There are Styrofoam drop ceilings inside the house, and above them is a large open space under the tin roof. The Styrofoam is fairly good insulation, but the open space means sound carries through the house, and the tin roof can get loud when it rains hard. More upscale houses will have sheet rock ceilings which cut down on the rain noise, and some upscale houses also have tile roofs which are quieter.