Earthwool loft roll 44 is primarily used for the thermal insulation of pitched roofs at ceiling level, it can also be used to thermally insulate floors. When used at ceiling level it is usually laid in two layers, with the first layer between the joists and the second layer over, and at right angles to the joists. For pitched roofs at ceiling level and suspended timber floors. Properties Thickness: 100mm. Length: 12.18m x 1140mm - 2 x 570mm / 3 x 380mm. Thermal resistance: 2.25 mK/W. Thermal conductivity: 0.044 W/mK. Fire rating: Euroclass A1 to BS EN 13501-1. Features Earthwool loft roll 44 is a flexible low density glass mineral wool quilt which is lightweight, flexible, resilient and non-combustible. The rolls are 1140mm wide and partially perforated to produce either 2 rolls 570mm wide or 3 rolls 380mm wide. Lightweight and economic insulation quilt. Produced for use with timber joists at 400mm and 600mm centres. Partially cut perforations. Provides thermal, acoustic and fire performance.