There are many benefits of choosing an EWI system:
• Large range of renders and textures.
• Reduces heating bills by up to 40%
• Reduces carbon footprint by cutting Co2 emissions
• Massive choice of colours
• No disruption to building interior
• Does not reduce internal floor area
• Can eliminate thermal bridging
• Renews aging exterior finishes
• Provides major aesthetic improvements to a building
• Very flexible – hides cracks in old plaster
• Ensures consistent U-values
• Improves the air-tightness of a building
Some points on EWI
The past twenty years has seen the rendering industry completely change. Sand and cement rendering has largely become a thing of the past as new technologies and processes have been developed and embraced. Nearly all renders now are ‘through coloured’, meaning there is no need to paint them. They are also enhanced with minerals, silicones and other ingredients to give them protection against movement, cracking and the elements. And it’s not only the products that have changed.
The method of application has also moved with the times.
Nearly all site rendering is applied by pump and has been for the last 10 years or so. This allows for perfect mixing ratios and faster application.
Over the past few years, forward thinking companies that service the domestic market have also invested in these machines. We felt it was important to be able to deliver better quality renders than our competitors.
One of the fasting growing markets in the rendering industry is EWI (External Wall Insulation).
This involves attaching insulated blocks to the external walls of your property and then finishing with either a Monocouche (French for "1 layer"), through coloured render, or a thin coat acrylic render system.
It means that instead of having to insulate from the inside, a process that causes major disruption and also means you lose a lot of room space, we can work from the outside.
There’s no need to move out while the work is done (as is necessary when it’s done internally) and you get a fantastic choice of finishes. Also, there are no internal decorating costs to allow for, as the inside of the property is left completely untouched.
Add in the fact you’re saving up to 45% of lost heating costs and you can see why this market is booming in the UK right now. These modern rendering techniques have become a major part of what we do nowadays and we love doing them! There’s nothing better than transforming a property and it’s one of the most rewarding services we offer.
IF YOU LIVE IN AN OLDER HOUSE, YOU HAVE PROBABLY NOTICED THAT YOU SPEND A LOT OF MONEY KEEPING IT WARM IN THE WINTER.
You may also notice that even when the house is warm inside, some of the walls feel cold to the touch or have condensation. That’s because most pre-1920’s homes (which includes most terraced houses) have solid brick walls which are poor at keeping in the heat. The good news is this – solid walls can be treated with external wall insulation.
What is external wall insulation?
External wall insulation is also known as “solid wall insulation”, and sometimes just shortened to EWI. It is used to insulate houses that do not have cavity walls. These are usually older homes (pre-1920s), including many traditional terraced houses.
External wall insulation is attached to the outside walls of a house, covered in several protective layers, and finished off with either render or another decorative finish.
Do you need external wall insulation?
Cavity wall insulation is easier and cheaper to install than external wall insulation.
EWI is designed only for properties that either a) do not have cavity walls, or b) are ‘hard to treat’ e.g. the cavities are too small to insulate.
How does it work?
Similar to cavity wall insulation, EWI creates a barrier that stops heat escaping through your walls. Unlike loft and cavity insulation however, EWI uses a rigid insulation material – expanded polystyrene slabs. Expanded polystyrene contains thousands of trapped air pockets, which makes it an extremely good insulator. It is also easy to cut to into shape, meaning it can fit neatly around windows, door frames and other architectural features.
The slabs are held in place with fixing anchors which are drilled into the existing walls and then covered with a layer of reinforcing mortar. This is covered with a glass fibre mesh, which when dry gives the insulation system its structural strength.
Finally, a primer layer and a decorative render go on, making the house look as good as new (or dare we say it, better than new!) The insulation adds about 9cm to the thickness of your walls, so the shape of your house will not look drastically different.
The process does take several days, depending on the weather. Luckily for you the work all takes place outside, so other than having to walk under the scaffolding when you go in and out of the house there is very little disruption.