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To assess the quality of a job performed with dry construction, it is necessary to clarify the various regulations that regulate the sector.

By analyzing the components making up the plasterboard panels, according to the European Regulations, we find the following rules:

⁃ UNI EN 520 (plasterboard sheets): the standard indicates the qualities and requirements of gypsum sheets for use in buildings and for those intended for further processing.

⁃ UNI EN 14195 and UNI EN 13964 (metal profiles): the standard indicates dimensional characteristics and tolerances of the structure used to make plasterboard elements.

⁃ UNI EN 13950 (insulating couplings): in addition to the standard indicated, the CE marking is also required for this category of products.

⁃ UNI 11424: 2015 (installation): the standard indicates the criteria and rules in relation to partitions, wall cladding and false ceilings in residential and non-residential buildings; walls and wall coverings with full-height warping.

⁃ UNI EN 13964 (Suspended ceilings - Requirements and test methods): the standard provides information for the various parts of the false ceiling (suspension system, load-bearing structure and finish) and for those responsible for the design, manufacture and selection of suspended ceilings used within buildings or civil engineering works.

⁃ UNI EN 14566 (Mechanical connecting elements for gypsum board systems): The standard refers to the characteristics and performances that must be met by the mechanical fastening and connecting elements for gypsum board systems (tear resistance, mechanical resistance) bending, penetration of metal elements, diameter and technical measures of the individual parts of the fastening element).

D. M. 14/01/2008 and NTC

Although they do not have structural functions, some interventions made with plasterboard (walls, counter-walls, false ceilings and external curtain walls), in the event of deterioration and subsequent collapse, are a danger to human health.

This is why the D.M. 14/01/2008 on the "Technical Standards for Construction" provides that the structural calculation of these elements is aimed at the stresses due to the weight of the same and external stress resulting from wind or seismic movements and is checked for limit states to limit the damage thus maintaining the safety of users.

In reference to a possible collapse, the buildings are divided into four classes of use:

• Class I: Buildings with only occasional presence of people, agricultural buildings;

• Class II: Buildings the use of which foresees normal crowding, without dangerous contents for the environment and without essential public and social functions, Industries with activities not dangerous for the environment;

• Class III: Buildings the use of which includes significant crowding, Industries with activities dangerous to the environment;

• Class IV: Buildings with important public or strategic functions, also with reference to the management of civil protection in the event of a disaster, Industries with activities that are particularly dangerous for the environment.

All the items making up the system in question must comply with the European standards described above.

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