Exclusive to Home Hardware, this undelay is for use over concrete or wood substrates above or below grade, and under laminate and engineered wood floors. It is also excellent over radiant heated floors. It diminishes minor sub-floor irregularities, has anti-crush technology for excellent footfall performance and long life, has seal guard for best edge seal, acts as a vapour barrier, and is mould and mildew resistant. Easy to install, it has no V.O.C. emissions and sound performance: STC72, IIC73, Delta IIC 21. Dimensions are: 2 mm / 3/32" thickness; 200 sq. ft.