Soundproofing

[KEVIN FLYNN]

I have an old (1895) up down two family home that I am thinking about soundproofing. I heard that blown in insulation may be the best option?  Is this a waste of money?  

Thanks for any input 

[Patrick Liska]

It will help, but will not cover it. If you have the money, i would do that plus add a metal z channel going opposite direction of the joists ( screwed on top of the existing plaster ) and then add another layer of drywall. the Z channel leaves a space that helps in sound transmission. the problem is the sound is transmitted through the existing floor joists too, so just the insulation will not do it because the joists are still against the ceiling. this is something similar, but in this picture they used clips in combination to hold off hat channel from the existing ceiling which will lower your ceiling about another inch.