Hello!
In a space that was previously not a residential area, I am decorating an extension of my apartment in a multi-family building. I must meet fire and sound requirements.
The existing wall between the new apartment part and the stairwell is 9.5 cm in a concrete-like, porous material, non-load-bearing. (The house was built in 1949.) I have been advised to leave an air gap (1-3 cm, the wall leans) on the inside, and then build with metal studs in the floor and ceiling, standing wooden studs 45 x 45 cc 60 with fiberglass wool in between. Then plywood 12 mm and plasterboard 13 mm. Could someone kindly confirm that this, together with the existing wall, meets Ei 60?
Now to the actual problem. In the wall, there is an existing door that I will close up, but still want to keep in case I change my mind later. The door opens outward; from the stairwell, the door will remain, but from the inside, I will cover it so it is not visible that there is a door.
In addition to the above-described insulation/wall, I planned to build in the door opening:
1. 45 x 45 wooden studs with fiberglass wool in between.
2. Plasterboard the size of the door opening between the wooden studs/insulation and the door.
3. Plasterboard the size of the door opening between the door's insulation and the wall's insulation.
Does this work? Can I remove one of the plasterboards? If so, which one? And instead have an air gap?
Does it not work? The frame will only be covered with one layer of plasterboard.
Clarification, from inside out the wall for the door opening will contain:
plasterboard 13 mm
plywood 12 mm
wooden studs and fiberglass wool
plasterboard 13 mm *
wooden studs and fiberglass wool
plasterboard 13 mm
door in some veneered chipboard material
* this is where I imagine there might be a problem. The plasterboard does not cover the frame, which is flammable. Maybe I have to make it large enough to cover the frame, place it directly against the wall, and extend the air gap between the wall and insulation/wooden studs (or make contact between the plasterboard and the wall's wooden studs, which would probably reduce sound insulation).
Is there any other material than plywood that is better without being expensive?
Is there a better way to do this?
