Cover picture „View from Süderstraße“
The “Störtebeker-Haus” is situated in the Süderstraße, close to Hamburg downtown. An
office and commercial building, which was opened in 2006 and due to its remarkable
architecture looks more alike a building of the beginning 19th century than a contemporary building.
The building owner, a very successful Hamburg businessman, wished to erect a building, fitting in the history and traditional architecture of the Free Hanseatic City and appealing to the population. He even included the opinion of the Hamburg citizens, by advertisement, for the planning of the design of the façade.
The result is very attractive; it is a building with different architectural styles, constructed with precious building materials and in high quality. It demonstrates impressively the various scopes for design which are possible with the building material natural stone as well as the beauty and variety of this natural building material and the architectural art and quality of the traditional stonemason trade.
While the exterior architecture is dominated by the Obernkirchener Sandstone in combination with fired klinkers, a composition of various natural stones, in combination with high-quality stucco works, lend their character especially to the four stair cases and the lobbies in the interiors.
Photos 2 and 3: „every day at 12.00 a.m. the carillon in the tower reminds of the execution of the pirate Klaus Störtebeker and his followers”
Also the name of the building reminds of the history of the city.
Besides the architecture, also the name of the building “Das Störteker-Haus” demonstrates the relatedness of the building owner to the city of Hamburg.
The buccaneer Klaus Störtebeker, together with the pirate Goedeke Michels and his
followers, ambushed the merchant ships by the end of the 14th century in the North Sea, thus inflicting serious losses to the traders of the Hanseatic League. Seamen of the “Free Hanseatic City” put a stop to these illegal actions in the year 1400.
Klaus Störtebeker and his followers were overpowered in the year 1400 (or 1401, historians dispute about the date) in the North Sea, nearby the island of Helgoland, and executed by beheading on the 21st October of the same year in Hamburg.
Probably, the tales, describing the boldness of his struggle in the course of his arrest in the North Sea, are the reason why many anecdotes and legends have grown up around the person of Klaus Störtebeker. Among others, as legend had he run past eleven of his followers after his beheading, until the hangman tripped him up.
In the tower of the building there is a carillon with a musical clock, which reminds of the execution of the pirate captain and his followers at 12.00 a.m. every day.
The natural stone works in the interiors
Photo 4: „Precious natural stones dominate in the stair cases as floor and stair coverings“
Photo 5: „Natural stone flooring with the Hamburg emblem as bronze-inlay in the lift, installed with Keralastic“
The interior decoration is essentially characterized by the design with different types of natural stones. The artful combination of various types of stones gives the stair cases and halls a special elegance as well as quality and valency.
The building owner’s requirement was to design the stair cases as the visiting card of the building.
The following natural stones were mainly applied: Mugla White, Crema Valencia
and Verde Guatemala.
A special demonstration of the interior design with the „building and decoration material“ natural stone is the star in the main entrance hall, constructed with high perfection and masterly handicraft, of the stone types Azul Cielo, Nero Belga, Estremoz, Crema Valencia and Rojo Alicante, orientated to the north, with an integrated wind rose.
The star was prefabricated of 8 large-format elements and, after calibration by laser
technology, installed with Mapei-products.
Mapei installation products and their application
The most important requirements on the installation products were the securing of the
permanent adhesion of the various natural stones, considering the loads resulting from the use specific for the building, and the prevention of changes of the stone-specific colours, after the installation.
From these required characteristics derives the application of mortar systems with rapid hardening and drying, so called Tri-Calcium-Aluminate-binders.
Thanks to very intensive research and development activities, Mapei has a specialised
knowledge of the production of materials of this special category and offers a complete system, which has proved itself best for more than 15 years in a lot of challenging objects, in connection with stone types, sensible to deformation and discolouration. The system includes the following products:
Mapecem fast drying and fast hardening hydraulic screed binder with effective crystalline water absorption
Granirapid two-component, fast drying, fast hardening, thin and medium
layer-bed mortar with effective crystalline water absorption
Mapestone 1 one-component, fast hardening, fast drying medium layerbed
mortar with effective water absorption
Ultracolor flexible, fast drying and fast hardening grouting mortar with
effective water absorption
After intensive cleaning of the support, the mortar bed was applied, using the fast setting hydraulic binder Mapecem, in combination with a bonding slurry of Planicrete / water and
Mapecem, and extremely densified.
After application of the special thin layer bed mortar Granirapid on the complete fresh material mixture area and back-buttering of the element slabs, they were installed under pressure and utmost care.
After hardening (>4 hours) the joints were grouted with Ultracolor.
Photo 6 „The star - installation of 8 pre-fabricated elements“
Photo 7: „Application of the Mapecem installation mortar on a bonding slurry made of Planicrete emulsion“
Photo 8: „Pre-fabricated elements, back-buttered with Granirapid as bonding slurry“
Photos 9 and 10: „Installation of the elements“
Installation of natural stones on the stairs
As the stair construction is embedded in the shear walls, the installation of a high-quality sound insulating system was necessary to avoid the propagation of the subsonic noise to the adjoining offices and the neighbouring business building.
Due to the lack of constructional height, the necessary sound insulating rate had to be obtained by a high-performance, thin system.
The Mapei-Mapefonic system features the necessary insulating characteristics and rigidity. These pads with a thickness of only 10 mm, made of a bitumen with special fibres and with a multi-ply, factory-mounted fibrous web on the bottom-side, has a noise reduction value of 17.6 dB (at standard test).
All stair cases were perpendicularly set. This required the initial check of each floor by laser, before the step treads and risers and the “mitres” adjoining to the stair walls, were installed with the also fast hardening and fast drying, but one-component medium layer bed mortar Mapestone 1.
The installation of the “mitres” required an exact, perfectly fitted execution of the step tread and riser slabs.
Bild 11: „Flight of stairs and platform upon completion“
Photo 12: „Installation of the sound deadening system Mapefonic“
Photo 13: „Installation of the riser and step treads with Mapestone 1“
Photos 14 and 15: „Installation of the slabs on
the platforms with Granirapid on a Mapecemmortar“
Photo 16: „The view into the stairwell shows the staircase upon completion“
Building owner: Achim Becker, Grundstücksverwaltung,
Architect: Architektenteam Tipke
Innungsstraße 11, 21244 Buchholz
Material coordinator: Graniteland Georg Blank
Vor dem Glumm 6, 27356 Rotenburg
Installation of steps, floorings
Wall socket and “mitres”:
Installation of exterior
supports, lift portals, wall
Bauunternehmung Hermes Sp.z.o.o.
Kölner Str. 72, 40723 Hilden
Hamburger Str. 125, 22083 Hamburg
and coordination of natural
Millrather Weg 6, 40699 Erkrath
Supplier natural stones: MGL Marmi Graniti Lapidei S.r.l.
19030 Castelnuovo Magra (SP) Italien
Technical assistance: Mapei GmbH
Walter Mauer, Werner Friesenkothen