Energy retrofit of a apartment house in the center of the city, builded in the beginning of the 20th, carried out in 2 phases: EnerPHit-Step by Step. In Phase 1, 2 apartments were totally refurbished, both the thermal envelope and the active system of climate conditioning. The facades of the building are cataloged, so all the interventions have been carried out inside the envelope, respecting the classicist aesthetics of the original building.

THERMAL ENVELOPE

Exterior wall INT:

• Plasterboard 13mm
• Plasterboard 15mm
• Mineral Wool 80mm
• Existing Stone Wall 600mmEXT
• U-value = 0.347 W/(m2K)

Basement floor / floor slab INT:

• Wood 14mm
• Cement screed 40mm
• XPS 80mm
• Existing Wood 30mm
• Air Layer 390mm
• Muneral Wool 160mm
• Plasterboard 13mm
• EXT
• U-value = 0.116 W/(m2K)

Roof EXT:

• Ceramic Layer 30mm
• Cement Screed 40mm
• XPS 100mm
• Cement Screed 50mm
• Wood 30mm
• Air Layer 190mm
• Mineral Wool 200mm
• Plasterboard 13mm
• INT
• U-value = 0.102 W/(m2K)

MECHANICAL SYSTEM

• Ventilation: SIBER, DF SKY 1
• Passivhaus Certified Ventilation unit in all the apartments.
• Heating installation: Individual gas boiler in all the apartments.
• Domestic hot water: Individual gas boiler in all the apartments.

PHPP VALUES

• Air tightness n₅₀ = 1/h
• Annual heating demand: 13 kWh /(m2a ) calculated according to PHPP
• Heating load: 12 W/m2
• PE demand (non-renewable Primary Energy): 59 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.
• PER demand (renewable Primary Energy): 59 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.

Find more information here.