If you have a sample brick and mortar, do this:
For brickwork, you are dealing with two densities: brick wall density
There is a law in acoustics called the : Every time you double the mass of a wall, you increase the sound transmission loss by about 6 decibels. A flimsy timber stud wall might weigh 20 kg/m². A dense brick wall? Over 400 kg/m². That is why older brick buildings feel like libraries—density kills airborne noise. If you have a sample brick and mortar,