Fiberglass insulation thickness for roofing

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Discover our selection dedicated to fiberglass insulation thickness for roofing, designed to optimize the thermal and acoustic insulation of your attic. At Ombre Intérieur, we know that choosing the right insulation is crucial for your home's comfort. This collection brings together products with various weights and densities, perfectly suited for roof slopes, ceilings, and walls. Explore high-performance solutions that combine energy efficiency and ease of installation for successful insulation projects.

Why choose the right fiberglass insulation thickness for your roof?

The fiberglass insulation thickness for roofing directly determines the thermal resistance (R-value) of your insulation. The greater the thickness, the better the performance. For a roof, current recommendations suggest thicknesses of 200 to 300 mm, depending on the climate zone and your attic configuration. Optimal insulation reduces heat loss in winter and maintains coolness in summer, while limiting thermal bridges.

Standard thicknesses: 100 mm, 120 mm, 150 mm, 200 mm, 240 mm, 280 mm.
Thermal resistance (R-value): From 2.5 to 8 m².K/W depending on the chosen thickness.
Available formats: Semi-rigid rolls or panels, easy to cut.

Technical criteria to consider

When making your selection, consider the density and thermal conductivity coefficient (lambda). The fiberglass insulation in our collection features a lambda of 0.030 to 0.040 W/m.K, ensuring high-performance insulation. For roofing installation, choose products with an integrated vapor barrier to prevent condensation. Standard dimensions (width 120 cm) fit the spacing of rafters.

How to properly install your fiberglass insulation under the roof?

Installing the fiberglass insulation thickness for roofing requires some precautions. Ensure the insulation is well-fitted between the rafters, without gaps, to avoid thermal bridges. Use an insulation knife for clean cuts. For roof slopes, secure the insulation with staples or battens. Remember to leave an air gap between the insulation and the roof covering for ventilation.

Required tools: Insulation knife, tape measure, stapler, protective gloves.
Installation tips: Start installing the insulation from the bottom of the slope, working upward toward the ridge.
Precautions: Wear a mask and goggles to avoid irritation.

The benefits of well-dimensioned roof insulation

Properly dimensioned insulation with the right fiberglass insulation thickness for roofing improves thermal comfort all year round. It reduces external noise (rain, wind) and contributes to significant energy savings. Additionally, it enhances your property's value by increasing its energy performance. Choose a durable and effective solution for your home.

Our selection of thicknesses for all your projects

Whether you are insulating unused attics, converted attics, or a flat roof, our collection offers suitable thicknesses. For optimal insulation of converted attics, opt for 240 mm or 280 mm. For unused attics, 200 mm is often sufficient. Explore our references to find the ideal thickness for your project.

Converted attics: Recommended thickness of 240 to 300 mm (R ≥ 7).
Unused attics: Recommended thickness of 200 to 240 mm (R ≥ 6).
Flat roof: Recommended thickness of 120 to 200 mm depending on the structure.

Tips for choosing your fiberglass insulation

Consider the area to be insulated and your budget. Rolls are more economical for large surfaces, while panels are more rigid and easier to handle for small areas. Also check for ACERMI or CSTB certification to guarantee performance. Find the solution that meets your needs at Ombre Intérieur.

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Frequently Asked Questions

What thickness of fiberglass insulation under roofing is recommended for optimal insulation?

For optimal roof insulation, the recommended thickness is generally between 200 and 300 mm, depending on your climate zone and attic configuration. A thickness of 200 mm offers a thermal resistance R of approximately 5 m².K/W, while 300 mm can reach R=7.5, significantly reducing heat loss.

What is the difference between a 100 mm and 200 mm thickness of glass wool insulation for roofing?

A thickness of 100 mm offers a thermal resistance R of approximately 2.5 m².K/W, which is insufficient for effective insulation according to current standards. In contrast, 200 mm doubles the performance with an R of around 5, ensuring better thermal comfort and greater energy savings.

How to choose the thickness of fiberglass insulation for roofing based on the roof pitch?

The roof slope does not directly influence the required thickness, but rather the ease of installation. For low-slope roofs, choose rigid or semi-rigid panels that do not slip. The thickness should be determined by the desired thermal resistance, typically 200 to 300 mm for effective insulation.

What thickness of fiberglass insulation under the roof is required to comply with current thermal regulations?

The thermal regulation (RE2020) recommends a thermal resistance R of at least 6 m².K/W for roofs, which corresponds to an insulation thickness of approximately 240 mm of fiberglass (depending on the product's lambda value). For the coldest areas, 300 mm (R=7.5) may be necessary to achieve the required performance levels.