It is possible to waterproof over most waterproofing systems depending on the state and delamination of the existing waterproofing. When waterproofing over a torch-on, bitumen-based system an adhesion layer is required before you can waterproof over the old waterproofing. DapEnd can be used.
DampEnd forms part of EcoSeal's waterproofing system and when used in combination with HydroSeal HF & Repello it forms a seamless maintenance waterproofing coating for Torch-On systems that will seal delaminated joints, overlaps, outlets and cracked torch-on systems It can also be used as an adhesion layer on bitumen-based systems.