We adhere the frames to the wall with an industrial-strength double-sided foam tape; this tape adheres to most any wall surface: tile, metal, wood, drywall, wallpaper, painted brick, concrete, vinyl, paint, ceramic, glass, plastic, etc. Though 'permanent' (several indoor advertising companies utilizing these frames have had them installed for more than 12 years in the same place), we will include instruction on removing the frames, without wall damage, should you ever need to do so.