Why choose Avenir Renovations?
What is a sandwich roofing panel?
A sandwich panel is a 3-in-1 roofing element:
- A galvanized steel, lacquered or ribbed outer face that ensures waterproofing
- An insulating core made of polyurethane foam (PU), rock wool or extruded polystyrene
- An inner face (visible ceiling) made of steel, aluminum, polyester or wood imitation
These panels are installed directly on the framework or purlins, without adding an under-roof screen or additional insulation.
Steps for installation or renovation with sandwich panels
The installation or renovation with sandwich panels takes place in 4 steps: preliminary diagnosis, preparation of the support, installation of the panels, and then cleaning and acceptance.
Why choose sandwich panels for your roof?
Sandwich panels for roofs offer numerous advantages: they incorporate effective thermal insulation, ensure immediate waterproofing upon installation, allow for quick and economical installation, while providing a clean and aesthetic interior appearance without requiring additional finishes.
Thanks to their insulating core, sandwich panels offer a high thermal resistance (up to 8 m².K/W), far superior to a traditional roof with internal insulation. They significantly reduce:
- The heat loss in winter
- The overheating in summer
- The external noise
The sandwich panel forms a continuous barrier against water, wind, and air. It is ideal for preventing:
- The infiltrations through joints
- The condensation under the roof
- The thermal bridges
Being both insulation, covering, and ceiling, the sandwich panel reduces the implementation steps and allows for time savings on the site. Less labor, fewer materials, and thus a total cost that is often more advantageous.
The underside of the panel can be customized to provide a clean and aesthetic ceiling without additional work (white, wood, ribbed, etc.). It is an ideal choice for a garage, workshop, or garden shed without additional cladding.
Price for a sandwich panel roof in Belgium
The price of a sandwich panel roof varies according to the thickness of insulation, the finish, the area, and the complexity of the project. Here are the parameters to consider.
Factors influencing the price
- Thickness and type of insulation: polyurethane, rock wool, PIR
- Area to cover: decreasing rates starting from 50 m²
- Complexity of the roof: slope, dormers, accessories, edges
- Type of building: residential, agricultural, or industrial use
- Interior and exterior finishes: white underside, wood imitation, painted sheet metal
- Accessibility of the site: height, scaffolding, safety
Average observed price (VAT included, supply and installation included)
| Type of sandwich panel | Average price per m² |
| Single panel 40 mm (garage, annex) | 60 € to 90 € / m² |
| Insulated panel 80 – 100 mm (habitat) | 90 € to 130 € / m² |
| Tile imitation or decorative panel | 100 € to 150 € / m² |
| Finishes (edges, flashings, drains) | 20 € to 50 € / linear meter |
| Complete personalized quote | Free after on-site visit |
Common applications
- Garages, carports, shelters, annexes
- Contemporary houses (single-pitch roof, flat roof)
- Agricultural buildings or sheds
- Shops, offices, workshops
- Pitched or slightly sloped roofs (min. 5 to 10 %)
- Renovation of existing roofing (replacing tiles, fiber cement, steel trays)
Types of sandwich panels available
| Panel type | Features |
| PU insulating panel | Very high insulating power, lightweight, residential or professional use |
| Rock wool panel | Better acoustic insulation and fire resistance |
| Tile imitation panel | Traditional aesthetic, quick installation, integrated insulation |
| Ribbed or trapezoidal panel | Ideal for agricultural, industrial buildings or annexes |
Thickness of sandwich panels
Panels are available in several thicknesses according to the desired performance:
| Thickness | Use |
| 30 – 60 mm | Shelter, garage, unheated carport |
| 80 – 100 mm | Insulated housing, annex with heating |
| 120 – 160 mm | New construction or compliant with PEB standards |
Why choose Avenir Rénovations Belgium?
- Expertise in installation of insulated sandwich roofing
- Compliance with Belgian PEB and DTU standards
- Advice on thickness, panel type and appropriate ventilation
- Clean, quick and guaranteed interventions
- Custom solutions for homes, businesses or agricultural buildings
Request your free quote for a sandwich panel roof
Do you want a waterproof, well-insulated and easy-to-install roof, for residential or professional use?
Contact Avenir Rénovations Belgium for your sandwich panel roofing project, with a custom study, professional support and guaranteed installation.
Contact us now for a free on-site visit and receive your detailed quote, with no obligation.
Frequently Asked Questions – Sandwich Panel Roofing in Belgium
Is the sandwich panel suitable for a primary residence?
Yes, provided you choose a panel with an appropriate insulation thickness, generally between 80 and 160 mm. Sandwich panels with polyurethane or PIR foam offer thermal performance compliant with PEB standards, and are perfectly suitable for residential use.
Is the sandwich panel waterproof and airtight?
Yes. Thanks to their monobloc design, sandwich panels provide immediate waterproofing against water, air, and wind. When properly installed, with the appropriate accessories (ridge, edge, junction), they offer continuous protection against the elements.
Is there a risk of condensation under a sandwich panel roof?
The risk is low if the installation is done correctly. It is essential to:
- Choose a panel with an integrated vapor barrier or install a vapor barrier on the interior side
- Properly ventilate the space under the roof
- Provide ventilation grills or vents if necessary
Our teams ensure that your project complies with all ventilation and insulation rules to prevent condensation and associated issues.
What is the lifespan of a sandwich panel roof?
On average, a well-installed and maintained sandwich panel can last 30 to 40 years, or even longer with good anti-corrosion treatment and proper installation. The material requires minimal maintenance and withstands climatic conditions well.
Can a sandwich panel be installed on an old frame?
Yes, provided that the frame is structurally sound and properly sized. Sandwich panels are lightweight but require a stable, straight, and regularly spaced structure to ensure optimal fastening.
We systematically check the load-bearing capacity, spacing of the purlins, and the strength of the support before any installation.
