Tag Archives: Home Renovation

Applying Render to OSB

How one should go about applying render to OSB is a question that we get asked on a near-daily basis. The simple answer is that applying render directly onto the OSB is not an ideal situation – it’s important to remember that at the end of the day, OSB is wood.

Nevertheless, there is a solution for rendering OSB, and we’re going to talk you through the best way you can do this!

Rendering OSB: Render Carrier Board

When rendering any substrate, especially when rendering OSB, consideration needs to be taken as to the suitability of the substrate for the materials that you are using. OSB is not completely waterproof and will inevitably absorb water from the basecoat, which can cause the wood to warp, eventually hindering structural integrity.

To avoid this, the best solution is to use a render carrier board. However, the render carrier board needs to be attached to battens, rather than to the OSB directly. This is because the two separate fabrics (the RCB board and the OSB) need ventilation between them to allow moisture to escape, and to avoid a situation where water builds up between the two materials. An air gap between the two is therefore necessary for the reduction of condensation.

The best course of action is to:

  • First, staple a breather membrane onto the OSB substrate – this will help prevent the build-up of condensation on the surface of the wood.
  • Next, install timber battens on top of the OSB (the positioning of the battens will depend upon the size of the render carrier board you are using).
  • Once these are in place, you can secure the render carrier boards onto the battens with wood screws.

The spacing of the boards will depend on the type of render carrier board you are using, but generally, you would leave 4-5mm between each board.

After the boards are in place, the gaps between them need to be covered over by a render carrier board tape. We recommend a tape that is breathable with a self-adhesive membrane, so it will prevent water vapour from gathering in the gaps between boards.

Basecoating the Render Carrier Boards

Render carrier boards don’t require priming because they are specially designed for being rendered, so you can go straight into applying the basecoat with no problems.

Although it is possible to use the 220 Basecoat Adhesive, we recommend using the 225 Premium Basecoat as a basecoat for extra strength and breathability. At this stage, the necessary beading required for the structure is sunk into the basecoat along with fibreglass mesh – remember to overlap each strip of fibreglass mesh by about 10-15cm.

Allow the basecoat to set for a period of 24-48 hours, before priming the basecoat with a Render Primer. The type of primer you use will depend upon the type of render, for example, if you were to render using Silicone Render (we recommend this one for buildings that require a high level of breathability), you would need to use our SiSi Render Primer. This can be painted on and then left to dry for 12 hours.

Rendering the Basecoat Layer

After all that essential preparation of the OSB and RCB boards, you are finally ready to render. Using our ready-to-use Silicone Render, apply it onto the substrate using a trowel. The render should go on at a thickness that matches the chosen grain size – for example, if you’ve chosen a 1.5mm grain size finish, then you should apply the render at 1.5mm thick.

Once distributed across the surface, rub up the surface of the render with a plastic render float to bring out the texture and achieve a consistent finish, then leave to dry for 24-48 hours. 

Struggling to chose a Silicone Render colour from our selection? Order a colour sample here.

 

Want to learn more? Come to one of the EWI Pro training centres!  More information found in the video below.

 

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Why you should have External Wall Insulation on your Cavity Walls

Whether your house should occupy cavity wall insulation (CWI) or external wall insulation (EWI) is an age-old question that still leaves homeowners confused. While it seems obvious that CWI should be installed on cavity walls and EWI on solid walls, there are many benefits to having EWI installed on your cavity walls. Of course, the decision ultimately comes down to what best suits both your budget and your property; however, with CWI’s history of creating issues surrounding damp and mould compared to EWI’s aesthetically pleasing and energy-saving properties, it’s clear why EWI is quickly becoming the favoured choice.

If you’re still torn on which type of insulation would be best for your home, we’ve compiled a little guide on the advantages and disadvantages of both CWI and EWI to aid your decision.

Advantages of Cavity Wall Insulation

If CWI is the only option for you, it does offer some benefits:

  • CWI does not alter the external appearance of your property
  • CWI helps to reduce your energy bills
  • CWI keeps your house warmer in the winter
  • CWI helps to reduce your carbon footprint
  • CWI is very quick and easy to install
  • CWI is cheaper than EWI

Disadvantages of Cavity Wall Insulation

If you are considering CWI, it is important to consider these factors:

  • CWI is at risk of being improperly installed by underqualified installers
  • CWI has been known to trap moisture and cause dampness when poorly installed
  • CWI restricts the amount of insulation that can be installed (dependent upon the size of the cavity), making it less effective than EWI
  • CWI is not suitable for all buildings (i.e. solid wall structures)

Advantages of External Wall Insulation

In contrast, EWI offers many benefits:

  • EWI massively improve the façade of a property due to the decorative topcoat
  • EWI has no restriction as to how much insulation can be installed (you can get up to 200mm+)
  • EWI regulates the thermal comfort of your home, thereby reducing energy costs
  • EWI materials such as Rockwool have soundproofing capabilities as an added advantage
  • EWI has minimal risk of dampness and condensation issues
  • EWI does not cause thermal bridging
  • EWI prolongs the lifespan of the building by protecting its exterior walls
  • EWI increases the value of the property in terms of its energy efficiency and external appearance
  • EWI requires very little maintenance
  • EWI is suitable for virtually any property type

Disadvantages of External Wall Insulation

Though not strictly disadvantages, there are some things to consider before installing EWI:

  • EWI is more expensive than CWI due to the number of materials required and the higher level of skill required to install it, but its long-term benefits make it worthwhile
  • EWI requires skill to install to ensure it is safe and won’t cause problems further down the line, so you need to be careful as to who you hire
  • EWI can be difficult to get planning permission for on older properties as it creates a completely new exterior
  • EWI may need the occasional touch up to ensure the render topcoat remains fresh, but this can be easily completed by giving it a little wash and by using our Silicone Paint

The verdict: Why you should choose External Wall Insulation

If you already have CWI installed and it’s not as effective as you would like it to be, you can certainly have EWI installed as well. By doing this, not only will you achieve two layers of insulation but any thermal bridges within the existing CWI will be negated by the EWI. Together, CWI and EWI will achieve maximum aesthetic and thermal performance.

Nonetheless, the downside is that you can’t have one without the other; trying to install EWI onto an empty cavity wall will achieve very little given that the air within the cavity will be heated up before escaping. Therefore, if you don’t have CWI insulation already, be sure to have that installed first, then consider EWI at a later date.

To conclude, EWI offers an array of benefits to an insulated cavity wall property; it greatly increases the thermal comfort, massively enhances the façade and even prolongs the lifespan of the building, to name a few. If you’re looking for more advice on having EWI installed onto your home, do not hesitate to reach out to our technical team who are available to help every step of the way!

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Monocouche Render vs. Silicone Renders

As you might have noticed, we offer a variety of advanced render systems here at EWI Store, the most popular being monocouche and silicone. Both monocouche and silicone render provide a decorative finish on the external walls of a property whilst also improving its thermal comfort. The result of the external appearance, however, greatly depends on the type of render chosen. In this blog, we discuss the main differences between monocouche and silicone render so that, if you are torn as to which one to choose for your renovation, we can assist in the decision-making process!

Monocouche Render

There are a wide variety of monocouche renders available on the market; here at EWI Store, we stock EWI Pro, K-Rend and Enewall. The key characteristic of monocouche render is that it is a through-coloured, thick-coat render. Monocouche render is very often compared to sand and cement render because it contains cement however, it is very different in terms of texture and characteristics.

Monocouche render tends to offer a chalkier finish than other renders. To provide the finished facade, the render is usually scraped to create a pitted effect. Available in a range of colours (natural and bright), it’s a very popular choice for homeowners who are looking to create a chalky, flat finish.

Silicone Render

Silicone render is a highly flexible, breathable and durable render that comes ready to use in 25kg buckets. Unlike monocouche render, silicone render is a thin-coat render, meaning it is applied very thinly on top of a reinforced basecoat. Although readily available in a standard white, silicone render can be tinted to absolutely any shade. Here at EWI Store, we have specialist tinting equipment that enables us to match to any RAL, NCS or Pantone colour, meaning we can cater to absolutely any taste. Silicone render can be used as a standalone system straight onto brick or applied onto external wall insulation boards to provide a decorative finish.

One of the main advantages of silicone render is that it is crack-resistant. The silicone properties within the render, coupled with the way it is applied, means that it is far less likely to crack than monocouche render.

Now that you know the difference between monocouche and silicone render, you might be wondering how much each cost to install. If so, we’ve got you covered: check out our blogs on monocouche scratch render cost per square metre here and coloured render cost per square metre here to get an idea as to how much you’re looking at.

We offer a variety of advanced silicone-based renders, including Nano Drex Silicone Render, Premium Bio Silicone Render, Silicone Render and Silicone Silicate Render. If you’re interested in trying any of these, be sure to give us a call and our lovely Sales Representatives will be happy to help!

If you’re looking for an approved installer to carry out the work for you, fill out the form below and we will be in touch. We upload blog posts every Tuesday and Thursday, so keep up to date with our blog and social channels to find out more!

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FREE COLOUR CHART

Receive a FREE Render Colour Chart (and beanie)!

As a thank you to all our loyal customers and advanced installers, we at EWI Store are offering FREE Render Colour Charts AND EWI Pro Beanies! Our Render Colour Chart is a fantastic resource for customers and installers alike, so you don’t want to miss out on this opportunity. If you’re wondering what a Render Colour Chart is, or equally how to receive your free copy, keep on reading!

What are Render Colour Charts?

At EWI Store, we understand that choosing the right render colour for your property can be a difficult decision; it’s hard to visualise exactly how the colour you want – or think you want – will look on the finished facade. And, when you hear that we offer thousands (yes, thousands) of colour choices, you can feel even more overwhelmed. That’s where our Render Colour Charts come to save the day!

Our ability to tint our render to absolutely any colour, including any RAL, NCS or Pantone shade, means that we cater to absolutely every taste. Our Render Colour Chart is available for our entire thin-coat render range, allowing you to visualise realistic colours and textures before making your final decision.

Our Render Colour Chart is not just a leaflet with small images; it is a durable, compact hardback brochure that provides official swatches of different render colours and grain sizes. Our installers find them to be an extremely handy resource, so you don’t want to miss out on receiving one for FREE!

How can I receive my free Render Colour Chart?

If you are not already registered with us, you will first need to create a trade account with us. Click here to register your account with us. If you are already registered with us, simply make sure you are logged in to your account.

Then, to receive your free Render Colour Chart, simply go to your cart and enter the code colourchart21 in the text box. What’s more, you will also receive a free EWI Pro Beanie AND free postage with your free Render Colour Chart – what a deal!

On behalf of everyone at EWI Store, we want to thank you for your custom and loyalty. We hope you enjoy your free gifts!