Top 4 Best Insulation for interior walls of 2019 :

What is interior wall insulation?

If one lives in colder places then he/she might already know the importance of keeping one’s place heated at all times. However, running a heating system at all times and especially if the system needs to work overtime due to continuous cooling down of the room, then the electricity bills can be sky high. Therefore, to keep the electricity bill low and save energy one needs to insulate the walls temporarily or permanently.

 Best insulation for interior walls will prevent the internal heat getting dissipated into the outer environment. It also prevents the outer cold to seep through the walls, which will prevent the heating system to work overtime.  Wall insulations come for both cavity filled walls and solid walls. In comparison to cavity filled insulation and external insulation, internal wall insulation is way more effective, cheaper and easier to install. One can apply the insulation by themselves or with the help of a technician.

While buying the best insulation for internal walls, one needs to keep in mind its U value which is the measurement of the rate at which the insulation surface loses its heat. The insulation of the internal wall also creates an airtight layer which covers the fissures and gaps which can be a cause of loss of heat. One can apply the internal wall insulation either directly to the solid wall or can create a stud wall on which the insulation can be applied on a temporary basis. This will prevent the permanent wall from getting damaged and will also stop one from fixing and re-fixing the wall attachments and items.

Types of interior wall insulation

If one is thinking about insulating their houses’ interior walls, then there are a number of options to choose from. However, it is not just the material that should be chosen, but the overall efficiency of the insulation. Mostly there are two factors that should be the criteria to choose an insulating material; one is the R-value and the other is the wall on which the insulation will be applied. Always look for a material which has a higher R - value which means it will have a better thermal performance and will give better insulation.

Some of the most common insulation material types are:

  1. Blown-in insulation: 

  2. It is one of the most common types of internal wall insulation as it has higher thermal performance and it also costs lower than the other materials. The material used in blown-in insulation is fiberglass foam and one can easily apply it on their own. One of the best things about fiberglass, foam is that it covers the entire wall and makes it airtight by covering all the spaces and gaps which does not allow the heat to escape to the outside environment.                                                                               

  • Stone wool insulation:

  • Stone wool is a porous insulation material which is perfect for insulating the walls against the cold air and to prevent the hot air from escaping. The porosity of the stone wool traps the air passing through it. Also, it is a great way to insulate a house against loud noises. Many people prefer stone wool because it is safe as it does not propagate fire due to its non-combustible nature.                                                               

    Best insulation for interior walls
  • Foil insulation:

  •  Everyone knows that aluminum foils are a great way to trap the heat and prevent it from radiating outside by reflecting it back to its source point. Therefore, it is one of the best insulation for interior walls. Initially, it was a lesser known insulating material, but with time people are getting acquainted with its benefits. Oil insulation is also cheaper as compared to others and it just does not slow the

    radiating process but stops the entire process.

  • Insulation boards: 

    Rigid boards are really helpful in keeping the heat inside and are also very easy to apply. These rigid foam boards are made of polyurethane or polystyrene and are applied to ceiling and floors. These boards are not too thick, but have a higher insulation value, thus one can keep their home safe and warm without putting much pressure on the wall.

    Advantages of the internal wall insulation

    Many people tend to apply wall insulation during the construction of the house. But, in case there is no insulation or one lives in a very cold region than having the best insulation for internal walls can save energy and also keep the house warm. Some of the advantages for which people go for internal wall insulation are:

    • Save energy: Having a colder home and running a heater on overtime can lead to higher electricity and utility cost, especially if the house is big and there are a lot many rooms to be cooled and heated. With a layer of insulation applied to the walls, one can be sure of the fact that the rooms will be temperature controlled throughout the year. Good insulation will not only lower the utility costs, but will also keep the home safe from extreme temperature fluctuations.

    • Sound dampening: Insulated walls will prevent the room to room transfer of sound. Sound can travel through any kind of material and framing. This is why most of the houses are not sound proof. One can use insulator to reduce the flow of sound from one room to another.

    • Safe from fire: Walls, which separate one space from another are called as partition walls which help in keeping both the spaces separate. However, other than preventing the sound from passing from one place to another, it also helps in keeping the fire separated in the case of any fire accident. Insulation helps in keeping the rooms safe during any kind of fire as it starts acting like a drywall.

    How to choose the right internal wall insulation?

    Some of the factors that one needs to keep in mind while choosing some of the best insulation for internal walls are:

    • The thickness of the insulation: Greater the thickness of the insulation, better will be the effectiveness. Therefore one should keep the insulation thickness between 10mm to 100mm.

    • Moisture resistance: Depending on the amount of moisture a wall will have to face, one can choose a material which is either hydrophobic or hygroscopic.

    • Thermal bridging: The chosen material should also be capable of covering the areas which are not part of a solid wall.

    Some of the best wall insulations

    Certain products which can be used to insulate the walls are discussed below.

    1. JOHNS MANVILLE R-19 fibreglass insulation

    This is one of the best fiberglass insulation rolls which can be used on one's internal walls. The R-value of the fiberglass is of 19 which will easily trap the heat and will effectively stop unnecessary noises. The thickness of the insulation is 6.5 inches and the overall size of the batt is 23 inches x 39.2 inches.


      • It is highly effective

    • It is highly durable.
    • Will prevent the sound from entering the room


    • The size of the insulating material is small as compared to others.

    The size of the Reach double is 125 feet x 2 feet and it is made of recycled material. The polyethylene insulation roll has the air double reflective technology. In the air double technology, there is air between the polyethylene layers. This helps in keeping the sound and cold outside only. One can easily install the roll without much work and stress and the entire process can be done through the guidance video.


    • It is easy to apply and no protective clothing and apparatus are needed.  
    • Air double technology provides extra insulation.

      The durability is great.

    • The durability is great.
    • It can be used in any part of the house.


    • The size of the insulating material is small as compared to others.

    3. Premium heat reflective aluminum roll

    This product is created by Miloo and this by far is the best aluminum foil which can be found. This aluminum foil can be used anywhere one wants, like the rooms, attics, garage, shed, warehouse, floors, water pipes, etc. It is made of 100% aluminum foil which is of completely reflective nature. The foil can stop 98% of the heat from getting lost, thus showing stronger heat resistance. The foil also has better resistance against moisture and mold which can slowly ruin any kind of the insulation layer.


    • It can effectively stop heat from leaving.
    • It is water resistant.


    • Applying the foil can be a small hassle.
    1. 4. Roxul mineral wool insulation sheets of 2 inch thickness

    One will get 6 sheets made up of mineral wool, which is a great material for internal wall insulation. It is made up of natural materials and thus one does not have to worry about one's health in these using sheets.


    • One can experience lesser acoustic interference as it is more effective in stopping sound.
    • The wool is resistant to moisture.
    • It has higher heat resistance which means it will not burn easily


    • Sometimes installation requires professional help.
    • One should wear protective clothing while installing the sheets.

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