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An external wall insulation system is fitted to a property in layers by an accredited installer. These layers include insulation boarding, render and a decorative waterproof top coat.
Approximate time for installation: 7 – 10 days for an average semi-detached house.
Factors to consider: The weather can affect EWI installation. Cold weather means the system takes a lot longer to dry and any rain could wash off the final primer coating. Installers will check the weather forecast on the days when different coatings are to be applied and may not undertake work if rain is predicted.
If rain does occur during installation, your installer may need to re-apply the render for the system to seal effectively. YES Energy Solutions’ installers are highly trained EWI professionals. We will only sign off an installation once the topcoat has set properly and that ours customers are happy with the work undertaken.
Level of disruption: There is minimal disruption during an EWI installation since the majority of the work takes place on the outside of the house. The only potential disruptions are:
How long does the topcoat take to dry?
It depends on how warm it is. In 20°C heat, the system will be dry 4 hours after the application of the final coat, in 6°C it could take 24 hours.
In order to give you a realistic sense of exactly what will happen during installation, we spoke to one of YES Energy Solutions experienced EWI installers - Stuart Player and asked him to take us through the process step-by-step:
The survey will also highlight what remedial work needs to take place. Fixtures and fittings that are currently on the external walls of the house will need removing or extending for installation. This can include: gas flue pipes, alarm systems, outdoor lights, satellite dishes and down pipes. The survey will assess what preparations need to be made before any work can take place. Following the survey, a quotation will be produced for you to consider and sign off.
Your installer can arrange all of this work for you so you don’t need to worry. If you would prefer, you can arrange for the work to be carried out by different tradespeople yourself.
The structure of the polymer-modified coating is comparable to a lot of little threads or shards, which means it is very flexible and extremely strong. The whole meshcoat protects and strengthens the insulation boards.
Silicon is considered a smooth finish. Other finishes are available such as dry dash, which is effectively small stones that will produce a more textured finished, and brick slip effect, which is a render that looks like a brick wall.
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