PETRALIGHT mineral insulation by Petralana, 50 mm

Comfort in a building depends on temperature, noise and how its elements perform in a fire. Mineral wool can contribute to all three areas within one material family. Its fibrous structure reduces heat transfer and absorbs some sound energy, while its mineral origin allows non-combustible insulation products to be made. Different boards and batts bring these properties to lofts, façades and wall cavities.

Air held in the spaces between fibres is central to mineral wool’s insulating performance. Correctly selected insulation reduces heat loss in winter and heat entering through building elements during hot weather. Resilient types fill framed cavities well, making them practical in lofts and lightweight walls. More rigid boards serve façade systems or roofs requiring different mechanical behaviour. The choice of forms makes it possible to match insulation to the element’s geometry and function. Resilient wool adapts to slightly irregular framed cavities more readily than a rigid board. It helps fill the available space without altering the structure solely to accommodate the insulation.

Fibrous material dissipates the energy of vibrating air. In a framed wall, mineral wool works with the linings to help reduce speech and everyday sounds passing between rooms. This is useful between a bedroom and living room, in a home office or in office support areas. The insulation damps resonances in the cavity between boards, helping the complete partition protect the adjoining room. The final result also depends on lining mass, connections and other sound transmission paths. Mineral wool’s advantage is that it can support acoustic improvement while also providing thermal insulation.

Mineral wool products are available with high reaction-to-fire classifications, including A1. This helps when designing insulation where non-combustibility is an important requirement. Wool is also highly permeable to water vapour, allowing drying behaviour to be considered within the assembly. This does not replace room ventilation, but it is an important property of the wall or roof build-up. PIR may provide similar thermal performance at a smaller thickness, whereas mineral wool offers a different combination: non-combustibility, acoustic usefulness and a wide choice of densities and stiffnesses. It suits clients who assess a building through daily comfort and the function of all its layers, rather than insulation thickness alone.

SteelProfil stocks mineral wool and a broad selection of first- and second-grade insulation materials. We offer promotions and competitive prices to help assemble materials for different building elements. We help choose the type that matches thermal, acoustic and operating requirements.