One of the best brands for acoustic mineral wool insulation is the rockwool acoustic mineral wool insulation.
Sound insulation bathroom walls.
Go to any home center or insulation company that sells bags of cellulose.
You can also find decorative wall panels wrapped in acoustic cloth designed to double as soundproofing and artwork.
The best way to soundproof a bathroom wall is to add an extra layer of drywall with a damping compound like green glue and a soundproofing material like mlv in between.
Fold up thick fluffy towels on your towel racks and cabinets.
This mineral wool insulation comes as six pieces and weighs 54 pounds.
Comforttherm formaldehyde free fiberglass insulation is wrapped in plastic to reduce itch and dust during installation.
Your first thought of blown in insulation is a good one.
Since sound can be transmitted through the air the material is efficient as it adds bulk and absorbs air and sound from the walls.
It may be possible to do the work from the bathroom side if there are no fixtures on the wall unless you want to work around or over them.
Additionally it s definitely not the cheapest method too.
To reduce echoes arrange the room so that two sections of flat wall face each other.
Soundproofing stone wool insulation 12 bags.
It provides excellent temperature and noise control and comes with a vapor retarder or without a vapor retarder for use in hot humid climates.
This combo requires more time and knowledge.
Otherwise you may find it easier to work from the dining room side.