Casa Rossa Chemnitz
State of repair
Aim of retrofit
bodensteiner fest Architekten BDA, Stadtplaner PartGmbB
Ickstattstraße 9 Rgb, D 80469 München
Tel. 49 (0)89 89223388
Hygrothermal assessment Thermal bridge calculations for individual components
Life Cycle Analysis (LCA) No LCA tool applied
Other Die ursprünglich verputzte Fassade wurde als sichtbare Ziegelfassade ertüchtigt und prägt das Erscheinungsbild
Street facade unplastered
Backyard facade with cladding
The tectonics of the facade were further worked out: concrete lintels, cornices and steel girders were restored, reveals were insulated, the brickwork with cassettes and pilaster strips was re-grouted and coated with a light mineral glaze and made hydrophobic. The joints of the facades have been refurbished and the facade has been hydrophobized with a 20-year warranty and is maintained like a facade painting.
Window formats have been kept, the outside trims have been articulated. The view of the street side was not changed. On the garden side, balconies were added
The rear courtyard facade was made with 12cm mineral WD as ETICS with 15mm thick plaster
The rear courtyard facade was largely retained in terms of design, door openings for balconies were necessary to increase living quality, the balconies were placed in front of them as a light steel construction
Wooden window with insulated window frame, visible from the inside
Accurate bezels hide the window frames and hold the narrow window sashes. They stand in contrast to the rough brick facade with all its irregularities and the visible wounds of the last century. The tectonics of the facade was further worked out: concrete falls, Cornices and steel girders were restored, the brickwork with cofferings and pilaster strips was re-grouted and coated with a light mineral glaze and made hydrophobic.
The windows were exchanged and replaced with new windows. The wall connection was made with adapted insulation frames
MEASURES TO INCREASE AIRTIGHTNESS
The roof was completely demolished and rebuilt using demolition bricks. By opening the roof side on the courtyard side, additional living space is created, which is oriented towards a spacious roof terrace with sliding doors.
The roof view of the street side was changed minimally, the flat built-in parts in the roof were adapted in color to the roof covering. Roof terraces were integrated on the garden side, these are not visible from the garden.
The floor to the cellar, a cap ceiling, was insulated with perlite fill (on average approx 8cm, on top of it insulation of the underfloor heating 4cm)
The insulation was invisibly applied to the existing cap ceiling and does not impair the visual appearance
All windows were connected to be wind and rainproof. The building envelope and the roof were made windproof, a blower door test was carried out
DOMESTIC HOT WATER
A completely new heating system was installed. A solar system supplies floor heating and domestic hot water. Many close-meshed heating circuits have been laid to optimize solar use for low-temperature heating.
The existing shafts were largely used. The heating was designed as underfloor heating because the floors had to be completely renewed. Cables were partially laid on the plaster.
Exhaust system for internal bathrooms with overflow opening, fresh air supply via window rebate ventilation
Exhaust air is moved into shafts
Solar thermal system for domestic hot water and heating support. Heating system with gas boiler
Thermal solar collectors match the color of the roof
RENEWABLE ENERGY SYSTEMS
Solar thermal collectors
The color was adapted to the roof skin. A roof-top system was chosen to enable simple reversibility of the technical component as soon as there are fully compatible components in terms of design, which is often a requirement for monument protection. Together with the roof windows, they represent a neglibible disturbance of the roof landscape. The installation of components for the generation of renewable energies are often privileged compared to the preservation of monuments. So far there are no adequate components in terms of color and haptics.
Voluntary certificates: No
Primary Energy 62,8 kWh/m2.y
Consumption_estimation_After: 55,3 kWh/m2.y
Consumption_estimation_After: 62,8 kWh/m2.y
Description: Annual billing of energy consumption
The building envelope was made airtight with new, highly efficient windows. The roof was provided with maximum insulation thickness. There was positive feedback on comfort from users
In summer, the building mass and the cellulose roof insulation ensures an appropriate temperature level. In winter, the underfloor heating offers radiant heat at the highest level of comfort
The existing window sizes have not been changed, they offer adequate lighting comfort. The attic apartment was provided with roof windows and large terrace windows for the best lighting conditions.
The floors have been upgraded according to the acoustic standards. All HVAC istallations comply with acoustic norms
The renovation standard was adapted to the state of the art and comfort. A market analysis showed an economic viability for the chosen renovation strategy