Hi, I'm considering "sacrificing" 1.3 cm in a somewhat small kitchen to add an extra layer of drywall against the adjacent bathroom. On this wall, there will be tall cabinets with a freezer/fridge/oven/microwave. Inside the wall, there is a built-in toilet. The studs against the bathroom consist of 95 mm, with rock wool, then OSB + drywall + waterproofing + almost 1 cm adhesive + 13 mm tile.
Does the extra layer of drywall in the kitchen make any difference in terms of sound insulation in this case, with so many layers on the bathroom side and with tall cabinets and heavy kitchen equipment on the kitchen side? I'm mainly thinking about sounds from the built-in toilet, which you don't want to hear in the kitchen.
Does the extra layer of drywall in the kitchen make any difference in terms of sound insulation in this case, with so many layers on the bathroom side and with tall cabinets and heavy kitchen equipment on the kitchen side? I'm mainly thinking about sounds from the built-in toilet, which you don't want to hear in the kitchen.
Probably not.
But plaster is good for soundproofing. Since the decibel scale is progressive, it's hard to translate. Say -2db less with one layer of plaster (qualified guess). Since -3 db in this case halves the sound, -2 db is a slightly smaller reduction, about 2/3. If the sound is very loud, the difference will be noticeable. If it's already at a very low level, the perceived effect will be less with an extra layer of plaster. A toilet flush has some low-frequency sound that will still get through.
If it's a "plop" you're worried about that could reach the kitchen, you could turn on the kitchen fan first
But plaster is good for soundproofing. Since the decibel scale is progressive, it's hard to translate. Say -2db less with one layer of plaster (qualified guess). Since -3 db in this case halves the sound, -2 db is a slightly smaller reduction, about 2/3. If the sound is very loud, the difference will be noticeable. If it's already at a very low level, the perceived effect will be less with an extra layer of plaster. A toilet flush has some low-frequency sound that will still get through.
If it's a "plop" you're worried about that could reach the kitchen, you could turn on the kitchen fan first