Two questions regarding construction

[Baskavoda]

Question 1:
I am in the process of building an addition to my existing house. It will include a basement section that will be used as a rental apartment. Above it, we will have our kitchen. The contractor has specified a 220mm floor structure with 45mm of mineral wool insulation. I think it sounds insufficient and want the best possible sound insulation. Should I fully insulate with 220mm mineral wool or stone wool? What else should I do? Should I install a suspended ceiling with acoustic profiles in the apartment, or are there other effective methods without losing too much ceiling height?

The contractor has placed the sill on the basement walls according to the drawings, but it seems the basement walls are not perfectly straight or have ended up too low, as the floor structure is propped up by about 5-10mm around the entire construction. Is it acceptable to do this, or does the floor structure need to be in direct contact with the sill?

 

[HRico]

Regarding sound

Question 1:
Currently adding an extension to the existing house. It will be a basement section used as a rental apartment. Above it will be our kitchen. The contractor has specified a 220mm floor structure with 45mm mineral wool insulation. It seems insufficient to me, and I want the best possible soundproofing. Should I fully insulate with 220mm mineral wool, or stone wool? What else should I do? Hang a suspended ceiling with acoustic profiles in the apartment, or are there other effective methods without losing too much ceiling height?

The contractor has placed the sill on the basement walls according to the drawing, but it seems the basement walls are not 100% straight or have been positioned too low, as they have braced the floor structure about 5-10mm around the entire construction. Is that acceptable, or does the floor structure need to be tightly against the sill?

Regarding sound, it definitely feels inadequate. For both your and the tenant's sake, you want high sound insulation. For the tenant, you also want low impact sound levels.
I recommend checking floor structure setups from a drywall manufacturer that has good solutions. For example, type 6 in this pdf:
https://www.gyproc.se/sites/mac3.gy...F48A54D239BFAAA7DCE23387C/HB10_BJLKLAG-TR.pdf

 

[Baskavoda]

Regarding sound

regarding sound, it really feels weak. For both your and the tenant's sake, you want high sound insulation. For the tenant, you also want a low impact sound level.
I recommend that you look at floor structure from a gypsum manufacturer that has good solutions. For example, type 6 in this pdf:
[link]

Yes, acoustical profile seems to be a reasonable solution, along with fully insulated flooring. Not cheap though.

 

[Plupp 405730]

Question 1:
I'm building an extension to an existing house. It will have a basement section to be used as a rental apartment. Above it, we will have our kitchen. The constructor has prescribed a 220mm joist with 45mm mineral wool insulation. I think that sounds minimal and want it to have the best possible soundproofing. Should I fully insulate with 220mm mineral wool, or stone wool? What more should I do? Suspend a drop ceiling with acoustic profiles in the apartment, or are there other effective methods without losing too much ceiling height?

The contractor has placed a sill on the basement walls according to the drawing, but it seems like the basement walls are not 100% straight or ended up too low since the joists have been propped up about 5-10mm around the entire construction. Is it okay to do this, or do the joists need to rest firmly against the sill?

Another question—does the construction meet fire safety requirements since it is classified as a multi-family dwelling?

 

[Baskavoda]

The classification is still a single-family house

 

[Plupp 405730]

The classification is still a single-family house

But if you rent it out, you need to consider the fire requirements; it can become expensive and tragic in case of a fire...

 

[Baskavoda]

There is a door between the rental part and the rest of the dwelling. This means it is classified as having a lodger, which sets lower requirements.

 

[Plupp 405730]

There is a door between the rental part and the rest of the residence. This means it is classified as having a lodger, which has lower requirements.

Ok as long as you are satisfied with it, that is good.

 

[Baskavoda]

If all homeowners who rent out parts of their homes had to take into account requirements for noise, fire, accessibility, daylight, etc., similar to new production, the housing shortage in major cities would increase even more, which is not needed. Thank you for your points.