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Renovation of a property


Location: Garbagna (AL)

Client: Private

Job: Refurbishment of a building in Garbagna (AL)

Date: 2014

Amount of work: 131.390 €

Project: Final and executive project supervision of works,

safety by Arch. P. Bandini

Safety coordination: Arch .Alessio Costanzo​ 

Contractor: /

Category (table z-1): E-20


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The work in question consists of the redevelopment with change of use of a property located in the Municipality of Garbagna in the province of Alessandria. The housing unit is completely exposed to the south as regards the view of the premises, while the part of the intervention intended for distribution and service spaces is located in an area built against the ground. This made it very necessary to intervene with thermal insulation works both at the flooring level (walking surface raised by about 40 cm for crawl space construction) and masonry (construction of ventilated cavity on the back wall and external coat). Two bedrooms will be created, two toilets plus a service one, a laundry room, a dining room with kitchenette, a living room plus a garage and a technical room connected to the house. The connection with the property units above is maintained, as the entire property belongs to the same family.

Area of ​​the area: 3867 square meters. | Total built area: 233 sqm. Total built volume: 839 m3 | Maximum height: 3.60 mt. | Cost: € 95,000. | Hypothetical Energy Class: A +



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Energy requalification

The intervention illustrated here is the result of a careful choice of systems - which combined with an accurate architectural study of the building materials, aim to bring the building to high energy efficiency values. - In fact, thanks to the high degree of insulation of the structures and fixed structures, an adequate orientation of the premises and the use of solar greenhouses, it is possible to use low-power heat generators. In this sense, an external coat covering was opted for on the entire vertical external surface of the building, through the use of insulating panels which are then covered by a protective and finishing layer made with special plasters. - This is a relatively new insulation system, the advantages of which are: elimination of thermal bridges; protection of structures from thermal changes; exploitation of the building's thermal inertia. enhancement of the buildings greater durability of the facades decrease in fuel consumption increase in comfort limitation of the risk of condensation and mold formation no reduction in the internal living area The system for the production of domestic hot water will be centralized, powered by a condensation connected to a field of thermal solar panels of the "vacuum" type and therefore with a good solar capture yield even during the winter period; they will be installed on the roof and sized to meet at least 69% of the annual energy requirement for the production of domestic hot water (with 100% coverage for the months from May to September). It should also be noted that the solar system will be of the water type without antifreeze and this allows to avoid routine maintenance interventions to a minimum. Photovoltaic panels carry out a short cycle in the production of energy as as soon as they are hit by the sun's rays they generate electricity that can be used immediately. In practice, the use of photovoltaic panels allows you to produce energy where it is needed. The building will be equipped with a 19.2 kWp Grid-connected photovoltaic system integrated into the roof. It will be connected to the normal condominium electricity network with the - on-site exchange system; this system makes it possible to request electricity in case of need or to transfer it to the grid itself if it is not consumed. Each room will be equipped with a room thermostat, connected directly to the home automation system of the apartment, and able to manage the various circuits of the rooms themselves in order to regulate the energy intake according to the different conditions (e.g. free contributions of heat due to solar radiation, presence of people, electrical appliances, etc.).


In defining this project, a new approach to plant choice and planning was used. Sustainability is not an added value, but it becomes the foundation of the whole project. From the production of energy from solar sources to the design of home automation systems, all areas have been designed according to a logic consistent with the needs of a world increasingly poor in resources, where energy saving, attention to environment and efficient use of energy are issues that have long been held to be important but have been implemented very slowly in the past. The use of BACS systems (Building automation control system) is envisaged in the building, also called devices for the control and management of buildings, which concretely allow to improve the energy efficiency of the building systems, in relation to the external environmental conditions and to the different and variable scenarios of use and occupation of the individual rooms of the building itself, while providing the highest levels of comfort, safety and quality. The simple possibility of automatically adjusting the lighting or thermoregulation system, based on the actual presence, or absence, of people in a residential context results in concrete reductions in energy consumption. The goal to be pursued is to create a simple system but capable of automating repetitive functions, improving comfort but above all achieving energy savings that, based on the expected level of automation, also reach values ​​equal to 30% compared to a traditional system. FUNCTIONAL CHARACTERISTICS OF THE HOME AUTOMATION SYSTEM Heating / Cooling Automatic and optimized adjustment of the heating according to the actual use of the rooms and the needs of those who occupy them. Ventilation The ventilation and air exchange system can be activated with a button as needed. Ventilation can be activated in the presence of people. Solar Greenhouse Shading Control of awnings and rolling shutters based on the command of a button and according to an hourly schedule; via wind, brightness and rain sensors. Lighting Centralized control of lighting in the home and in the garden. Recall of lighting scenarios or individual adjustment of light intensity. Safety Signaling of opening windows or doors or glass breaking, intrusion, presence of smoke, etc. possibly also by telephone or via the internet; Video surveillance of the entrance door, Video intercom. Emergencies Reporting of an intrusion by turning on all lights for deterrent purposes (panic command).


Daily life Scenarios of daily time control of lighting, heating, ventilation, shutters, etc. Automation Automatic reset of switches in case of electrical disturbance, warning of faults and reporting to the service center. Visualization Visualization and control of all systems in the house via a touch screen display Clear representation. Connection to surveillance cameras The radiant floor heating system consists in passing a hot fluid through a coil located under the floor so that it heats up and then releases heat to the environment (radiated heat). Advantages Costs. Radiant floor heating allows for considerable energy savings because: the system is operated with a low water temperature; the predominantly radiant operation (and therefore minimally convective) means that the Thermal Comfort can be guaranteed with an air temperature of even only 18 ° C (compared to 20 ° C, it leads to energy savings of 10-14%). The radiant floor, compared to conventional radiator systems, allows to obtain a considerable reduction in consumption; Given the low operating temperature, the system is ideally applied in combination with: - condensing boilers (characterized by very high efficiency) - to which underfloor heating allows for a drastic reduction in intermittent operation. The heat generator will therefore work in conditions of maximum efficiency; - thermal solar panels thanks to which you can heat the water to the operating temperature of the system or in any case get very close to it (making only a slight increase in temperature by the heat generator necessary); plant systems equipped with thermal storage powered by biomass heat generators. Comfort and Health. The distinctly radiant behavior of underfloor heating entails numerous advantages, including (to a lesser extent than the radiant wall): drastic reduction in the movement of dust (linked to the convective component); elimination of the problem of dust combustion (the floor will have a maximum surface temperature of 29 ° C except for the perimeter areas where it can reach 35 ° C, however largely insufficient for dust combustion); greater thermal comfort deriving from the minimal presence of the - convective component (movement of hot air in the breathing area and cold air at the level of the feet) and, on the opposite side, from the predominantly radiant behavior (pleasant heat similar to that of the sun or fire) .

Extra. In addition to energy savings and comfort and health, this solution offers other additional advantages:

- underfloor heating solves the problem of unsightly conventional radiators and offers full freedom of positioning - the furniture in any room of the house;

- the system can also be used for summer cooling (in this case, a refrigerated fluid must pass through the coil, preferably in combination with air dehumidification systems). In this case, an air conditioning system is obtained without the numerous contraindications of conventional cooling systems.

- Lower overall maintenance costs of the property (interior painting)


- Higher construction cost compared to traditional heating systems sized according to regulations (ie not "oversized") + 10%. The investment can still be amortized over a limited number of years;

- the system, providing for the heating of the screed below the floor, is rather slow in bringing the environment to temperature. This makes it unsuitable for occasional use (second home). Some expedients in the design phase make it possible to face the "slowness" of this system with great success, making it perfectly suitable for residential use even if the house is not used for a considerable number of hours during the day (eg absence due to school or work).


The solution with floor panels represents, in buildings characterized by standard thermal insulation, an effective way to obtain an effective and economical radiant heating system at a good price. The radiant floor, compared to conventional radiator systems, allows to obtain a considerable reduction in consumption; reduction that can become drastic with the use of condensing boilers, solar panels, biomass heat generators or photovoltaic-powered heat pumps. Underfloor heating, like any truly radiant system, also guarantees high levels of thermal comfort, as well as a drastic reduction in the problem of dust.