The Isocheck ULTIMO system from Isomass is designed to reduce sound transmission through traditional joisted timber floors, where access to ceilings may be limited. Isocheck ULTIMO is made up of a 5 - 6mm Isofiba resilient layer bonded to a 10mm fibre reinforced gypsum board comleted with a bonded top layer of 9mm thick tongue & groove moisture-resitant board. When installed as part of a complete sound reduction system, it enables a timber floor to meet the sound transmission regulations of Approved Document E 2003 and subsequent amendments in 2004, 2010, 2013 and 2015. Applications To be used directly over existing floorboards in conversions, new build and listed building projects. Suitable for projects which include directly-fixed or low-mass ceilings, for example, flats over commercial properties or timber frame flats. Could be installed as illustrated or approved by Isomass. . Isomass offer a free acoustic detail design service to Building Materials Nationwide Ltd customers, please visit the contac t us page to get in touch.