Hello all, Hoping I can benefit from your expertise on a topic I know next to nothing about. I have some original Victorian tiles just outside my front door (small area, only around one square metre if that), but unfortunately they're at a lower level than both the front door and the driveway causing you to have to step down before you then step up every time you walk out. Also not ideal for drainage. What I'd like to do is raise the level of this area to match the door and the driveway and put in some new reproduction Victorian tiles, but in doing so I want to preserve the original tiles so that I or a future owner could return them to their original state if so desired. I'm imagining I should use some sort of underlay or membrane first, but don't really know where to start and want to avoid doing a DIY botch job that then ruins what are a nice original feature forever. Any advice on the best way of doing it? Thanks!