A house brick often has a hollow in one surface, known as the 'frog'.
BBC practice is to lay bricks with their frogs uppermost (which is not always the case in conventional building practice) because then they have to be filled completely with cement.
This makes the wall heavier than it may otherwise have been, and therefore a little bit better at soundproofing.Come on the FREE COURSE TOUR
Great home recording starts with a great home recording studio. It doesn't need to be expensive if you know how to select the right equipment for your needs.