Products Overview | Wall | Non-Itch Cavity Insulation Slab Cavity Insulation Slab Calculations Insulation within the wall cavity The table below shows the U-values achieved using Non-Itch Cavity Insulation slab 39 placed within the cavity of external masonry walls. U-Value Determined by Block Type (W/m2K) Thickness Dense Block ( 1.100) Medium Block ( 0.340) Areated Block ( 0.110) 65mm 0.44 0.41 0.33 75mm 0.4 0.37 0.3 85mm 0.36 0.34 0.28 100mm 0.32 0.3 0.25 Overview Installation Technical Calculations Data Sheet Quick, clean and easy to install No protective clothing Free from floating fibres Direct equivalent to glass fibre insulation Totally recyclable