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Rockwool Insulation, Rollbatt and Flexi Slab. The Thermal Conductivity of Rockwool Rollbatt is 0.044 W/mK. Rockwool Insulation is created from naturally occurring volcanic diabase rock which is smelted and spun into fibres to create a wide selection of insulation materials. Our Rockwool Insulation is of the highest quality while still offering you low cost prices. Buy Quality, Low cost building materials and insulation products. Build4less.ie supplies all building materials to trade and the public at wholesale and trade prices.