Why choose Avenir Renovations?
Why insulating your roof is a priority in any renovation
Roof insulation is often the first step recommended during an energy audit. It offers immediate gains in terms of efficiency, comfort, and savings.
Significant thermal losses
Without insulation, the heat produced by heating escapes quickly through the roof, especially in the case of an unconverted attic or open lofts. This leakage forces you to heat more, which considerably increases the energy bill.
The energy savings generated by good insulation are felt from the first bill and allow for a quick return on investment.
Uneven thermal comfort
A poorly insulated home often shows temperature differences between floors, a feeling of cold in winter, and overheated rooms under the loft in summer. Roof insulation helps stabilize the indoor temperature year-round.
It also contributes to improving acoustic comfort by reducing external noises such as rain or wind.
A direct impact on the EPC score
The EPC certificate (Energy Performance Certificate) is an essential criterion in the sale or rental of a property. Good roof insulation helps improve the ranking and value of the home.
It is a real asset in the real estate market, especially for older homes to be renovated.
The roof insulation techniques offered by Avenir Rénovations
We adapt the insulation method according to your roof (flat or sloped), the use of the attic (habitable or not), and your budget.
Why call on Avenir Rénovations to insulate your roof?
Insulating a roof requires precise technical expertise, a choice of suitable materials, and flawless execution.
Before any intervention, we inspect the framework, ventilation, waterproofing, and condition of the materials. We determine the most suitable technique for your configuration.
We also analyze the feasibility of additional insulation or a combination with other work (installation of VMC, roof replacement...).
We only use certified insulators, resistant to moisture, compatible with PEB requirements, and compliant with Belgian standards. We also offer bio-sourced solutions for ecological projects.
Our suppliers are selected for the quality and durability of their products to ensure long-term thermal performance.
We help you to:
- Identify available aids (housing grant, Renolution, etc.)
- Prepare the grant application file
- Plan interventions without disrupting your daily life
- Anticipate interactions with other renovation lots (carpentry, ventilation, heating…)
We remain by your side from the initial study to the end of the project.
How much does roof insulation cost in Belgium?
| Type of roof insulation | Average price including tax / m² |
| Internal insulation | 40 to 70 € |
| External insulation (sarking) | 80 to 130 € |
| Flat roof insulation | 60 to 100 € |
The price varies according to thickness, type of insulation, accessibility, and the condition of the existing covering. A personalized quote is established after an on-site inspection.
FAQ – Roof insulation in Belgium
Which technique to choose: from the inside or the outside?
It depends on the configuration:
- If you are not changing the roof covering, interior insulation is simpler and more economical.
- If you are replacing the roof, sarking is preferable: it offers continuous insulation and avoids thermal bridges.
We help you choose the method best suited to your home and your energy goals.
Can you insulate a roof without replacing the covering?
Yes. Interior insulation allows you to keep the existing covering. It is done from the attic or the converted rooms, without modifying the exterior.
It is a common, quick, and economical solution, provided that the covering is in good structural condition and watertight.
What insulating materials do you recommend?
We work with different insulators, depending on your needs:
- Mineral wool (glass, rock): good quality/price ratio, easily available
- PIR: very efficient, low thickness, ideal for sarking
- Wood fiber or cellulose: excellent summer comfort, natural moisture regulation
Each material is selected for its thermal performance, durability, and suitability for your roof.
How long do the works take?
- Interior insulation: 2 to 5 days
- Sarking (outside): 1 to 2 weeks depending on surface and covering
- Flat roof: 3 to 6 days
We plan the work to minimize inconvenience and ensure a quick and clean execution, even during the occupation of the home.
Does good roof insulation improve acoustics?
Yes. Effective insulation helps reduce external noises (rain, wind, traffic…) and improves indoor acoustics, especially under the loft. This increases the overall comfort feeling in the rooms located on the upper floor.
Protect your comfort starting with the roof
A well-insulated roof is the first step towards an energy-efficient, comfortable, and valued home.
Trust Avenir Rénovations for durable insulation that meets Belgian standards and is perfectly suited to your situation. Contact us for a free technical study and a tailored quote.
