Isocheck 23C acoustic floor systems is designed to reduce impact sound transmission through concrete floors, this system does not need the additional protection of a moisture barrier (VCL) vapour control layer because the Isopoli will not absorb the moisture from a virgin screed. Isocheck 23C consists of a 5.5 mm layer of cross-linked Isopoli bonded to 18mm P5 V313 moisture resistant chipboard. When installed as part of an Isomass approved party floor construction it enables a concrete floor to meet the sound transmission standards of Approved Document E 2003 and subsequent amendments in 2004, 2010, 2013 and 2015. To be used over concrete floors for conversions, refurbishments or new build with a new ceiling. . 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.