The only thing about this render is that you need to paint it afterwards with silicone paint to seal it in. This is because if it’s left exposed to the elements it can develop lime bloom due to the presence of Portland cement. (read more about Mineral Render here)

Thick Coat Coloured Renders to replace pebbledash:

Thick coat renders are far more traditional but, as the name suggests, they do lack flexibility and breathability because they are applied in a much thicker layer. Once you’ve removed your pebbledash you can use our Monocouche Scratch Render. Note: thick coat renders aren’t suitable for application on top of insulation boards.

  • Monocouche scratch render: Monocouche scratch render is a thick coat, through-coloured render. It is more traditional but does require extra work to install it. This is because the Monocouche needs to be applied in two passes for extra strength and cannot be applied in wet or humid conditions. Monocouche render then needs fibreglass mesh embedded within it to provide extra strength and flexibility (which means it will resist cracking), and then once it’s dried it needs scratching back to achieve the desired texture. Read our blog ‘monocouche scratch render cost per m2′ for an idea of pricing!

To conclude…

If you are a pebbledash homeowner, looking to re-render or potentially even install external solid wall insulation, then we have everything you will need. Check out our materials calculator or get in touch with us directly and we can point you in the direction of one of our fantastic approved installers!

Are you a fan of Pebbledash? Leave a comment below…

We want to strike up a bit of a debate: pebbledash or no pebbledash? Leave a comment below with your opinion, is pebbledash outdated and ugly, or is it a relic from our past that we should preserve for traditional purposes? For those in favour of the pebble-dashed look, we might have something just for you. Check out our blog ‘Pebbledashing: Dash Receiver or Cement Mix?’

We upload a new blog post every Tuesday so stay tuned for more external wall insulation installation advice, tips for homeowners and product information!

acrylic render

What is Acrylic Render?

About Acrylic render

What is acrylic render? We often get asked this, because there seems to be a fair amount of confusion as to what the difference is between acrylic and silicone renders or acrylic and Monocouche Scratch Render. So, we’re going to break it down into what acrylic render is, what its properties are and how it compares to the other renders that we offer.

Acrylic render is a wet, thin-coat render which comes pre-mixed (ready to use) in a wide variety of colours, used as a decorative finish to an EWI system. Our EWI-010 Acrylic Render comes in four different grain sizes: 1.0mm, 1.5mm, 2.0mm and 3.0mm. What this means is that when you look at the wall from a distance, the larger the grain size the more apparent the texture will be, it’s all down to personal preference but essentially if you want a smoother surface you’d go for a 1.0mm grain size.

Acrylic render is a popular choice because it’s long-lasting, aesthetically pleasing and forms a strong protective barrier over your EWI system or simply as part of a render-only system.

Why is Acrylic a popular render?

If you wish to paint your house a bright colour and you are looking for a coloured render that can be mixed into any shade, then through-coloured acrylic render is great because much like acrylic paint it bonds to colour pigment well, so the intensity of the colour will last much longer than other coloured renders. This means that you won’t need to re-paint it every 10 years or so, which can be consuming on your time and money, and considering that our acrylic render is one of our cheapest, it’s a pretty cost-efficient way to render your home.

Acrylic render is also a great choice in terms of being crack resistant, so it will ensure longevity in this respect. Our acrylic render is also the best value in comparison to other coloured renders, because it is long-lasting and only needs to be applied in one coat, so you will save money on labour costs.

Acrylic render and Silicone render

However, there are some minor downsides to the acrylic render when you compare it to the silicone render. Acrylic takes slightly longer to dry, so cannot be installed in wet conditions – but this is common for renders anyway. It’s also a little bit less resistant to extreme weather conditions and due to the fact that it doesn’t contain silicone it doesn’t have the same hydrophobic properties as silicone render.

Silicone render also has self-cleaning properties, which means it is less prone to organic growth. So in terms of comparing it to acrylic render, you’ll probably need to clean acrylic more regularly than Silicone.  Acrylic render does offer breathability, however it isn’t quite at the level that silicone render can provide.

Acrylic render and Monocouche Scratch render

Whilst silicone render could be considered the slightly higher performing sibling to acrylic, monocouche is very different. The monocouche render is a thick-coat, traditional-style render. Instead of coming readily prepared, it needs mixing with water in a mechanical mixer and then it is applied to the wall in two layers with a trowel. Once both the layers have set slightly, it is scratched back to create the desired texture.

The good thing about the monocouche render is that once you have gone through the application process, it is pretty much maintenance free and, as with all of our renders, is very long lasting.

So, there you have it, acrylic render is a great thin-coat render that can offer you the good performance and longevity that you require! If you are interested in any of our renders and you are still feeling unsure about which direction to go in, then do give us a call as our sales team are all experts and would be happy to help.

Looking for a free quotation? Fill out our quick and easy calculator!


Applying Render to Cement Board

Applying Render to Cement Board

Cement boards (sometimes also referred to as render carrier boards or even weather carrying boards) provide a solid, durable surface that can withstand the extreme weathering effects of wind, rain and snow. The most common two types of cement board available on the market for renders are Aquapanels, Renderflex and Siniat boards. The boards tend to be made up of cement, magnesium oxide coating, an aggregate and fiberglass mesh. This combination provides an impact resistant barrier, but the real beauty of these cement boards is that they don’t rot or swell when they come in to contact with water, so they survive a long time even when located on the exterior of the property.

Cement boards can be finished in numerous different ways, but one of the most effective ways to finish them is to apply render to them. Applying render to cement boards provides a fantastic looking finish, but also offers a further level of protection to the boards. So how do you go about it?

Applying Render to Cement Board

The first thing that you need to do is to prime the cement board. We recommend priming the cement board with EWI-310 Universal Primer, because the presence of silicate in the primer allows the basecoat layer to key into it – ensuring a really strong adhesion between the cement board and basecoat layer. Our complete guide to EWI Primers gives full information about our whole range so have a read about that for more information!

EWI-310 Universal Primer comes in 20kg buckets and each bucket can cover between 60 and 80m2 depending on the absorption from the cement board. The primer is applied to the cement board by a brush or roller and is red in colour allowing you to see where on the wall it has been applied. We recommend allowing this to dry completely before applying the next layer.

Applying the Basecoat to the Cement Board

Applying the basecoat to the cement board is relatively easy – we recommend using either EWI-220 or EWI-225. The EWI-225 is slightly stronger than the EWI-220 so it depends on how solid you need this façade to be. Both the EWI-220 Basecoat Adhesive and the EWI-225 Premium adhesive come as a dry mix and therefore need to be mixed with water prior to application. Once the adhesive has been mixed with water and the grey putty has formed, it needs to be applied to the cement board with a notched trowel. We recommend using a 10mm notched trowel, this is the best size of trowel to apply a 6mm layer of adhesive to the cement board.

Once the adhesive has been applied it is time to embed the fibreglass mesh within it; it is this mesh that gives our render systems such flexibility. EWI-640 Reinforcement mesh comes in 50m2 rolls (1mm wide), and this needs to be applied in vertical strips within the adhesive. The strips of mesh need to overlap one another by 10cm at edges and this is needs to be sunk within the layer of adhesive – this can be done by using the flat edge of the notched trowel and drawing this up from the bottom of the wall – this will pull the adhesive through the holes in the mesh.

Remember the render topcoat is incredibly thin so therefore the basecoat layer needs to be completely smooth before applying the render. If you have embedded the mesh and the finish isn’t completely smooth the easiest thing to do is produce a very wet adhesive mix and apply this to the basecoat before the first layer of adhesive goes off. This should allow you to create this smooth layer ready for application of the render.

Once the basecoat layer has completely gone off, you are ready to prime the wall ready for the application of the render top coat. The primer depends on the render used, but provided you match the primer with the render, then the principle is exactly the same. Take for example EWI-333, our Silicone Silicate Primer which comes in either 7kg or 21kg buckets. This primer is applied to the basecoat layer using a paintbrush or roller, with the 7kg bucket covering approximately 20m2 and the 21kg bucket cover 70m2 of wall.

Applying Render to the Cement Board

It is time to apply the render to produce the finished façade! The vast majority of EWI-Pro renders are thin coat renders, with the exception of the Monocouche Scratch render, therefore the thickness of the layer is determined by the size of the granulate in the render. For example EWI-040 Silicone Silicate render comes in 4 thicknesses, 1mm, 1.5mm 2mm and 3mm. The layer of the render should therefore be either 1mm, 1.5mm, 2mm or 3mm depending on the render used – it should be no thicker!

This is really important to remember, and will ensure the finish is good. We have heard of several reports of people applying the render too thick and not being able to achieve the required finish. With that in mind, apply the render to the cement board with a trowel and then pull off all the excess with the trowel. Once you have taken off any excess, leave the render for 5 mins and then using a plastic float, work the render in a circular motion to give the final finish.

Applying Insulated Render to Cement Boards

Using insulation on sheathing boards, is referring to the installation of EPS, Mineral Wool or Wood Fibre onto suitable cement boards or weather carrying boards. These systems are normally found installed on non-traditional substrates like metal frame or wooden frame buildings. The cement board is installed onto the non-traditional structure using the appropriate fixing method. Once the boards are secured the insulation system can be applied. Insulation is fixed mechanically to the sheathing board nice and secure – keeping to the manufacturer’s fixing pattern.

Once the insulation is secured, the beading can be applied onto the insulation. This includes the corner beads, stop beads, reveal beads and any drip beads. Once the insulation is secured by the adhesive mixture, you are ready to install the reinforcement layer. As per the render only system, the reinforcement layer can be applied using either the EWI-220 Basecoat or the EWI-225 Premium Adhesive.

Once the walls have been primed they can be rendered using the coloured renders. The EWI-040 Silicone Silicate and the EWI-075 Silicone Renders are our most popular coloured through renders and would work very well on a nice and level basecoat. The renders can be coloured and pre-mixed to suit your requirements.

There you have it – how to apply render and insulation to cement boards! If thin coat render systems are of interest to you, then you can check out our blog post ‘coloured render cost per m2′ for a really accurate idea of how much the materials for a coloured render system typically cost.

A recap of the materials required to render cement board:


Looking to re-render a property?

If you are looking to re-render a wall then EWI Store can provide all the materials. The process is relatively simple, but the finish should be long lasting and certainly improve the look of the existing façade.

Do you need to remove the existing render?

To re-render a wall, the first thing you must do is check the quality of the existing render. If in any doubt about its strength, then it must be removed before applying the new render coat. This is a painful but necessary process, since the new render needs to be installed on a stable substrate. If it is not removed prior to installing the new render, then sometime down the line cracks may appear or worse, your new coat of render will fall away from the wall.

If the existing render is okay in patches, then you have a choice – you can either remove the existing render so you are left with the bare wall or you can using a wall levelling compound to where the old render has come away from the wall. The wall levelling compound we provide can fill gaps of up to 50mm, so this can be used to build up to the thickness of the good render to give you a stable surface on which to apply the new render.

Following either of the methods above will give you a suitable surface on which to re-render. Once you have a strong, stable surface, the next thing to do is install the reinforcement layer. Using a notched trowel, you need to add a 6mm layer of EWI-220 Adhesive to the wall. Each 25kg bag of EWI-220 (once mixed with water to form the adhesive putty) should cover approximately 5m2 when 6mm thick is applied.

Reinforcing the reinforcement layer (or basecoat!)

Once applied, you then need to embed the fibreglass reinforcement mesh (EWI-640). This comes in rolls – 50m long by 1m wide. We recommend doing this in vertical stripes, and each stripe needs to overlap the last by 100mm. The easiest way to embed the mesh is to first cut a strip the length of the wall top to bottom then, starting at the top, gently push the mesh into the adhesive, so it stays in place. Once the mesh has been gently pushed in by hand, turn the notched trowel around so you are using the flat edge and drive this down from the top – this will draw adhesive through the holes in the mesh and embed it within the adhesive layer.

The aim is to get the mesh embedded within the middle of the adhesive layer – the mesh is really important as it provides strength and flexibility to the render system, ensuring it won’t crack.

Once you have embedded the mesh, stand back and admire your handiwork. If it is not completely flat, we recommend using a wet adhesive mix to smooth out the surface. Do this before the underlying adhesive has fully gone off to ensure it adheres properly. It is very important the reinforcement layer is flat prior to applying the render because the render layer is very flat.

Once you are happy with the reinforcement layer it is time to prepare the wall for the final render topcoat. The key to a nice finish when rendering is applying the render very thinly – if the render is 1.5mm, then the render layer should be 1.5mm in total. Likewise if the render finish is 1mm (size of aggregate in the render) then the render layer should be just 1mm in total.

The first thing to do prior to applying the render is to prime the wall first. If you are using a colour render finish, then normally the primer will need to be tinted as well – check that this is the case before starting the render work.

One 21kg bucket of primer will cover approximately 70m2 of wall, while the small 7kg bucket will do just over 20m2. The primer can be applied with either a brush or a roller and this needs to go off before applying the final top coat of render. It is important to match the primer type (e.g. acrylic or silicone) to the final render you are using.

Picking the render

We offer several different types of render including water based renders (acrylic, silicone silicate and silicone) as well as mineral render which is concrete-based.

The water based renders come ready mixed and tinted as per the colour selection. The mineral render is a grey colour and needs to be painted once it has been applied to the wall. We have discussed the major differences between the renders previously and you can read more about that by clicking on the link below

>>> What is the difference between the renders? <<<

Applying the render

The render is applied using a trowel as usual; ensure you take off any excess though, as the render layer is incredibly thin. Once the render is on the wall, the final finish is achieved using a plastic float.

Screen Shot 2016-06-27 at 10.36.03

What does render look like up close?

We offer several different types of render (including mineral, acrylic and Silicone Silicate) and they all look pretty similiar up close. however, each render is available in different grain sizes – 1mm, 1.5mm, 2mm and even 3mm (Silicone Silicate render). We often get asked what the render looks like, so we got the camera out and took some photos of the different grain sizes.

The pictures were taken 30cm away from the render, so obviously the further you get away from the wall the smoother the top-coat looks, but hopefully this gives you some idea of what you will achieve. It is also worth mentioning that all of the renders we sell at EWI Store are available in hundreds of different colours. You can pick you favourite colour by clicking on the link below:

>>> See our render colour charts <<<

Without further ado – please take a look at the different top-coat finishes:

Silicone Silicate – 1.0mm

1mm Silcone Silicate Render up close

Silicone Silicate – 1.5mm

1.5mm Silcone Silicate Render up close

Silicone Silicate – 2.0mm

2mm Silcone Silicate Render up close