The Isomass Monodeck Mat 15 is a tri-layer underlay mat with an 8mm ACF foam core that is designed to reduce airborne and impact sound transmission through timber floors. By incorporating an 8mm ACF core, this will provide impact and airborne improvement for timber floors. The Monodeck Mat 15 is great for floor upgrades, improving sound reduction under engineered floors and on stairs. To be used over floorboards for conversions, refurbishments or listed buildings requiring minimal structural change as illustrated. . 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.