Cavity wall insulation by 123Isolatie
A large share of heat can be lost through poorly insulated exterior walls. We first check whether the cavity is suitable, then choose the material and method that best fit your home.
From €12,- per m²
A large share of heat in a home can be lost through poorly insulated exterior walls. Especially in homes with an empty or insufficiently insulated cavity wall, the heating system has to work harder to keep a comfortable temperature. With a well-insulated cavity wall, heat stays inside longer, comfort improves, and energy bills go down.
At 123Isolatie we don’t only look at how much insulation material can be installed in the cavity. First we assess how the façade is built and whether the cavity is suitable for insulation. Based on that, we choose the material and method that best fit the home.
Our approach is simple: careful workmanship, efficient insulation, and high-quality materials at a fair price.
Heat always moves toward a colder environment. In cold periods it is warmer indoors than outdoors, so a home continuously loses heat through the roof, walls, windows and floor.
In homes with exterior walls made of an inner leaf and an outer leaf, there is often a space between them: the cavity. When this cavity is empty or poorly insulated, heat can escape relatively easily through the façade.
By filling the cavity with suitable insulation material, that heat flow is strongly slowed down. As a result, the heating system uses less energy to keep the home at temperature.
A well-insulated cavity wall can contribute to:
Exact savings differ for every home. Results depend on façade size, cavity width, existing insulation, energy use and how the home is heated.
In a home with an empty or poorly insulated cavity wall, the improvement can be substantial. By reducing heat loss through the façade, the heating system runs less often and for shorter periods.
Possible savings are influenced by:
A cavity wall usually consists of two separate walls with a space between them. From inside to outside, a façade may include, for example:
Materials can pass heat from one point to another. Some building materials conduct heat relatively easily. Insulation materials are designed to limit conduction as much as possible. Filling the cavity slows heat flow through the façade.
In an empty cavity, air can move freely. Filling the space with suitable insulation limits unwanted air movement. Many insulation materials contain small cells, fibres or beads that largely trap air.
Heat can also be transferred by radiation. The overall insulating performance of a façade depends on the full build-up and the properties of the materials used.
Insulation performance depends on thermal conductivity and material thickness, among other factors. A material with strong insulating properties can help limit heat flow through the façade — but final performance is not determined by the material alone.
These factors also play an important role:
Not every cavity wall can be insulated without inspection. Before we insulate, we assess the existing situation — including how the façade is built and whether the cavity is suitable.
A cavity wall can differ in:
A façade is constantly exposed to weather such as rain, wind and temperature changes. If the exterior wall is insufficiently protected or damaged, moisture can enter the structure.
If moisture issues are not resolved before insulation is installed, problems can remain or in some cases increase.
Cavity wall insulation is usually installed from the outside. Small openings are made at various points in the façade, and insulation material is injected into the cavity through those openings.
The goal is to fill the cavity as completely and evenly as possible without unnecessary damage to the façade. In broad terms, the process includes:
A well-insulated cavity wall can strongly reduce heat loss through large parts of the façade. Still, homes often have places where heat escapes more easily. These are called thermal bridges.
Cavity wall insulation can significantly reduce heat loss through the façade, but it does not automatically solve every thermal bridge. That is why our advice looks at the home as a whole.
One of the biggest benefits of cavity wall insulation is extra living comfort. A poorly insulated wall can feel cold. After insulating the cavity, the inner surface of the façade can become warmer and more stable.
Cavity wall insulation can help with:
At 123Isolatie we work with several insulation materials. The best choice depends on cavity width, the existing façade, the desired insulation value and the technical properties of the home.
EPS beads are small insulation pearls that can be suitable for cavity wall insulation. The beads are injected into the cavity and together form an insulating layer.
Mineral wool can also be used to insulate cavity walls. It can suit certain façades and offers sound absorption as well as thermal insulation.
Depending on the existing cavity and technical situation, other insulation systems may also be used. That is why we do not automatically choose one standard material.
There is no single insulation material that is best for every cavity wall. The right choice depends on:
01
We review how the façade is built and assess the overall condition of the exterior walls.
02
We check whether a cavity is present and review the available space and existing situation.
03
We look at damage, pointing, cracks, moisture issues and other factors that may affect the insulation work.
04
Based on the home, we determine which insulation method and material are most suitable.
05
The insulation material is installed using the correct method, with attention to filling the cavity as completely and evenly as possible.
06
After installation, the drill holes are carefully finished and we check the result.
At 123Isolatie we believe good insulation starts with good preparation. We don’t simply choose the cheapest material — we look for the best solution within the available budget.
Our approach is based on: the right inspection + the right material + a suitable insulation method + careful installation.
Whether you choose EPS beads, mineral wool or another suitable material, we focus on what technically and practically fits your home best.
123Isolatie: careful, efficient and focused on high-quality insulation at a fair price.
Find out which insulation step delivers the most for your home — personal and non-binding.
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