Most sealants can function as acoustic seals in practice, as they fill in cracks and cavities between building elements. They thus reduce airborne sounds in particular (that can pass between separate rooms) and to some degree also footfall sound (transported through floors).
The Danish Building Rules can apply a range of requirements to acoustic insulation of a building. They will often depend on which construction is to be acoustically insulated. There is often a difference between facade sealants and those used on stud walls.
The ideal seal width is 10-12 mm, but it should never be narrower than 6 mm or wider than 20 mm. Very narrow seals should be avoided for technical reasons, whilst wide ones will never insulate against sound satisfactorily.
A soundproof wall can consist of two separate layers of plasterboard. Seals are grouted on the inner layer using Acrylfugemasse 557, Mester Akryl 502 or Danaseal Acryl 504.
Acoustic insulation is performed best along ceilings when the inner plasterboard sheet is in contact with the ceiling, whilst the outer sheet is suspended 10-12 mm to make room for an acoustic seal, e.g. using Acrylfugemasse 557, Mester Akryl 502 or Danaseal Acryl 504.
Seals around doors should be acoustically insulated using a double seal of compressed mineral wool, a backstop and sealant compound such as Acrylfugemasse 557, Mester Akryl 502 or Danaseal Acryl 504.
If a more elastic product is required that is better able to resist movement in a construction, Interiørfuge 521 or Sealflex Hybrid 522 should be used.