How to insulate an already built wall

Insulate walls to avoid the cold in winter

Many of our homes, especially those that were built decades ago, They are not well insulated This means that not only do we end up paying more on our bills, but we also don't have the comfort we would like in times like winter. Luckily, you can insulate an already built wall to improve these conditions. Find out how!

There are different ways of insulate an already built wall so that our home is more pleasant in seasons with more extreme climates such as winter or summer. And no, it is not always necessary to get involved in major works or reach an agreement with the neighbors, if that scares you. Discover all your possibilities.

Why is it important to insulate walls?

Are the walls of your home cold in winter? Do you put heating but the heat seems to be lost? Do you have condensation on your windows? If so, your home is probably not well insulated. And believe us, doing so has multiple benefits such as…

energy saving

  • energy saving: A well-insulated house reduces the need for heating, which consequently significantly reduces bills.
  • Less humidity. A well-insulated home suffers fewer humidity problems, thus preventing mold and other problems.
  • Greater comfort: The temperature in your home will be more pleasant both in winter and summer. If you wear a lot of clothes inside the house, even when you turn on the heating, you will notice a big change. It will be much easier to maintain a constant temperature inside your home.
  • Value added. Good insulation improves the energy efficiency of your home and therefore its value on the real estate market. If you plan to sell or rent your home in the future, it is a worthwhile investment.
  • Acoustic isolationIf you live in a noisy area, insulation will also help you enjoy a quieter environment.

How to insulate walls

You can insulate the walls of your house from the inside or by undertaking a renovation from the outside.There are options for all tastes, for those seeking consensus in their community of neighbors and for those who want to improve insulation personally without demolishing walls or carrying out major renovations.

Colored shelves

  • Internal insulation: It involves adding a layer of insulation to the inside of the wall, which usually involves installing drywall and a new coat of paint.
  • Exterior insulation: Insulation is applied to the outside of the wall, on the facade. It requires permission from the neighbors and is a more expensive option, but more effective in certain climates.
  • Injection of insulating material: Insulating material is injected into the space behind the wall by drilling holes, provided there is room for it. It is a quick, effective and fairly clean method.

Materials you can use

Changing the windows and using thick curtains on the exterior walls will help you gain comfort in your home. However, insulating them with one of the following materials will be even more effective. Know the pros and cons of each of them and after speaking with a professional, choose the most suitable one to cover the insulation needs of your home.

Insulating materials for walls

Insulating materials: Rock wool, cellulose and expanded polystyrene

  • Fiberglass: Fiberglass is a very popular material as it is light and easy to install. Made of fine glass fibers intertwined and bonded by a special resin, it has high thermal resistance and low conductivity, making it a perfect thermal insulator. Once the walls have been insulated with this material, it will be necessary to install plasterboard and finish the walls.
  • Expanded polystyrene: Light, economical and with good thermal resistance, it is mainly used on exterior facades to prevent the cold from entering.
  • Polyurethane Foam: Polyurethane foam is an excellent solution for thermal and acoustic insulation of homes. It can be used in different ways, either by spraying it directly onto the area we want to insulate, or by using shaped sheets or prefabricated panels.
  • Cellulose: Made from recycled paper, it is an eco-friendly option that also provides good sound insulation. Ideal for insulating ceilings and interior walls, it acts as a natural barrier that absorbs heat in winter and retains it inside the house.
  • Rock wool: Ideal for exterior and injection insulation, it is fire resistant and offers excellent acoustic insulation.

As you can see, there are many possibilities for insulating an already built wall. Choosing between one or the other will depend not only on how you want to undertake the process, from the inside or the outside, but also on the budget you are willing to allocate to achieve the objective and the work you are willing to endure. In addition, the peculiarities of your building could limit the possibilities, so do not hesitate to consult a professional.


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