Burgos, Spain – Spain’s first retrofit Passive House has been completed by a team at the University of Burgos in the north of Spain.
The stone building was given a PU spray foam lining to help it conform to internationally-recognised German EnerPhit Passive House standard. The standard is evidence of quality assurance verification the building offers a specific energy value.
Prof Manuel Manso, who is also the university’s vice dean, said the team chose polyurethane because of its potential for adhesion to the stonework of the building.
“It is the easiest kind of material to stick to the stone wall,” he said.
The rigid foam thickness measured up to 15cm at some points "in order to be able to make the building isolated for the certification."
The building's windows are not opened, with outside air filtered and heated through an air system, according to Manso.