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    Use of DELTA®-THENE at the LWL depot in Münster, Germany
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    Moisture barrier of 3,500 square metres

    Cold self-adhesive bitumen sheets (KSK) are usually used to seal vertical and horizontal surfaces against non-pressing seepage water or as masonry and L barriers in facing masonry facings. During the new construction of the central magazine of the Regional Association of Westphalia-Lippe (Landschaftsverband Westfalen-Lippe) in Münster-Coerde, such a sheet was able to prove itself in a totally different function.

    Name Central archive LWL
    Location Zum Rieselfeld 50, 48157 Münster-Coerde
    Country Germany
    Owner Regional Association of Westphalia-Lippe, Münster
    Installer Helmut Daume Dachhandwerk GmbH & Co. KG, Ahaus
    Products DELTA®-THENE, DELTA®-THENE KÄLTEGRUNDANSTRICH, DELTA®-PROTEKT, DELTA®-FLEXX-BAND, DELTA®-THAN
    Year 2019

    Museums in need of space

    The various tasks of the cultural department of the Regional Association of Westphalia-Lippe (LWL, Landschaftsverband Westfalen-Lippe) also include the operation, administration, and supervision of the museum of the association whose exhibition and thematic areas cover a wide spectrum of regional developments in the history of the region. Since the available exhibition space of the 18 museums belonging to the LWL is by no means sufficient to permanently show all the available exhibits, a large part is located in different depots. However, over the years this solution turned out to be uneconomical and some depots were already overloaded. To cover the need for storage space inexpensively, the LWL decided to build a new multi-communal central storage facility for approximately 14 million euros. Here a storage space can be offered also to other cities and municipalities in the area so to relieve their museum depots.

    A suitable location was found on the site of the called "Speicherstadt Münster". In recent years, a modern office and communication centre has been created here through the renovation and conversion of the administrative and functional buildings of the former Army Catering Main Office (Heeresverpflegungshauptamt), where parts of the LWL had already settled as tenants. The organisation of the construction project was entrusted to the LWL subsidiary WLV, which already has extensive experience in building and operating depots as a service provider for the municipalities at low cost.

    The design by the commissioned Münster architects Schoeps & Schlüter envisaged a three-storey depot building with over 10,000 m² of usable space on an economically oriented, square floor plan with a floor area of 60 x 60 meters. The externally insulated reinforced concrete construction should be equipped with a facing shell made of facing masonry on the ground floor; a horizontally structured metal cladding was provided for the surfaces positioned above.

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    LWL-Depot Münster
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    LWL-Depot Münster

    Safe moisture protection for paintings and giraffe

    The central magazine has housed a wide variety of museum exhibits since its opening at the beginning of April 2019. The spectrum ranges from archaeological finds and fossils to high-quality furniture, paintings, and sculptures from all epochs to the animal specimens belonging to the natural history museum.

    All archivariums have one common aspect: their storage places high demands on the uniformity of ambient temperature and air humidity. This is why the hermetically sealed reinforced concrete building had to be equipped with suitable room air conditioning systems which may be regulated in a different manner from one storage room to another. In turn, the sensitive air conditioning of the room requires an effective insulation of the building envelope. Furthermore, you had to ensure that no moisture could penetrate the inside of the building through the surrounding walls. Since the concrete walls alone cannot provide this security level, a moisture-blocking layer had to be applied over the whole surface from the outside. For this purpose, the cold self-adhesive sealing membrane  DELTA®-THENE  was chosen.

    This sealing sheet is a combination of a 4-fold cross-laminated special HDPE film equipped with a sealing and adhesive layer made of bitumen rubber. With an SD value of over 200 meters, the said sheet reliably prevents the diffusion of moisture from the outside into the concrete structure. In a second function, as a DIN-compliant waterproofing sheet in the area of the building plinth, it took on the tasks of the plinth sealing and the masonry barrier.
    The company Helmut Daume Dachhandwerk GmbH & Co. KG from Ahaus was commissioned to execute the sealing work.

    DELTA®-THENE in der Anwendung

    So the building was all-round tight, from the plinth to the attic

    The product DELTA®-THENE GRUNDANSTRICH was applied to the cleaned, dry concrete substrates of the foundation protrusion and the rising concrete wall, whereby, due to the incalculable temperature conditions, during the late autumn 2017, to be on the safe side, the variant cold primer was applied. The latter can be processed down to -5 ° C without any problems. After the primer had dried through after about three hours and reached sufficient adhesive power, the first sheet was glued in an L-shape along the floor and/or along the wall corner. Due to the high level of flexibility of the sheet and its excellent adaptation capacity, it was possible to dispense with the formation of a hollow throat. In the course of the next work step, the wall surfaces were sealed all around up to the later material change between the masonry and/or the metal facade.   

    After the completion of the approximately 75 cm high base masonry, built up in front of a layer of folded perimeter insulation panels, the second L-barrier followed. For this purpose, the fleece-lined EVA masonry barrier  DELTA®-PROTEKT was used by attaching it to the rising wall at the rear side with a continuous aluminium pressure strip. After that, the veneer could be bricked up to the planned height. In this area, mineral fibre insulation boards were used as thermal insulation.

    The next step consisted of the sealing of the outer walls of the two upper floors. The self-adhesive bitumen sheets were rolled down starting from the attic and then glued to the dried base coat by means of a pressure roller. In the attic area, they were temporarily secured against slipping by means of the product DELTA®-FLEXX BAND as well. 
    No further safety measures were required because after that the substructure for the metal facade was installed immediately. Overall, the sealing work was carried out on a total area of approximately 3,500 square metres without any problems and without interruption. The laying in the surface did not pose any great demands on the skilled craftsman since the corner formations in the plinth and on wall openings could be sealed easily and safely with suitable sheet cuts or with the product DELTA®-FLEXX BAND.

    Nothing stood in the way of a quick processing and a successful trade acceptance. After that, the metal facade was installed whereby its substructure fastenings provide an additional anti-slipping protection of the sheets.

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    Verlegung von DELTA®-PROTEKT
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    DELTA®-THENE in der Anwendung mit DELTA®-FLEXX BAND F100
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    DELTA®-THENE in der Anwendung
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