Knauf 100mm Loft Insulation Roll 11.08m2 Space Bottom Layer Thermal Building Pro
Designed for timber joists at 400 mm and 600 mm centres. 100mm thick glass mineral wool insulation roll. Provides thermal, acoustic and fire performance. Thermal conductivity: 0.044 W/mK. Thermal resistance (R value): 2.25 m²K/W.