The standard that classifies the acoustic quality of a dwelling into four classes (I to IV), combining insulation between units, facade, impact and systems noise. It is voluntary and adds to the binding minimum requirements of D.P.C.M. 5/12/1997, certifying a graded quality verified on the finished building. Protected technical standard: its logic is described.
It applies to the voluntary acoustic classification of residential and similar dwellings. It is read together with D.P.C.M. 5/12/1997 (binding minimum requirements) and Law 447/1995 (framework): the class is an additional quality, verified by measurements on the finished building.
It defines a method to classify the acoustic quality of a dwelling into four classes (from I, the best, to IV), based on a few measured or calculated descriptors — airborne sound insulation between units, facade insulation, impact sound, systems noise — combined into an overall class. It is voluntary and adds to the legal minimum requirements: it certifies a graded quality, not just compliance.
As with energy, noise too has a class. UNI 11367 defines the acoustic class of a dwelling, from I (the best) to IV, assessing how well the home is protected from sound. It is a voluntary tool, but increasingly demanded by the market: it turns acoustic comfort, usually invisible, into a label.
The class arises from combining a few aspects of sound insulation: between different units (airborne noise), from outside (facade), from footsteps and impacts (impact noise), and from systems (continuous or intermittent operation). None prevails: a good facade does not offset a noisy floor.
Here is the point not to confuse. D.P.C.M. 5/12/1997 sets the binding minimum acoustic requirements: the floor below which you cannot go. UNI 11367 is voluntary and classifies quality above that minimum. A home may comply with the law yet fall in a modest class: 'compliant' and 'class I' are not synonyms.
The class is not certified on paper alone: it is verified by measurements on the finished building. It is the moment of truth, because between the acoustic design and the site hides the workmanship: a poorly executed detail — a joint, a service penetration — can drop the class. Acoustic quality is, more than others, a matter of execution.
UNI 11367 gives acoustic comfort a language: it makes it declarable, comparable, marketable. For premium architecture it is the proof that silence was not left to chance but designed and measured — a value perceived every day, which the market is beginning to reward.
An acoustic-quality rating (from I, the best, to IV) defined by UNI 11367, combining insulation between units, facade, impact and systems noise.
No, it is voluntary; what is mandatory are the minimum acoustic requirements of D.P.C.M. 5/12/1997. The class certifies a higher, graded quality.
Not necessarily: compliance with the legal minimum does not coincide with the best class. One can be compliant and in an intermediate class.
By combining the dwelling's acoustic descriptors, verified by measurements on the finished building.
Because a poorly executed detail (a joint, a service penetration) can lower the class: acoustics depends greatly on execution.