Roofing: managing the building's energy performance

Latest Advances in Roofing: What You Need to Know

In this folder, you will find useful resources on the different types of cover roofing. Here we explore the most effective materials and why some choices are better suited to certain regions than others. It's also an opportunity to review building standards and available financial assistance for energy-efficient renovations.

Roof covering is defined as all the materials used to cover the roof of a home or building, to protect it from bad weather and contribute to its thermal and acoustic insulation. 

The different types of roof covering 

The steel tank

Steel decking is known for its weather resistance. It's lightweight and requires little maintenance. Price-wise, it's an economical option compared to other roofing materials. However, steel decking can be prone to condensation under the roof if adequate insulation isn't installed, and it can be noisy in the rain.

The terracotta tile

Terracotta roof tiles are durable and can withstand over 50 years of wear and tear. They are fire-resistant and provide good thermal insulation. Their orange color adds a traditional touch to the home. Terracotta roof tiles are quite heavy and weigh a lot. A reinforced roof structure is recommended. They are more expensive than steel roofing.

Before choosing clay tiles, make sure that your roof structure can support its weight.

The glass tile

Glass tiles maximize natural light in attics or roof spaces. Their insulation level is comparable to that of traditional tiles. They are perfect for conservatory roofs or modern extensions. 

Use glass tiles in certain areas to illuminate specific parts of the house and let the sun shine through.

The plexiglass tile

More impact-resistant and lighter than glass, plexiglass is an alternative for those who want to integrate transparent elements without the drawbacks of glass. Less expensive and easier to install, plexiglass can yellow over time due to UV rays. It is less scratch-resistant than glass.

The tile panel

Tile panels combine the appearance of traditional tiles with the ease and speed of installation. Their lifespan is shorter than that of terracotta or slate tiles.

slate

Known for its longevity, a slate roof can last for more than a century. Slate offers excellent resistance to bad weather, particularly rain, resistance to weathering, particularly rain and hail, frost and snow. Its weight, although less than that of clay tiles, still requires a roof structure that is sufficiently robust to support it.

For its installation, it is recommended to call on experienced professionals: its installation requires a specific technique to ensure the watertightness and durability of the entire structure.

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. We recommend choosing clay or slate tiles in these regions. They are resistant to humidity and gusts of wind.

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 roof covering? 

asphalt shingles and steel pan 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. 

How much does roof covering cost? 

These prices are indicative. We recommend requesting personalized quotes from local suppliers to obtain actual rates.

What assistance is available for renovating 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 '

MyPrimeRénov ' This is a financial aid offered by the State to encourage energy renovation work. It is available to all homeowners, regardless of their income, as well as to co-ownership associations for work in common areas.

Zero rate eco-loan (eco-PTZ)

The eco-PTZ This loan provides interest-free financing for energy renovation work. The amount can be up to €30,000, depending on the scope of the work. Roof insulation is eligible under this scheme.

Energy Saving Certificates (ESC)

The device of Energy Savings Certificates obliges energy suppliers to help consumers save energy, for example, by contributing financially to their energy renovation work. 

VAT reduced to 5,5%

For energy renovation work, including roof insulation, VAT is reduced to 5,5%This reduction applies to labour and materials, provided that the work is carried out by a company qualified with RGE (Recognized Environmental Guarantor).

Local aid

local aid Additional assistance may be offered by regions, departments, or municipalities. This assistance varies depending on where you live and can be combined with national aid.

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

We recommend hiring professional roofers for roof installation. They have the expertise and equipment necessary to carry out the work safely and in accordance with current standards. Ensure that all materials and installation methods comply with the DTU (Unified Technical Documents) for roofing.