styrofoam insulation?

[freakkguitarist]

i have, and can get tons of the 4 inch thick hard styrofoam insulation from my dad. the stuff seems like it would be good to put inside walls for isolation, do you thing a layer of foam, a small gap, then another layer of foam would be good enough to block out sounds coming though the wall?

 

[Ethan Winer]

FG,

Sorry, but styrofoam insulation is useless for sound isolation. Isolation depends on mass in the walls and decoupling one wall from another, and styrofoam has no mass.

--Ethan

 

[freakkguitarist]

really? the stuff is extremely solid and heavey, its 4 inches and its the kind that DOESNT compress whatsoever.

 

[Rod Gervais]

really? the stuff is extremely solid and heavey, its 4 inches and its the kind that DOESNT compress whatsoever.

Ethan is 110% correct - foam has no value whatsoever for what you want to accomplish.

Not even inside of a wall cavity as a part of an isolation assembly.

Rod