Casa SG Magi: a deep energy retrofit in Sitges
Casa SG Magi: a deep energy retrofit in Sitges Casa SG Magi is an exemplary model of comprehensive energy renovation in Sitges, showcasing a strong commitment to sustainability and energy efficiency. Designed by Sergi Gargallo from SGArq Passivhaus Architecture, and certified by Oliver Style from Praxis Resilient Buildings, this single-family home, originally built in 1953, …
Casa SG Magi: a deep energy retrofit in Sitges
Casa SG Magi is an exemplary model of comprehensive energy renovation in Sitges, showcasing a strong commitment to sustainability and energy efficiency.
Designed by Sergi Gargallo from SGArq Passivhaus Architecture, and certified by Oliver Style from Praxis Resilient Buildings, this single-family home, originally built in 1953, has achieved the EnerPHit Plus certification. This recognition is a significant achievement, as it reduces the home’s energy consumption by 90%, turning it into a comfortable and efficient living space.
Thermal envelope
The house is spread over two floors, with a useful floor area of 82 m². Casa SG Magi has undergone drastic surgery to maximize its energy efficiency. The external walls are fitted with an external thermal insulation system (ETICS) made of 120 mm of EPS, which eliminates thermal bridges and significantly reduces heat loss in the winter and heat gains in the summer. The roof is insulated with 200 mm of XPS insulation, while the floor slab has 10 cm of insulation, ensuring optimal thermal comfort. Unwanted air infiltration has been reduced to an extremely low level: n50 = 0.69 air changes per hour (ACH), compared to an existing home, which typically has an infiltration level of around n50 = 10 ACH.
High-Performance Windows
The windows of the house are another crucial aspect of its efficient design. The PVC WERU Afino One frames, certified as Passivhaus components, along with triple-glazed low-emissivity windows filled with argon gas, provide exceptional insulation. These features not only enhance energy efficiency but also increase interior comfort by reducing heat loss in winter and minimizing excessive heating in summer.
Mechanical Ventilation
To ensure optimal indoor air quality and prevent construction-related issues, Casa SG Magi is equipped with a Zehnder Comfoair Flex 250 sensible heat recovery unit. This controlled mechanical ventilation system removes odours and humidity, keeping the indoor air fresh and healthy.
Climate Control System
The home’s climate control is handled by an air-based system, consisting of two Panasonic CU-Z25UBEA air-to-air heat pumps, one on each floor, providing both heating and cooling. With a capacity of 2.5 kW for cooling and 3.2 kW for heating, these units ensure a comfortable environment year-round with minimal energy consumption.
Renewable Energy
One of the most impressive aspects of Casa SG Magi is its capacity to generate renewable energy. With the installation of 9 photovoltaic panels of 455 Wp, the house typically produces 32% more energy than it consumes. This not only makes it a self-sufficient home but also a small renewable energy generation center.
Casa SG Magi is an outstanding example of how energy renovation can transform a conventional house into a high-performance, energy-efficient home. Thanks to the vision of Sergi Gargallo and the certification by Oliver Style, this house in Sitges not only drastically reduces its energy consumption but also offers a healthy and comfortable indoor environment, contributing to the well-being of its occupants and the environment.
Photos: Juan Giribet de Sebastián
