understanding-building-acoustics

Technical Booklet G of the Northern Irish Building Regulations

Technical Booklet G of the Northern Irish Building Regulations 2012 requires that all dwellings be designed and constructed in such a way that the transmission of both airborne and impact sound noise between separating walls and floors be limited to a level that will not threaten the health of the occupants or inconvenience them in the course of normal domestic activities.

Performance Standards

Tests of performance values of individual and 4 and 8 pairs of rooms.

Performance Standards

Table: Dwelling-houses and flats – performance standards for separating walls, separating floors, and stairs that have a separating function.

Airborne sound insulation DnT.w+Ctr dB (minimum values) Impact sound insulation L1nT.w dB (minimum values)
Purpose built rooms for residential purposes
Walls 45 62 
Floors and stairs 45  
Dwelling-houses and flats formed by material change of use
Walls 45 62
Floors and stairs 45  

 

Airborne sound – weighted standardised level difference (DnT,w)

Impact sound – weighted standardised sound pressure level (L'nT,w)

Acoustic Parameters

Performance values are given in terms of two acoustic parameters, one related to airborne sound, the other related to impact sound.

General Application

When determining how the guidance for resistance to transmission of sound applies to types of dwelling configurations, recognition should be given to the following:

Airborne Sound

  • Walls – a wall which separates a dwelling from another dwelling or from another building, or separates a habitable room within a dwelling from another part of the same building which is not used exclusively with the dwelling, shall have reasonable resistance to airborne sound.
  • Floors – a floor which separates a dwelling from another dwelling, or from another part of the same building which is not used exclusively with the dwelling, shall have reasonable resistance to airborne sound.

Impact Sound

  • Floors – a floor above a dwelling which separates it from another dwelling or from another part of the same building which is not used exclusively with the dwelling, shall have reasonable resistance to impact sound.

Both the above do not apply to a wall or floor which separates a dwelling from another part of the same building if such part is used only occasionally for the inspection, maintenance or repair of the building, or of its services, fixed plant or machinery.

All Monarfloor® products and systems comply with Part G (Sound) of the Northern Ireland Building Regulations.

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