Could you advise on the general maintenance requirements for IKO Superflex Torch On Capsheet? For example does it need to be painted etc. You can contact the technical department on email@example.com. They will be able to provide you with the relevant documents. I want to use IKOpro Synthaprufe as a DPM in a bathroom with a solid concrete floor. Can I then use flexible tile adhesive to fix tile backboards prior to tiling with ceramic tiles? If I put decking on top of your felt covering (on a flat roof) will that void your manufacturers warranty?