Are you annoyed with the high electricity bills? Are you unable to sleep because of the outside noises? The main reason behind this is that your walls are not adequately insulated. Yes, whenever the exterior walls of any home are not well insulated, residents feel these kinds of problems. 

So what is the solution? The only solution is the External Wall Insulation System (EWIS). This will increase the thermal performance and it will also provide you many benefits such as noise reduction, water resistivity, and weatherproofing. People who don’t know about the exterior wall insulation process, don’t worry. Today we are going to tell you all about this insulation process. From different types of insulation to how to install it, we have covered everything.  So keep on reading. 

Tip: If you still aren’t aware of the government backed insulation grants that you won’t have to pay if you qualify then contact the nearest energy grant specialist like Warma UK to know more about free insulation grants.

What is External Wall Insulation?

external wall insulation


An external wall insulation system (or EWIS) is a method that is used to upgrade the thermal performance and external appearance of the buildings. EWIS can be a protective, decorative, and thermally insulated cladding that is used with mineral wool, polyurethane foam, or plaster. After the external insulation, the properties will be transformed into energy-efficient, warm, and attractive structures.

Types of External Insulation       

installing exterior part


Depending on the method of transferring heat, the insulation has two types:

1. Preventing Insulation: 

This type of insulation is used to prevent heat transfer from the walls due to their low thermal conductivity. The coefficient of thermal conductivity should be small because the smaller coefficient is the best. That’s why it is the most used type of insulation in the construction. 

Preventing insulation has the following types:

  • Insulation on the inorganic basis
  • Insulation on the organic basis
  • Insulation of mixed type

2. Reflective Insulation

This is also known as foil insulation, and it is used to protect the building from heat losses. They occur due to thermal radiation by the high reflectivity of the foil, which is part of the insulation.

Benefits of Exterior Wall Insulation 

external wall insulation


Now you’re thinking that why you should go for external wall insulation, here are some benefits which you’ll get: 

  • EWI significantly improves the thermal inertia of the walls and also limits heat loss. So ultimately, it reduces the heating costs and reduces CO2 pollution.
  • The continuous heat loss through the walls causes damp, which later lead to the paint & plaster degrading. Damp can also cause respiratory problems. Damp walls will easily prone to mites and mold. These things will never happen with the walls that are externally insulated. 
  • Surprisingly, EWIS can also help in reducing noise pollution. Unwanted sounds can have harmful impacts on our mental health. External wall insulation will cut down all the disturbances and make your home more comfortable and quiet. 
  • You can decorate or paint your EWI walls with various shades and textures. Apart from this, EWI systems are compatible with multiple decorative finishes such as renders, brick effect, silicon paints, and dry dash. 
  • Whether a building is new or old, the EWIS makes it ultra-modern and new. Potential future buyers of the home will mostly be interested not only in the appearance of the house but also in the thermal performance. So, a well maintained and insulated home is a more valuable one. 

How is External Wall Insulation Installed?

external wall insulation


Before installing the external insulation, the first thing that should be checked is the render. If the building has the existing render, then it must be checked whether it is strong enough to hold the insulation or not. If not, then all the existing renders will need to be removed and you have to place new ones. Another crucial step is to remove all the pipelines from the building’s external facade. Don’t worry; they will be installed after the insulation process will get completed.

The insulation process of any exterior wall is done by using polymer-adhesives, which should be applied to the insulation. After this, you have to provide reinforcing mesh on the surface and lastly a topcoat. This insulation method can only be effective for the southern climates as it is inexpensive, quick, and nature friendly. 

EWI can be done by various methods, but it mostly depends on the locations and their type. Here are three installation methods: 

  • Three layers of hollow brickwork technology
  • Heavy facade plastering
  • ventilated facade

Let’s start with the external wall insulation process. Basically, the EWI systems are built up in several layers:

  • Insulation layer (polystyrene, resole foam, mineral wool)
  • Glass fiber matting
  • Undercoat render and primer
  • Topcoat (paint, render, etc.)

Although the process is relatively complex, here are the basic steps: 

  1. Firstly, the insulating panels are fixed to the exterior wall using adhesive mortar.
  2. After this, plastic capped fixings are fixed through the panels and also around them to tie the panels tightly and securely to the wall. 
  3. Then mortar is applied all over the surface of the insulating panels and also on the fixings. 
  4. An insulating mesh is also placed on it so that it can hold the panels in the right position. 
  5. After that, when it is thoroughly dried, mortar is sanded and painted with a primer.
  6. The last step is to paint the walls in your desired texture or paint.  

External Wall Insulation Costs

installing exterior part


Somehow the pricing of the external insulation will be higher than the internal wall insulations. For example, a three-bedroom home is likely to cost between $6000 – 11000. But it totally depends on the area of the house and the walls you want to do insulation. 

Their cost includes removing/replacing all of the pipes and cables, which is why this process might be a little expensive. For more home and office related information such as Budget-friendly home improvement ideas, then click on the link to read the blog.

The Bottom Line

external wall insulation


So if you want a well-insulated and energy-efficient home, then definitely you should go for an External wall insulation system (EWIS). After the insulation, your walls will surely reduce the noise and heat and as well as the bills. It significantly improves the weatherproofing of the walls, and your house will look stunning for many years. 

They might be a little expensive for some people, so it is always good to check the local price of the external insulation in your area. It is always better to invest in the right things, right? 

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