BauderROCK is a dual density mineral wool insulation board with a multi-purpose facing applied to the top surface to allow waterproofing membranes to be mechanically fixed, torch-applied or adhered. The dual density composition provides a good compressive strength, whilst keeping the overall weight to a minimum. The product is non-combustible with superior acoustic performance. The underside of the board is un-faced, so bare Rock. Where more than one layer of insulation is required to hit the target u-value, an un-faced base layer is used.