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What is better bricks for a soundproof wall, outdoor sounds.... hollow bricks or solid bricks .....and why.
A lot of sound is reflected by the first surface of the wall. A hollow wall means two surfaces to reflect the sound so it might do a better job of soundproofing.It probably depends on a lot of things like the wavelength of the sound.
I think porous materials such as foam would make the best sound insulation. And a solid foam block may be better than a hollow one. Does the wall need to be structural? Durable? You might also benefit from foam sandwiched between two brick layers or foam filled hollow concrete blocks.Also, are you interested in sound reflection or dampening inside the structure?
If this"Yes additional reflective surfaces do help, but the measurement of transmission loss through a wall includes both reflective and adsorption losses. Transmission loss is mainly dependant on density rather than material type." is true, how come sound carries so well under water?Hanging a curtain on the wall may also help.