A part of the Rockwools Sound Pro range, Rockwool Flexi is a unique insulation product with a patented flexible edge along one side. This unique Flexi edge is produced using patented technology to ensure a perfect fit is maintained between the product & its supporting framework. This ensures the insulations integrity. Flexi is designed for a host of applications where perfect fitting insulation is essential, in walls, partitions, floors & roofs. The Flexi edge allows the product to be tightly fitted between timber & metal frames, without the need for cutting or waste. Product Benefits: * Patented Flexi edge offers accurate fit to all widths * Will not slump if studs shrink * Multi-application, fits all typical metal & timber frame spacing * No waste * Excellent thermal, acoustic & fire properties * Easy to handle & install without gaps Ensuring a perfect insulation fit is essential to maintain the thermal integrity of the wall. Typical softwood timber moisture contents can range between 6% & 30%, dependant on exposure to the elements. As a rule of thumb, timber will expand 1% for every 4% of moisture content. A 100 * 47 mm timber stud can therefore expand 3 * 2 mm (each side) & then shrink back. If insulation is installed when timber has high moisture content, it can result in a potential 6 mm vertical void on each side. When the timber dries out, Rockwool Flexi will expand into this void, ensuring thermal integrity, whilst rigid insulations may leave a 6 mm gap, or even fall out