State of repair
Aim of retrofit
Giulia Tissi, Federico Fioretta, Benedetta Tissi, Antonia de Besi, Alberta de Besi, Antonio Gallo, Matilde de Besi e Antonio Tissi .
Via Scapacchiò est n. 5, Saccolongo.
Laboratorio di Architettura Ecologica, Padova, Italy
In Enrico Pedretti Steping
VIA ARE 9, PESCANTINA (VR)
Ing. Stefano Dibiasi
Via Sabbadin 19, 35010, Limena (PD)
Hygrothermal assessment Ediclclima
brick masonry wall
The entire top-floor envelope was internally insulated with a coat of mineral insulating panels based on calcium silicate hydrates.
Application of a reversible insulation layer in the internal surface of the walls and new finishing
timber frame and double glazing dating around 1970
The new windows have similar shape and materials to the existing frames (timber). The frames are in lamellar larch wood and the double low emissive glass (3 + 3) has argon gas in the air gap.
The new windows, recurring to traditional materials (wood) have a better performance; their replacement is approved by the protection bodies because existing windows the existing windows had already been replaced around the 1970s and therefore did not constitute elements of historical and architectural character to be protected. The choice was to keep a frame made of traditional, natural material (wood) with better energy performance (it was not a question of preserving seventeenth-century frames). In this case it was not the material degradation that justified the replacement of the elements but rather the low historical value combined with poor environmental performance.
The roof insulation work was preceded by a careful analysis of the healthiness of the primary and secondary wooden structure, especially with regard to the main beam heads. Although they appeared to be healthy and intact, the internal analysis revealed that the upper part of the beams in contact with the tiles was damaged and suffering. The consolidation of the beam heads took place by inserting steel blades into the deteriorated portion and, in some cases, by adding concrete to the parts of the beams that had been cleaned from the deteriorated portions. Once the structure had been restored, the roof was insulated. Here, the need to combine summer comfort, using a material of sufficient thickness and low thermal conductivity, with the safeguarding of the aesthetic prerogatives of the façade and its elements, led us to withdraw the wood fibre insulation package and replace it, near the cornice, with light, thinner insulation.
The soluton was compatible because of the nature of insulation material (fibre wod) and not alteration of the external shape, even conservation of old tiles
The consolidation of the roof, prior to all others, was carried out by means of: - the installation in the attic of new planking screwed and glued to the existing one; - the connection between the new planking and the wall structures using bolted metal plates; - the installation of new metal tie-rods in a raised position with respect to the original; - the application, on the internal side of the vertical walls of the attic, of reinforced structural plaster based on hydraulic lime with suitable connectors.
From the intersection between the differentiated use of the three floors of the villa, the problems encountered and the constraints imposed by the Superintendence, an articulated project of restoration, static restoration and plant and energy requalification was born, which has been developed in different ways on the various levels.
DOMESTIC HOT WATER
As each floor of the villa is subject to different uses, comfort requirements and cost expectations were also different. On the ground floor, intended for occasional use, new radiators were simply installed in place of gas stoves, radiant terminals with better performance. These measures have increased efficiency with a considerable improvement in energy production and storage. On the second floor, where a family home was located, it was necessary to obtain a good level of air conditioning both in winter and summer. For this reason an autonomous thermal power station was installed with a hybrid system (boiler and heat pump) that produces both hot and cold water. To guarantee humidity levels compatible with summer air conditioning, a centralised controlled mechanical ventilation system with built-in dehumidifier was installed.
Conservation of all the significative materials and characters
Finally, to guarantee humidity levels compatible with summer air conditioning, a centralised controlled mechanical ventilation system with built-in dehumidifier was installed.
As already specified
On the second floor, where a family home was located, it was necessary to obtain a good level of air conditioning both in winter and summer. For this reason, an autonomous heating plant was built with a hybrid system (boiler and heat pump) that produces both hot and cold water.
As altredy written
Linked to the new system
As written for all other interventions
Voluntary certificates: No
Primary Energy 361,88 kWh/m2.y
Consumption_estimation_Before: 338 kWh/m2.y
Consumption_estimation_After: 319 kWh/m2.y
Consumption_estimation_Calculation_method: Steady state simulation (e.g. EPC, PHPP)
Consumption_estimation_After: 361,88 kWh/m2.y
On the first floor, with very significant inter-floor heights (up to 4.50 metres), winter air conditioning with low temperature terminals (radiant wall panels) to lower consumption at the same time achieve greater indoor comfort thanks to the radiant effect of the panels, which work by radiating their heat right at the right at the human body.