Your expert in isolation of interior walls
Isoleaz assists you with the insulation of your interior walls in Luxembourg.
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Our experts will assist you in obtaining grants for insulating your home.
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We provide personalized support for each project before, during and after the work.
Your insulation expert
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Interior wall insulation in Luxembourg is Isoleaz’s core business. Every project is different: renovating an older property, seeking greater comfort without altering the facade, or working within the constraints of the building or its surroundings. Our experts will visit your property, examine it in detail, guide you toward the solution best suited to your needs, and remain available until the project is complete.
Why insulate your walls from the inside?
Winter or summer, the walls of an uninsulated home allow heat to escape or enter without resistance. This forces heating systems to work harder to compensate, resulting in higher energy bills. Between 20 and 25% of a home’s heat loss occurs through the walls: this is one of the most significant, and therefore one of the most cost-effective, areas to address in an energy renovation project.
There are two ways to remedy this: by working from the outside or the inside. Exterior insulation more effectively eliminates thermal bridges but requires a larger budget and involves work on the facade. Interior insulation, on the other hand, delivers significant thermal performance without altering the building’s exterior envelope, and is generally more affordable. Energy bill savings can reach 25%, making it a particularly popular option among Luxembourg homeowners.
The advantages of insulating walls from the inside
What truly motivates people to choose interior insulation are the tangible benefits they offer from the very first months:
- Significantly improved thermal comfort throughout the year, with a more stable and consistent indoor temperature
- A more moderate investment than exterior insulation, the cost of which can be a real obstacle.
- The work was carried out entirely from the inside, without scaffolding or impact on the facade, resulting in a reduced construction time.
- The end of condensation on cold walls, a source of mold that degrades air quality and the health of occupants
- No changes to the building’s exterior appearance will be made, thus resolving any heritage or architectural issues from the outset.
Disadvantages to consider
Several constraints should be anticipated before starting:
- A reduction in living space, directly linked to the thickness of the insulation, which is significant in small rooms.
- The need to completely vacate the affected rooms for the duration of the work, with all that this implies for daily life
- Inevitable adjustments after installation: sockets, switches, ventilation ducts, finishing touches
- Thermal bridge treatment is less comprehensive than with external insulation, although the results remain very satisfactory in most configurations.
Comparing these points with your actual situation and priorities remains the best way to determine if interior insulation is the right solution for your home.
How to prepare your walls before insulation work?
Even before the first panel is installed, thorough preparation largely determines the success of the project. Several points must be addressed beforehand to ensure the insulation is effective in the long term.
The existing wall covering is the first element to examine. Wallpaper left in place hinders moisture evaporation and compromises the adhesion of the materials: its complete removal is essential before any work begins.
Next comes the inspection of the seals around the windows and doors. Deteriorated seals around windows or doors allow cold air to circulate and directly reduce the effectiveness of the insulation work that will be carried out immediately afterward.
Thermal bridges must be mapped during the design phase, not during construction. These thermal bridging points are concentrated at the junctions between walls and floors or around window and door frames: leaving them untreated creates weak points that compromise the entire insulation system.
One last point not to be overlooked: the fixtures embedded in the walls, such as outlets, switches, and ventilation ducts. Inventorying them before work begins prevents any damage during installation. Our teams take these constraints into account from the planning stage, ensuring that the project runs smoothly without improvisation or unpleasant surprises.
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What materials should I use to insulate my interior walls?
Behind every interior insulation project lies a choice of material that has a significant impact on the outcome: the level of thermal insulation achieved, acoustic performance, long-term moisture management, and overall durability. Luxembourg homeowners now have access to three main product families, each with distinct characteristics.
Mineral insulators
Glass wool and rock wool are the quintessential representatives of this family. The former is made from melted sand, the latter from volcanic rock heated to very high temperatures. Their balance of thermal efficiency, fire resistance, and durability is well-established, all at a price that remains within reasonable ranges. Rock wool stands out due to its higher density and compressive strength, two qualities that make a difference in applications where the insulation is subjected to repeated mechanical stress.
Bio-based insulation
Hemp, wood fiber, cork, cellulose wadding: these plant-based or natural materials are gaining popularity among homeowners who are mindful of the environmental impact of their renovations. Beyond their thermal and acoustic performance, which rivals other types of insulation, these materials offer a particularly useful benefit: they naturally regulate ambient humidity, thus helping to maintain healthy indoor air quality, especially in well-sealed homes. While the initial cost may be slightly higher, for many, the environmental benefits justify the difference.
Synthetic insulation
Expanded polystyrene, extruded polystyrene, polyurethane: this family of materials is distinguished above all by its ability to achieve high thermal performance with reduced thicknesses. In rooms where every centimeter counts, this advantage is significant. Their resistance to moisture is also a major strength. On the downside, their production relies on fossil resources, and their environmental footprint remains less favorable than that of bio-based materials, even if they are technically among the top performers.
Our Isoleaz advisors will work with you to determine the material that best suits your home, taking into account your budget, the layout of the spaces, and your insulation performance requirements.
Installation techniques for interior insulation
To insulate a wall from the inside, two methods coexist on the market, and the choice between them depends primarily on the condition of the substrate and the specific constraints of the construction site.
Insulation under a metal frame
The first method, insulation under a metal frame, involves erecting a structural framework of profiles in front of the existing wall, into which the insulation is then placed. A plasterboard panel is then fixed to this framework to create the interior surface. This approach naturally accommodates the wall’s irregularities without requiring any prior preparation of the substrate. It also offers valuable flexibility for running electrical cables or ventilation ducts.
Insulation using bonded lining
The second method, bonded lining, involves applying panels combining rigid insulation and plasterboard directly to the wall, fixed with adhesive mortar. It is well-suited to walls in good condition with smooth surfaces, and its installation is faster. Many smaller projects or situations where space loss must be minimized are handled using this technique.
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What is the cost of insulating interior walls in Luxembourg?
Several factors influence the budget from one project to another: the total surface area of the walls to be treated, the chosen material, the installation technique, and the building’s specific characteristics. The construction market in Luxembourg has structurally higher cost levels than in neighboring countries, a fact that must be factored into the initial estimates.
For most projects, the budget ranges from €50 to €90 per square meter, excluding VAT, including labor and materials. This minimum can be exceeded depending on the complexity of the work or the quality of the materials selected.
At Isoleaz, a detailed quote is provided within 24 hours, giving you a clear understanding of the actual cost before you commit to anything.
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