Rock wool is a mineral insulation material offering excellent thermal performance and outstanding fire resistance. At Torregra, we use it for specific blown-in insulation projects, always after inspecting the wall cavity and assessing which material is best suited to the home.
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Rock wool is a mineral wool made from molten rock transformed into fibers. In loose-fill form, it can be used for blown-in insulation in air cavities, suspended ceilings, and certain under-roof spaces.
It is notable for its thermal performance and fire resistance. Its exact properties depend on the specific product, available thickness, and installation density.
| Property | What it provides | What to keep in mind |
|---|---|---|
| Thermal insulation | Reduces heat transfer through the building envelope. | Conductivity and the final result depend on the product, thickness, and density. |
| Fire performance | There are blown-in insulation products classified as A1 (non-combustible). | The classification of the specific product installed must always be verified. |
| Water-related behavior | Certain products are water-repellent and exhibit low water absorption. | It does not replace the diagnosis or repair of dampness or water infiltration issues. |
| Stability within the cavity | When installed at the appropriate density, it remains stable within the cavity. | Density and application must be adapted to the system and the type of cavity. |
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We inspect the chamber with an endoscope to check its condition and determine if it is suitable.
We define the access points and the installation density appropriate for the system.
We introduce the loose-fill rock wool using pneumatic equipment until it is distributed throughout the cavity.
We seal the access points and check the finish upon completion.
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At Torregra, we use rock wool only when it suits the construction and the project’s thermal requirements. Before recommending it, we verify the existence of a suitable cavity or space and assess whether its performance characteristics are the most appropriate compared to other materials.
| Application | Primary objective | When it can be applied |
|---|---|---|
| Walls and facades with a cavity | Improving the thermal insulation of the building envelope. | When the cavity has adequate thickness, continuity, and condition. |
| Suspended ceilings | To reduce heat exchange through the upper part of the room. | When there is an accessible space and the suspended ceiling allows for the intervention. |
| Attics and loft spaces | Improving the thermal performance of the top floor. | Depending on the configuration of the floor slab or the space beneath the roof. |
| Cavity walls | Reduce heat loss in winter and heat gain in summer. | When there is an accessible cavity suitable for blown-in insulation. |
It is a mineral insulation material made from molten rock spun into fibers. In loose-fill form, it can be used for blown-in insulation in wall cavities and other suitable spaces.
Rock wool is a type of mineral wool. Glass wool also belongs to this family, but it is manufactured from different raw materials, and each product has its own specific performance characteristics. The choice depends on the project and the installation system.
During installation, the fibers can cause mechanical irritation, so appropriate protective equipment is used. Once blown in, the material remains confined within the cavity.
Many blown-in rock wool products have a Euroclass A1 rating. The classification should always be verified in the technical data sheet for the specific product.
Products specifically designed for blown-in application may exhibit low water absorption, but rock wool must not be used to conceal leaks, capillary action, or other moisture-related issues.
We inspect the air cavities and select the insulation based on your home's construction and actual needs.