Soundproofing interior wall with pocket door

[Altuna]

Considering a built-in sliding door in the wall between the living room and the bedroom. The problem is sound insulation... Can double insulation boards of rock wool be used instead of OSB and drywall? Or at least one board under the drywall... How to get the best sound insulation without wool?

 

[anaitis]

Stone wool hardly insulates against sound at all!
It should be heavy materials with low E-modulus and low stiffness to insulate against sound.

 

[isolde]

If the sliding door is to go into the wall, and you don't have room for rock wool, you will have to settle for double gypsum, or alternatively gypsum+OSB on each side of the wall. I remember a program with Martin Timell where he demonstrated how hollow it sounded without insulation in the wall, and what a difference it made with insulation. Anyway, in your case, the sound will still find its way through the door and gaps, so acoustic insulation shouldn't be taken too seriously. Moreover, it only applies to the part of the wall where the door will fit.

 

[Elvis69]

Considering a built-in sliding door in the wall between the living room and the bedroom. The problem is sound insulation... Can you use double insulation boards of mineral wool instead of OSB and plasterboard? Or at least one board under the plasterboard... How to get the best sound insulation without wool?

2 layers of plasterboard on each side provide decent damping. Personally, I would also complement with mineral wool.

The main issue becomes the door. If it is not dampening enough, a large part of the wall's damping is negated. Also, make sure the door is as "tight" as possible against the floor and frame when closed. A few millimeters of gap can ruin an otherwise good wall.

 

[zankan]

The door is the problem, as I said. The wall's construction matters less in this case. Tightness at the top and bottom. Sweeping strips or similar are needed. But difficult to make it tight enough to achieve decent sound insulation.