The Isocheck Screedcheck XL impact improvement systems from Isomass are designed to be placed within a masonry structural floor directly below the screed. This isolates the screed from the structural sub floor, and provides sufficient impact absorbsion to place it amongst the elite when it comes to the top performing low density systems available today. The Isocheck Screedcheck XL9 system features a 9mm closed cell non cross linked foam layer. When installed correctly, the Screedcheck XL systems will enable compliance with Approved Document E 2003 and subsequent amendments in 2004, 2010, 2013 and 2015. The isocheck Screedcheck XL systems features a have been designed to be placed within a masonry structural floor directly below the screed. This isolates the screed from the structural sub floor, and provides sufficient impact absorption to place it amongst the top performing systems available. . 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.