Uncoated, double-density volcanic rock wool panel exclusively designed for use as thermal and acoustic insulation in ventilated façades and deck roofings. It is composed of an upper rigid 100 and 220 kg/m³ density layer and a flexible 40 and 135kg/m³ lower layer. Excellent fire-resistance (A1). Acoustical insulation coefficient is about the unity (0,80 / 0,85).