The building is characterised by bio-based construction criteria, it has mechanical ventilation with heat recovery, and it has achieved an impressive blower door test of n50 = 0.27.

Thermal envelope

Exterior wall: Wood fibre insulation 240mm with CLT panels
U-value = 0.171 W/(m²K)

Basement floor/floor slab: XPS 200m below the concrete slab
U-value = 0.162 W/(m²K)

Roof: Wood fibre insulation 234mm with CLT panels
U-value = 0.148 W/(m²K)

Frame: Irribarren IR-90-102, Timber frame
U _w-value = 0.94 W/(m²K)

Glazing: Triple glazing 4/18/4/18/4
U _g-value = 0.54 W/(m²K)
g -value = 55 %

Mechanical systems

Heating installation: air source heat pump with underfloor heating

Domestic hot water: air source heat pump with 177 storage tank

PHPP values

Annual heating demand: 13 kWh /(m²a ) calculated according to PHPP

PE demand (non-renewable Primary Energy): 96 kWh /(m²a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP

PER demand (renewable Primary Energy): 44 kWh /(m²a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP