On one of our walks in a brand new mall, we ran into this fun wheel barrow. The walls here are solid. They were putting up a wall in a new shop. They put a brick wall up then put a thin coat of cement on the sides of the brick wall. It seems like a lot more work than Sheetrock but it is sound proof. Elder Boyter and I can not hear each other if we are in different rooms in our apartment. We have a small 2 bedroom apartment but we have to be in the same room to talk to each other. The walls make for good neighbors. We can not hear our neighbors.