If I have a ship that uses Linear acceleration for gravity with the decks placed perpendicular to the thrust vector I can have gravity and a "floor." When it comes time to decelerate the ship turns 180° and begins burning in the opposite direction. Is my floor now my ceiling?

I have tried to think through this and can see it both ways. The "floor" is still the side with the thrust pushing against it, put the motion is now in reverse.