Technical report in accordance with Law 10: What it is, when it is mandatory and how to draft it

Technical report in accordance with Law 10: What it is, when it is mandatory and how to draft it

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The old Law 10 issued in 1991 and known as Technical or Energy Report, is a document that has become mandatory in the case of new constructions or renovations of buildings, installation of technologically advanced air conditioning systems (heating with heat pump and condensation) and by structural changes of a building (volumetric expansion).

What is the Technical Report in accordance with Law 10

The technical relationship also known by the term ex Law 10 is a document that must be prepared and signed by a designer for a new building or for renovations, volumetric changes and interventions aimed at improving thermal comfort in a residential environment.

By designer we mean an engineer, an architect, a surveyor or a construction expert qualified for this type of activity.

For the first time the technical report was introduced in Italy, precisely, with the old Law 10 in 1991 while with Legislative Decree 192 of 2005, this document was updated.

In the Technical Report, the designer introduces a series of data that refer to the intervention to be carried out and concern the constructive characteristics of the building or systems according to the cases. In practice, the designer inserts values ​​that will then have to be respected by the company in charge of implementing the intervention.

The data refer to requirements regarding the containment of energy consumption. A certificate must also be attached to the document with checks proving that the indicated requirements have been met.

In summary, the paper collects specific data and information on the performance and energy performance of a building and related systems that are used to regulate temperatures at all times of the year. Among other things, the legislation provides that the person in charge of the work, ie the person in charge of the work, must keep a copy of the technical report on the work in paper and digital format so that, in inspection case, be displayed on time.

If this does not happen, sanctions are foreseen. Likewise, at the end of the intervention, the site manager must also evaluate what has been achieved and issue a document accrediting the conformity of the works in accordance with what is indicated in the technical report.

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In which cases the technical report is mandatory in accordance with Law 10

Current legislation provides that the technical report is mandatory for all interventions involving the construction of the building or an intervention on the surrounding-plant system to improve energy characteristics.

Wanting to summarize and simplify, it is essential to know that any intervention aimed at modifying the energy performance and therefore the thermal comfort of a home, requires the preparation of the Technical Report.

The technician will be responsible for identifying the requirements to be verified that depend on the object of the intervention and, therefore, could also affect only the heating installation or the entire building. Consequently, the checks that must be carried out at the end of the works will affect a single floor or the entire structure of the building. The issue of controls is quite complex because the legislation provides for four levels depending on the type of work to be carried out.

Level 1 verification: new buildings

The minimum requirements for this first case are reported in Annex No. 1 Art, 1.3 of the Ministerial Decree of June 26, 2015. The series includes all newly built buildings and those that are subject to demolition and construction.

The legislation in the latter situation does not distinguish between the case of intervention for which it was required to obtain the classic works license from the territorially competent municipal administration or the SCIA.

Another case in which the first level of verification is required is that of volumetric increases greater than 15% of the volume which previously had air conditioning. The legislation also clarifies that volumetric extensions that, regardless of the percentage, are absolutely greater than 500 cubic meters fall within the first level of control.

The law also provides complete information on the concept of volumetric expansion with new technical systems and on calculation methods. In particular, all volumes that already existed but did not have air conditioning or the volumes present in the rooms that have changed use are calculated with the obligation to have in any case a technical system.

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Level 2 verification: first level restructuring

The normative reference is annex n ° 1 art. 1.4. of the Ministerial Decree of June 26, 2015. In particular, the level 2 controls they must be carried out when situations concerning the so-called major first-level restructuring occur at the same time. That is, the intervention must be of interest at least 50% of the total gross dispersion area of ​​the building.

It should be noted that by gross scattering surface of a building, we mean the arithmetic sum of all surfaces of individual floors included within the internal perimeter measured gross walls and other vertical elements including the elevator shaft.

In addition to the intervention and the incidence of more than 50% of the total gross dispersion area, it is also necessary to carry out the restructuring of the heating system useful for air conditioning at all times of the year. Legislation and the various bodies dealing with relations with professionals and building owners have made it clear that the reform should be of concern, in case of condominiumall systems and not just a single apartment.

Level 3 audits: major second-level restructuring

Instead, level 3 of controls is foreseen for the same type of interventions indicated in level 2 but with the difference that the restructuring must be done with aincidence greater than 25% of the total dispersion gross area. Among other things, with respect to the previous case, the restructuring of the system may also be unforeseen so it is not required that the two interventions have to be done simultaneously. The checks, as in any other case, will be carried out only on the works actually carried out.

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Level 4 of verifications: energy requalifications

The characteristics of level 4 of verifications are reported in Annex 1 art. 1.4.2. of the Ministerial Decree of June 26, 2015. In this case we are talking about energy requalification with special reference to the works relating to the maximum 25% of the gross dispersion surface of the building.

Alternatively, the work may refer to a new installation of a thermal system subordinated to the building or to partial interventions such as the replacement of a condensing boiler heat pump, stoves, etc. The checks will be carried out on one of the two interventions just indicated on the envelope with a maximum surface area equal to 25% of the dispersant or on the renovation and installation from scratch of air conditioning systems or part of them. .

How to prepare the Technical Report

Every qualified technician, such as an engineer or an architect, must know how to write the Technical Report. It should be borne in mind that this document was introduced in Italy with the aim of regulating the use of energy for heating.

In order to better meet the provisions of the legislation, it is necessary to develop the document following three fundamental aspects. In particular, care must be taken to place the intervention to be planned in the exact scope of legislative application. The designer, referring to the ministerial decree of June 26, 2015, must understand and highlight precisely the description of the interventions to be carried out. In addition, for a correct wording it is also essential to know precisely the checks required at the legislative level.

The technician in charge of this must present in an adequate and clear way the results obtained from his calculations, highlight the methods of development of the calculations and therefore the adjuncts that must be included in the project and that explain the reason for certain elections. . In addition, as a third aspect, the responsible technician must know any extension of the law in the form of exceptions, deductions, exclusions, deductions, etc.

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Exceptions to the drafting of the Technical Report

In the annex n ° 1 art. 1.4.3. also of the Ministerial Decree of 26 June 2015, the cases for which exceptions are provided for in the drafting of the Technical Report. In particular, interventions carried out in the surrounding area of ​​the building that involve only the finishing layers both inside and outside are excluded from the obligation to apply the minimum energy efficiency requirements. outdoor.

Therefore, these are parts that do not affect thermal feedback.

The legislation also expands the scenario by highlighting non-mandatory application even in case of renewal of portions of plaster provided that the affected surface is less than 10% of the total dispersion gross area.

The second case for which there is an exception to the drafting of the energy report in accordance with Law 10 is that of ordinary maintenance interventions that are carried out in existing systems and that allow temperatures to be regulated.

The third exception, on the other hand, concerns the replacement of the heat generator for which the different devices with well-defined technical requirements. In particular, the repeal is envisaged for heat generators with a rated power of less than 50 kW. To give a fairly common example, it is not necessary to prepare the technical report if an old traditional boiler is replaced by a condensing one that guarantees higher efficiency standards.

In addition, there are two even more specific cases, specifically when the energy reclassification of the opaque wrapper is performed, which involves thermal insulation from the inside or the cavity.

Author: Andrea Dicanto

Author Andrea Dicanto
Passionate designer expert in the field ofBuildings, Construction and Furniture. Since I was a child I have always studied and analyzed problems ranging from questions static of buildings and constructions to the best way of design and equip interior spaceswith a nod to new technologies especially in the field seismic.

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