We are trying to find a very efficient solution to soundproof (impact noise) between the first floor and the second floor. Since both neighbors agree to do this job, we have access to both to the ceiling (1st floor) and the floor (2nd floor). What would be the very best method to stop impact noise even if it is expensive?
Only looking for ideas at this time.
The very best way is to spray foam the floor joist between the two floors full of insulation. They have a specific spray foam for soundproofing. Then you install noise resistant channels on the bottom side of the floor joist before you install your drywall best to use 5/8 fire-rated. That is the most expensive and the best way to do it.
Jeff from All-In Renovations
Recommended sound proofing includes, roxul insulation "safe and sound" and resilient channel then ceiling or lightweight drywall are fine, this should be sufficient. There are other things if someone is making a sound room but it shouldn't be necessary in regular living spaces.
To achieve the minimum sound transmission rating between the two units, the building code advises to use mineral fiber insulation between the joists (Roxul), sound resilient channels (spaced 600mm) and at least one layer of 12.7mm Type-X gypsum board.
There are different types of resilient channels, some are better than others in reducing the vibration from the floor above. You can also use green glue between two layers of gypsum board, that will add another layer of sound dampening. Concrete topping helps as well, but you need to make sure that the structure is strong enough to carry the additional load.
No matter what you decide to do, make sure that the ceiling/ floor between 2 units has at least 45 min fire-rating and 50 Sound Transmission Rating. According to the National Building Code the assembly above is in most cases will be sufficient for that, although it might vary depending on the floor structure. It's best to consult with your local authorities or professionals before you decide on what you are going to do to ensure that you don't compromise the safety of your house.
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