Classi Seal is a professional, patented waterproofing solution applied by hand to the wall facing sides of shower trays or baths prior to installation. The inherent flexibility of the product can accommodate 15mm of movement, making it equally suitable for new build, repair or renovation. This self-adhesive flexible upstand adds a secondary seal between the wall touching sides of the bath rim or shower tray ledge. The flexible upstand has an adhesive strip which fits to the top edge of your bath or tray prior to installation leaving a 30mm upstand. Once plumbed into position this can be tiled or shower boarded over. Classi Seal is an excellent choice for bathroom renovations and new build projects as it can accommodate vertical movement of at least 15mm.