ISOVER (Saint-Gobain) is one of Europe's leading manufacturers of mineral wool and covers almost all building physics requirements with its insulation solutions. The product range extends from standard insulation materials for residential construction to high-performance products for demanding Passive House projects. For processors on the construction site, the product diversity is both an advantage and a challenge: which insulation material suits which application, and what should you pay attention to during installation?
The most important ISOVER product lines at a glance
ISOVER structures its product range according to applications and building physics requirements. The three main segments are roof, facade, and interior finishing. Within these categories, there are specialized product series that differ in lambda value, bulk density, compressive strength, and fire behavior.
The Ultimate series positions ISOVER as high-performance insulation. With thermal conductivity values starting at 0.032 W/(m·K), these fiberglass wool products are particularly suitable for projects with high energy requirements, such as KfW Efficiency House renovations or new buildings with thin wall thicknesses. In practice, this means: you achieve the same U-value with less insulation thickness, which is crucial in tight roof spaces or with subsequent interior insulation.
For pitched roofs, the Topdec series is particularly widespread. The laminated rafter cavity insulation can be quickly clamped between the rafters and is valued by many roofers for its easy handling. Important during installation: the insulation boards should be cut approximately ten millimeters wider than the rafter spacing so they remain permanently in place without additional fastening. At temperatures below five degrees Celsius, elasticity may decrease – temporary fixation with tacker staples is advisable.
Application and processing instructions for typical construction projects
The ISOVER TF facade insulation board is frequently used in thermal insulation composite systems (ETICS). This pressure-resistant mineral wool variant has a fire class A1 and thus meets the requirements for multi-story buildings. During installation, full-surface adhesive application and additional dowel securing must be observed. The open time of facade adhesives is between 20 and 60 minutes depending on temperature – with direct sun exposure, this time window is significantly reduced. Therefore, plan your work so that you adhere a maximum of two to three boards per installation round.
For dry construction, ISOVER offers acoustic insulation boards with optimized sound absorption. These are frequently used in stud walls or suspended ceilings. Make sure that the drywall boards rest fully and no voids are created, as otherwise sound bridges will reduce the effect. For the highest sound protection requirements, a combination with decoupled profile systems is recommended.
Market position and competitive environment
In the European insulation market, ISOVER competes mainly with ROCKWOOL and Knauf. While ROCKWOOL is traditionally strong in the mineral wool segment, ISOVER focuses on a broad portfolio of fiberglass and mineral wool. Knauf increasingly positions itself through integrated system solutions with its own plaster and drywall systems. ISOVER benefits as a brand of the Saint-Gobain group from a global distribution network and high availability in building material retail chains.
Current developments at ISOVER aim to reduce the CO₂ footprint in production. With increasing recycled content in fiberglass wool and the use of renewable energy in factories, the manufacturer is responding to sustainability requirements in public tenders. For planners, EPD (Environmental Product Declaration) is increasingly becoming a selection criterion – ISOVER already provides EPD documents for many product lines.
Practical conclusion: product selection and material consumption
For economical installation, the right product selection is crucial. High-performance insulation is worthwhile especially with limited space or high energy requirements. Standard products are often the more cost-effective choice for large areas and non-critical U-values. Plan for approximately five percent waste when cutting – for roof slopes with many dormers or valleys, this value can increase to eight to ten percent. Store the insulation boards dry and protected from the weather, as damp mineral wool loses its insulating effect and complicates installation. For questions about product selection, the technical consultants at ISOVER support you with project-specific recommendations.
