Originally Posted by cannon man
floor in front of bathroom door pops when walked on. whats under the tile? can it be screwed down? a cross section of floor would be helpfull.
Most coaches I've seen have 3/4 inch plywood as the subfloor. This is bolted down to the main frame rails. It may also be bolted or tapped screwed to minor floor supports.
That said, if it isn't the tile loose, it could be you have a joint in the subfloor in that area. If the plywood is not tongue and groove, you could have popping in that area. It could also just be the floor has warped a bit due to some moisture. Whatever the case, it will take removing the tile to find the cause.