USB Coll Radon BIT is a self adhesive bituminous impermeable sheet and total vapour and gas barrier, composed of a thin bituminous self adhesive compound, protected with a reinforced aluminium film. This membrane, designed as a vapour and gas barrier, withstands contact with earth, fresh concrete and alkali in general very well. It is therefore ideal for all waterproofing applications of technological premises below ground level, and underground garages and cellars. All surfaces on which USB Coll Solar BIT is to be laid must be dry, clean, smooth and free from impurities. Dirty or damaged surfaces must be cleaned and repaired. If the laying surface is porous apply a layer of USB Primer BIT Riwega (+/- 250 g/sq m). The use of USB Primer BIT is advised and instructions should be followed since the incorrect application of the Primer or failure to observe the times and methods of use will adversely affect the membranes performance.