Karma Visco 17 is a shallow acoustic overlay boards designed to damp vibration and attenuate impact and airborne sound passing through floors with minimum loss of room height. They comprise substrate layers of moisture resistant MDF combined with fibreboard separated by sound damping strips. A resilient layer of acoustic felt is adhered to the underside. Benefits of SoundLay Plus Shallow construction - only 17mm Acoustic felt contours over minor irregularities BBA certificate 92/2826 applies Can meet Part E with resilient bar ceiling Can also be used on concrete floors Technical Board dimensions: 1175 x 575 x 17mmLaid area per board: 0.675 m2Board weight: 9.1 kg/m2