Client:
Elisabeth Seiler and Udo Scherer
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Maschweg, Hemmingen
Description
The aims of the modernization were: seperation of both residential units and development to the road, open living, visible framework, maximal CO2- and energy-savings as well as highest indoor comfort based on valuable passiv house components. A large amount of personal contribution restricted costs, an additional roof insulation was not realisable for reason of budget. Therefore a improved airtightness could only be achieved on the ground floor and on the first floor with foil in the ceiling area.
After draining, sealing and insulating the fundament, hollowing ground and first floor, additional window areas and a balcony for the the leased out first floor flat were created. With a wooden supporting structure and blown in cellulose, the house was intense insulated from outside. From the first floor upwards, a larch wood cladding was mounted, the first floor was plastered. Furthermore, the historic framework is realised in the indoor areas. It was exposed, lavishly refurbished and the trays were fitted with humidity regulating clay plaster.
This modernized house consumes 75 percent less energy than before and uses natural gas as well as solar energy for water heating and space heating. Heating is performed by means of the ventilation system, individual single radiators and the temperated sandstone floor in the dining area.
Involved parties
Design:
partner und partner, christoph groos und ulrich müller
Building data
Building type:
Single-family-home
Location:
Hemmingen
Year of construction:
ca. 1850
Modernization:
2006 - 2010
Residential units:
2
Heated usable space:
254 m2
Subsidies:
KfW, BAFA, proKlima, city Hemmingen
Initial situation
EXTERIOR WALLS:
Ground floor: 30 cm solid brick walls First floor: view timber with brick infills
WINDOWS:
Windows with insulating glazing, HTC ? 2.7 W / (m² K)
ROOF:
Rafter roof with 16 cm mineral wool insulation between the rafters, HTC = 0.34 W / (m² K)
BASEMENT CEILING:
Concrete floor slab, some with floating floor, 2 cm insulation, some uninsulated
VENTILATION:
Window ventilation, as well as typical old building joints and cracks
HEATING:
23-year-old gas boiler
Modernization in detail
EXTERIOR WALLS:
new wood beam construction with 28-36 cm cellulose blow-in insulation, quality of 0.040 W / (mK), on the ground floor with plastered wood wool board, upstairs with 5 cm wood fiber softboard and larch cladding, HTC = 0.11-0.13 W / (m² K)
WINDOWS:
new window with 3-pane glazing in wooden frame made ??of Douglas fir and glass spacers made of plastic, HTC = 0.9 W / (m² K) roof
ROOF:
no changes
BASEMENT CEILING:
new floor constructions: Oak floors on 6 cm polystyrene insulation and sandstone floor to 3 cm polystyrene insulation, HTC = 0.46 to 0.57 W / (m² K)
VENTILATION:
Central comfort ventilation system with heat and humidity recovery
HEATING:
new central 950-liter buffer stoarge with integrated gas burner (condensing technology) combined with 13 m² flat plate collectors for solar space heating and water heating
AIR CONDITIONING:
no active air conditioning installed
Measured values
AIRTIGHTNESS:
n50 = 3 h-1
Calculated values
Calculation method: Passivhaus planning package; Initial values: Hannover building typology
HEATING ENERGY NEEDS:
BEFORE
220 kWh/(m²a)
AFTER
74 kWh/(m²a)
SAVINGS
66 %
TOTAL ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
Gas
403 kWh/(m²a)
Electricity
19 kWh/(m²a)
AFTER
Gas
84 kWh/(m²a)
Electricity
19 kWh/(m²a)
END ENERGY GENERATION:
PHOTOVOLTAIC INSTALLATION
Electricity
5.280 kWh/(m²a)
PRIMARY ENERGY NEEDS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
501 kWh/(m²a)
AFTER
89 kWh/(m²a)
SAVINGS
82 %
CO2-EMISSIONS FOR HEATING,AIR CONDITIONING,DHW,ELECTRICITY:
BEFORE
110 kg/(m²a)
AFTER
19 kg/(m²a)
SAVINGS
83 %
