Roofing: materials, prices, regulations and installation

Latest Advances in Roofing: What You Need to Know

The roofing sector is evolving due to innovations developed by manufacturers, new installation techniques, and increasing demands for energy efficiency and building sustainability. Materials are diversifying, waterproofing and ventilation systems are improving, while solutions integrating roof windows or energy production equipment are gaining importance.

This dossier brings together a selection of articles and press releases published on Batipole to track these developments. It allows you to discover the main roofing materials , their areas of application, selection criteria according to region, costs, implementation rules, and regulatory changes that govern construction and renovation projects.

Roofing refers to all the materials and elements that protect a building from the elements. It contributes to the building's watertightness, affects its thermal and acoustic performance, and plays a vital role in its durability.

What criteria should be considered when choosing a roof covering?

Choosing a roof covering isn't solely based on aesthetics. The type of building, climatic conditions, technical constraints, and local regulations all directly influence the most suitable material. A preliminary analysis helps balance durability, safety, and project cost.

The climate and exposure of the building

Weather conditions are a primary selection criterion. A roof located in a region prone to strong winds, heavy rainfall, or snowfall is not subject to the same constraints as a building situated in a Mediterranean climate. Some materials are more resistant to frost, while others are better suited to high temperatures or humid environments.

The slope of the roof

Each roofing material is designed to be installed on a minimum slope. This incline ensures proper rainwater drainage and limits the risk of leaks. The choice of roofing material therefore depends on the roof's geometry and applicable technical specifications.

The capacity of the framework

The weight of roofing materials varies considerably. Clay tiles, concrete, or slate exert a greater load than steel roofing sheets. When renovating, it is essential to verify that the roof structure can support the weight of the new roof without requiring reinforcement.

Urban planning regulations

The Local Urban Development Plan (PLU) or other local regulations may impose certain materials, colors, or roof shapes in order to preserve the architectural character of an area. In protected zones, additional constraints may also apply before work begins.

The project budget

The overall cost of a roof isn't limited to the price of materials. It also includes site preparation, installation, any necessary work on the roof structure, waterproofing accessories, and future maintenance. Comparing only the price per square meter can lead to an underestimation of the project's true cost.

Lifespan and maintenance

Not all materials offer the same longevity or maintenance requirements. Some roofing materials require regular inspections or periodic cleaning, while others are known for their durability. These factors must be considered when choosing the material in order to anticipate the building's operating costs.

The building's performance

The roof covering plays a crucial role in protecting the building envelope. Combined with appropriate insulation and a properly designed ventilation system, it contributes to thermal comfort, moisture management, and the longevity of the roof structure. Therefore, the choice of roofing material should be considered within the context of a comprehensive roofing plan.

The different types of roof covering

The choice of roofing material depends on several criteria, including the desired durability, budget, structural constraints, climatic conditions, and local building regulations. Available materials can be grouped into several main categories, each suited to specific uses.

Tile roofs

Tiles remain the most widely used material for detached houses in France. They come in several versions to meet architectural, technical and climatic constraints.

The terracotta tile

Made from fired clay, terracotta roof tiles are renowned for their longevity, which can exceed 50 years under good conditions. They offer good fire resistance and thermal performance. However, their significant weight necessitates a sufficiently robust roof structure.

Before choosing this material, it is recommended to check that the building structure can support the load of the roofing.

Ceramic tile

Ceramic tiles primarily encompass terracotta tiles used on residential, agricultural, and commercial buildings. Available in flat, channel, or interlocking models, they adapt to various architectural styles and roof pitches found in different regions.

The concrete tile

Made from a mixture of cement, sand, and mineral pigments, concrete roof tiles are distinguished by their mechanical strength and dimensional consistency. They are available in numerous profiles and finishes to suit various types of construction.

Its weight, generally greater than that of some terracotta tiles, requires checking the load-bearing capacity of the framework, especially during a renovation.

Glass tiles

Glass tiles allow natural light to enter attics or under roofs. They are mainly used in specific areas, for example on a veranda or extension, to let light in without altering the overall appearance of the roof.

Plexiglass tiles

Lighter and more impact-resistant than glass, plexiglass tiles offer an alternative for incorporating transparent elements into a roof. They are easier to install, but their scratch resistance is more limited and they can yellow under the effects of ultraviolet rays.

Metal roofing

Metal roofing is valued for its lightness, speed of installation and good resistance to weathering.

The steel tank

Steel roofing sheets are particularly used on industrial and agricultural buildings, as well as some contemporary housing. Lightweight and economical, they require little maintenance and offer good resistance to weather conditions.

However, appropriate insulation is essential to limit condensation and improve acoustic comfort during rainy periods.

Zinc

Zinc is a roofing material widely used on residential, commercial , and heritage buildings. Prized for its lightness, longevity, and corrosion resistance, it is well-suited to both traditional roofs and contemporary architecture.

Available in sheets or panels, it allows for the creation of complex roof shapes using various installation techniques, including standing seam. However, its implementation requires specific expertise to guarantee the structure's watertightness, ventilation of the underside, and consideration of the metal's expansion and contraction.

Tile panels

Tile-effect panels combine the appearance of traditional tiles with the speed of installation of pre-assembled panels. This solution reduces installation time on some construction sites, although its lifespan is generally shorter than that of terracotta or slate roofs.

Natural stone roofing

Slate

Slate is one of the most durable roofing materials. A slate roof can last for over a century when properly maintained. It effectively resists rain, frost, snow, and hail.

Its installation requires specific expertise to guarantee the roof's watertightness. For this reason, it is generally entrusted to specialist roofers.

Comparative table of the main roofing materials

The comparative table provides an initial guide for evaluating the main roofing materials. However, the final choice depends on the building's characteristics, the local climate, regulatory constraints, and the available budget. The following sections allow for a more in-depth examination of each of these criteria to guide the project toward the most suitable solution.

*The prices indicated are approximate and may vary depending on the characteristics of the site, the material chosen, the region and the cost of installation.

Choosing your roof covering according to your region

North and North-West (Hauts-de-France, Normandy, Brittany) 

These regions are characterized by a maritime climate and frequent, sometimes heavy, rainfall, as well as strong winds. Terracotta tiles or slate are recommended for these areas. They are resistant to moisture and wind gusts.

Southwest (New Aquitaine, Occitanie)

The mild oceanic climate of this region can also be accompanied by strong winds blowing in from the Atlantic. Clay roof tiles remain a popular choice here, blending well with the local architectural landscape.

South-East (Provence-Alpes-Côte d'Azur, Auvergne-Rhône-Alpes)

This area enjoys a Mediterranean climate, with hot, dry summers and mild winters. Clay roof tiles are very common: they are heat-resistant and require little maintenance in dry conditions.

East (Grand Est, Burgundy-Franche-Comté)

With colder winters and heavy snowfall, roofs in these regions must be sturdy and insulating. The use of clay tiles or steel decking panels, for their good insulation and ability to withstand the weight of snow, is recommended.

Center and Île-de-France

In these regions, where the climate is more temperate, different materials can be used. Clay tiles, slates, and even concrete tiles are common choices.

What is the cheapest roofing option? 

Asphalt shingles and steel roofing sheets are among the most economical options.

Asphalt shingles

They are particularly popular in North America but less common in France. They offer good weather resistance and are available in several colors. The average price can range from 20 to 40 euros per m².

Steel tray

Steel decking is economical for large areas (industrial buildings or warehouses, for example). In addition to its affordable cost, it is recommended for its long lifespan, weather resistance, and ease of installation. 

What is the price of a roof covering?

The cost of roofing depends on the material chosen, the complexity of the roof, the surface area to be covered, the accessibility of the site, and the cost of labor. The amounts presented below are only approximate.

Prices vary depending on the region, the complexity of the project, the materials used, and labor costs. A quote from a roofing contractor will provide an estimate tailored to the specific characteristics of your project.

What financial assistance is available to fund the renovation of a roof covering?

In France, financial aid is available for individuals wishing to renovate their roofs, particularly to improve the energy efficiency of their homes. 

MyPrimeRénov '

Depending on the nature of the work and the applicable conditions, some roof energy renovation projects may be eligible for MaPrimeRénov' . As eligibility criteria and grant amounts are regularly revised, it is recommended to consult the official information before starting any work.

Zero rate eco-loan (eco-PTZ)

The eco-PTZ loan can be used to finance certain energy renovation work, including roof insulation when it meets the eligibility criteria. The amount granted varies depending on the work carried out.

Energy Saving Certificates (ESC)

The Energy Savings Certificates scheme can contribute to the financing of work improving the energy performance of housing, in particular roof insulation, subject to compliance with the conditions of the scheme.

VAT reduced to 5,5%

For energy renovation work, including roof insulation, the VAT rate is reduced to 5,5% . This reduction applies to both labor and materials. The reduced VAT rate depends primarily on the type of work and the property. However, RGE certification is often required to benefit from certain subsidies such as MaPrimeRénov' or Energy Savings Certificates (CEE).

Local aid

Regions, departments, municipalities, and other local authorities may offer additional financial assistance for roof energy renovation work. Eligibility requirements, grant amounts, and the possibility of combining this assistance with national programs vary by region. It is recommended to contact the relevant local authorities before starting any work.

What are the standards and regulations for roof coverings?

Roofing work involves more than just choosing materials or installing them. The process is governed by technical and administrative regulations designed to ensure the safety of the structure, its watertightness, and its integration into the surrounding built environment. Therefore, before starting any project, it is essential to verify the applicable requirements.

Unified Technical Documents (DTU)

In France, roof installation is generally carried out in accordance with the Unified Technical Documents (DTU) . These standards define the design and implementation rules according to the material used, whether it be tiles, slate, zinc, or other roofing systems. They specify, in particular, the fixing conditions, overlaps, minimum slopes, and measures ensuring the roof's durability.

Urban planning regulations

Roof renovations may be subject to planning regulations. The Local Urban Development Plan (PLU) may mandate certain materials, colors, or roof shapes to preserve the architectural harmony of a municipality. In protected areas, particularly near historical monuments, additional requirements may apply before work begins.

Requirements adapted to climatic conditions

The technical specifications also take into account the building's location. The roof pitch, the fastening system, and certain accessories may vary depending on exposure to wind, snow, or heavy rain. These constraints help limit the risks of leaks, detachment, or premature deterioration of the roof covering.

Regulations that are evolving

The requirements for roofing work are constantly evolving in line with updates to technical standards, building regulations, and energy efficiency policies. Before undertaking any construction or renovation project, it is recommended to check the applicable rules with the relevant local authority and to consult a qualified professional to ensure the work complies with regulations.

How to install a roof covering?

Installing a roof covering is an operation that requires following a series of precise steps:  

1. Surface preparation

Before installing a new roof covering, it is necessary to dismantle the old roof covering and inspect the frame to ensure that it is solid and in good condition. 

2. Installing the insulation

There are different insulation methods and materials, but one of the most common is the use of insulation panels or rolls of glass wool, which are placed on top of the roof structure.

3. Installation of the under-roof screen

The under-roof screen is a membrane that serves to reinforce the roof's waterproofing and protect it against water infiltration. It is installed before the roof itself and must be properly secured.

4. Installation of the cover

• Tiles: They are arranged so as to overlap, starting at the bottom of the roof and going up towards the ridge.
• Slates: They are individually fixed to the frame using hooks or nails, following a precise alignment.
• Metal, like the steel tray: the metal panels fit into each other and are fixed to the frame with screws.

5. Control and cleaning

Once the installation is complete, it is necessary to check the entire roof to ensure that everything has been installed correctly and that there are no visible defects. 

The Batipole Council

The quality of a roof depends as much on the material chosen as on adherence to installation guidelines. Installation in accordance with Unified Technical Documents (DTU), combined with a suitable roof structure and effective ventilation, helps ensure the roof's durability.