Client:
Sven Reuter
back to list
Am Soltekampe, Hannover
Description
Before the modernization
A house of their own, but still close to the city: like many families, Sven Reuter and his wife Sabine dreamed of having such a place for themselves and their two children. And they wanted their home to be a Passivhaus, for the Hannover architect knew the unbeatable advantages they provide. "We wanted to build in an energy-saving way and to be able to do as much of our day-to-day traveling as possible by bicycle. Since there were no suitable plots of land available, we decided to look for an existing house that we could do something with," explains Sven Reuter. In 2009, they found what they were looking for in Hannover-Badenstedt. The endterrace house with southern gable was in nearly the same condition as it had been the year it was built. "The most modern thing in it was the gas heater from 1994," remembers Reuter.
The modernization
A wide variety of insulation and building technology concepts were played out in simulations in order to achieve minimal heating and residual energy needs at affordable construction costs. After the successful modernization in which the roof was built out, additional bathrooms were created, and walls were knocked out to create a generous amount of living space the values calculated in the simulation were compared to the actual results, in order to gain knowledge for future projects. The result: the old end-terrace house was transformed into a Passivhaus and now provides top-quality housing.
Parties involved
Design:
Building data
Building type:
End-terrace house
Location:
Hanover
Year of construction:
1964
Modernization:
2009
Residential units:
1
Heated usable space:
157 m²
Subsidies:
KfW, proKlima
Initial condition
Exterior Walls:
solide masonry, HTC ? 1.6 W/(m²K)
Windows:
Windows with heat-insulating double glazing; HTC=2.5 W/(m²K)
Roof:
Rafter roof with 10 cm insulation
Basement ceiling:
Concrete slab over unusable crawl space, with floating floor screed atop 3 cm footfall sound insulation; HTC?1.0 W/(m²K)
Ventilation:
Ventilation through windows as well as through joints and cracks typically found in old buildings
Heating:
16-year-old condensing gas boiler
Modernization in detail
Exterior walls:
30 cm polystyrene composite thermal insulation system; quality: 0.032 W/(mK); HTC=0.10 W/(m²K)
Windows:
New synthetic-profile Passivhaus windows with heat-insulating triple glazing and stainless-steel glass spacers; HTC=0.8 W/(m²K)
Roof:
New roofing; insulation between and atop the roof rafters; HTC=0.08 W/(m²K)
Basement ceiling:
New dry-screed floor construction over 6 cm insulation; quality: 0.024 W/(mK); HTC=0.37 W/(m²K)
Ventilation:
Comfort-ventilation system is integrated into compact ventilation device
Heating:
Compact ventilation device with integrated passive heat conductor; minimum-sized heat pump and 180-liter storage unit
Air conditioning:
no active air conditioning system
Measured values
AIRTIGHTNESS:
n50= 0.57 h-1
Calculated values
Calculation method: Passivhaus planning package; Initial values: Hannover building typology
HEATING ENERGY NEEDS:
BEFORE
150 kWh/(m²a)
AFTER
14 kWh/(m²a)
SAVINGS
91 %
TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
Electricity
19 kWh/(m²a)
Gas
225 kWh/(m²a)
AFTER
Electricity
43 kWh/(m²a)
PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
301 kWh/(m²a)
AFTER
111 kWh/(m²a)
SAVINGS
63 %
CO2-EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
67 kg/(m²a)
AFTER
27 kg/(m²a)
SAVINGS
60 %
