Exterior thermal insulation

Complete guide to the exterior insulation of your home

The purpose of building a house is to live there peacefully for a long time. Moreover, the inhabitants of a house can get adequate heat in winter and refreshing in summer due to proper construction. But what if the building does not serve this purpose?

Therefore, in this article, you will learn about the best exterior thermal insulation for your home. Romanian builders began to implement external thermal insulation in the 90s. It is still practiced and recognized as one of the essential steps in repairing an old building.

To do this, more methods and more materials are needed. And they all have both advantages and disadvantages. They must be carefully examined before starting the work process.

You have some time to go through the information and know why you need exterior insulation, necessary material and, most importantly, the procedures for building an exterior insulation house.

T he Best exterior thermal insulation

At least 35% of the heat in your home can be lost due to poorly insulated or uninsulated walls. Of course, this is the hard-earned money that flows through the walls of your home. Upgrading or installing wall insulation is a great way to save money in the long run.

There are 3 main types of wall insulation, depending on the type of wall construction in your home. These are:

  • Pumped cavity
  • Interior wall insulation
  • Exterior wall insulation

Don't worry if you're not sure what kind of walls you have. A member of the building thermal solutions team will analyze them and advise you on which process is most accurate for your home. Because our topic is based on exterior thermal insulation, we will discuss this first.

Why you need exterior thermal insulation

There are 3 reasons why you would need exterior thermal insulation. So, as a landowner, you need to know this very precisely so as not to waste money. Continue reading the points below carefully.

To make repair costs more efficient

If you always have to keep the air conditioner on in the summer and the heaters on in the winter, it indicates that your home is not energy efficient. This is the exact reason if you never manage to get hygrothermal comfort.

The precise definition of hygrothermal comfort is the perfect level of temperature and humidity in your home. Maintaining these perfect levels involves the maximum energy consumption of the house.

According to a report, 25% of consumption is intended for air conditioning, and home heating consumes 57%. So it is clear that for other utilities, such as cooking, lighting and household and electronic appliances, we use only 18% of the total energy consumption.

In addition, it means that maintaining the hygrothermal comfort of the house is very expensive. So, to reduce these costs, you need to increase the energy efficiency of the building by reducing energy consumption without reducing the current level of comfort.

To accurately determine the energy efficiency level of the building, you need an energy audit and expertise, which can provide you with building thermal rehabilitation solutions. The essential tasks of rehabilitating the house are:

  • Exterior wall insulation
  • Installation of double glazing
  • Replacement of distribution pipes

The main reason for the external insulation of the walls is the extension of their thermal inertia. So, walls with high thermal inertia collect heat more slowly and even discharge it more slowly to cool.

In short, your walls will distribute heat in winter, stay relatively cold in summer, and consume less gas and electricity for the exact maximum level of thermal comfort.

Keeping moisture away from the structure of the house

Both the temperature and the humidity level affect the hygrothermal comfort. Much of the humidity in the house is developed from our daily activities, such as cooking, washing dishes, personal hygiene, washing and drying clothes, hard work that makes you sweat, etc.

Humidity can be greatly increased in the house due to the uninsulated walls. Passing the ideal humidity level, which is around 40 and 50%, can cause:

  • bug formation
  • mold and moisture formation
  • bad smells
  • distortion of furniture and flooring

Generally, water from the outside environment, which can form due to rain, fog, snow, etc., is placed in the outer walls and then penetrates the plaster. But the actual exterior insulation includes thermally inert tools and vapor barrier foils. The best part is that it has an anti-compression effect and does not allow moisture to enter the house.

However, waterproofing is often completed by interior insulation and is a vital process during home construction. The specific concentration is given to roofs and basements, because it comes into contact with rainwater more often.

In short, during the construction of the basement, drainage methods are used, waterproofing the walls with a crystal membrane and mass waterproofing of concrete methods. And during the construction of the roof, a bituminous membrane method is implemented.

To make your house soundproof

It is not very pleasant to get sound from outside while resting or working. So, to be completely silent in the house, it is essential to have a soundproofed house. According to the World Health Organization, noise pollution can pose a high health risk, which can lead to sleep disorders, stress, tinnitus, hypertension and hearing loss.

Moreover, if you face daily noise pollution, such as the noise of construction sites, traffic, airplanes, industrial areas and much more, it can be solved by external insulation. Exterior insulation will not let heavy outside sound enter your home.

You can get aluminum exterior shutters to reduce the sound by 10 decibels that eventually come from the outside. Even double glazing plays a vital role in sound insulation.

But if you want the noises inside your home to come out, then interior insulation is a perfect choice. In this case, it is ideal to obtain materials such as polystyrene and mineral wool. An essential thing to know in this case is that it will reduce the space of your room.

Interior insulation VS. Exterior insulation

From the above discussion, it is clear that interior insulation would be an excellent choice in some certain cases than exterior insulation. However, both isolations have pros and cons, which are briefly discussed below:

Exterior insulation


  • Most useful for thermal insulation, because it protects the wall from outside temperature
  • Effective in sound insulation and waterproofing
  • It does not minimize the internal space of the house
  • Different types of consumables can be used


  • More expensive
  • It needs adequate logistical effort in tall buildings

Interior insulation


  • Budget friendly
  • It can give successful results in the case of sound insulation
  • It can be used if the owner believes that the perspective will be changed due to exterior insulation
  • It can be used in various stages of construction to protect the upper rooms


  • Decreases the interior spaces of the room
  • The painting must be completely removed
  • No additional paintings can be made to decorate the wall
  • You need to remove the radiators and replace the pins with larger ones
  • Thin polystyrene should be used because it is designed primarily for interior insulation. But, it is much more expensive

After going through the advantages and disadvantages of both, it can be seen that the exterior insulation is applied more. Moreover, your need will decide what materials and what kind of work you want.

Materials used for exterior insulation

There is no special material available on the market for exterior insulation. You can select the material according to the weather in your area. Below are some descriptions of the most used material with advantages and disadvantages.

Expanded polystyrene


  • It is a lightweight material
  • It does not make the front of the house difficult
  • Reduced cost
  • Prevents the foundation of mold and moisture
  • Allows the circulation of vapors collected inside the house
  • Opposing high temperatures


  • Because it is synthetic, it is a polluting material
  • It can burn in the fire and can sustain burning
  • It can attract rodents with the animal's name

Extruded polystyrene


  • It has an advanced density than expanded polystyrene
  • An improved thermal insulator than expanded polystyrene
  • Suitable for insulating the basement and foundation
  • Any kind of wear resistant


  • It becomes impossible for the wall to breathe
  • The rotation of the vapors becomes heavier
  • Mold and moisture
  • Moisture can be seen between the insulation and the wall

Polyurethane foam


  • Quick and easy application
  • Complete closure is possible
  • Instant bonding on most construction material
  • Soundproof
  • Low weight
  • Less thickness
  • It does not decompose


  • More expensive
  • It cannot be used equally
  • It can remove the necessary substance during application

Basalt mineral wood


  • It can withstand temperatures of up to 700 ° C
  • Vapor rotation is possible
  • Soundproof


  • Expensive
  • More weight
  • Difficult to install

Glass mineral wool


  • More elastic and flexible than basalt mineral wood
  • Ideal for interior insulation
  • Unevenly shaped walls can be insulated


  • Low quality mineral wood up to basalt
  • Less fire resistant than basalt mineral wood

Exterior natural insulation

Most people like to choose natural materials for exterior insulation to replace synthetic materials. This method was used especially in the old construction techniques. But now, noticing the difficulties of artificial materials, people like to return to the old concept to experience its benefits.

Its main benefit would be non-existent pollution and low construction costs. However, it also has some disadvantages: low resistance to the external environment and a high risk of fire.

The natural elements for the exterior insulation are used to give the house a furnished look and a rustic design. Because its thermal efficiency is undoubtedly, it is mainly used in combination with other chemicals or materials to increase strength. Below are some of the most popular natural elements that can be used for exterior insulation:

  • Cork: It is available in a coarse or expanded version collected by processing from environmentally friendly materials. Provides adequate sound and thermal insulation, increases fire resistance and prohibits the development of mold.
  • Straw: requires negligible processing and thus provides efficient thermal insulation.
  • Reed: It's light, easy to plaster and assemble. In addition, it has good sound and thermal insulation.
  • Hemp: About the same as cane, for example, with good sound and thermal insulation. Moreover, it is permeable to water vapor, can be easily installed and has a high resistance to fungi.
  • Sheep wool: it is fireproof and has a fair temperature.

The exterior insulation procedure of a building

There is a significant difference between the insulation procedure of a built building and a building under construction. However, the difference is related to the preparation phases.

The building under construction requires the drying of the elements from which the wall is built. But if the building is already built, it is necessary to eradicate the plaster.

Moreover, if there are materials such as pipes, then the whole method can be difficult because they have to be moved to complete the insulation.

Below are the main steps once the exterior walls are ready:

  1. Apply the rubber filling on the insulation board material. It should mainly be applied to the edges of the board and in some places in the center of it.
  2. After that, apply the tiles to the wall starting from the base of the corner of the wall. And then go to the last level, climbing progressively and linearly. To avoid any formation of joints, many plates are placed. During this time, the plates should be flattened with a straightening plate.
  3. The reinforcement of the plates follows. Once the boards are glued with filling, holes are made to apply the dowels. The recommended number of dowels is a minimum of 5 for each square meter. A thin layer of filler should be used over the insulation boards after mounting the dowels.
  4. The final step is plaster. When the filling begins to dry, the execution of the finish proceeds more precisely to the decorative plaster. Eventually, the house will regain or get the look it wants.

Bottom line

Because everyone wants their home to be attractive, beautiful and durable, contact a construction specialist. Only a construction specialist can give the right idea about what needs to be done, what material can be used and so on. And one of the essential parts that must be taken into account when building a house are the walls. The walls can provide you with warmth in winter and coolness in summer.

So, you already know about the best exterior thermal insulation for your home from the information above. The best quality items must be chosen even if they are very expensive. But if you buy a cheap material, then the cost of repair would be higher due to the huge damage.

Also, make sure that you do not buy more materials than necessary. Buying more materials can be a waste of money at the end of the paper, which you will definitely not want.

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