Not trying to intentionally doubt you, however I need to ask...are you sure it's daylight you're seeing and not a reflection? I was looking behind our theatre seating and thought I saw daylight where the floor met the wall. I took out the screws under the seating & slid it away from the wall to get a closer look & found out it was silver material under the carpeting. Probably some kind of insulation material & it reflected light & made it look like the light was from the outside. I was quite relieved that I wasn't seeing daylight. I hope this is the same for you.