Use of DELTA®-THENE at the LWL depot in Münster, Germany

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
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