Primary school with BauBuche supporting structure

When the Hohenstange primary school in Tamm became an all-day school, it needed more space. The architects of k+h Architekten who were contracted to design the extension opted for a sustainable and exposed support structure in BauBuche.

Primary school in detail

Proprietor Gemeinde Tamm, Germany
Location Ulmer Straße 20, 71732 Tamm
Design / architects Kilian + Partner GmbB, Johannesstraße 23, 70176 Stuttgart
Structural design Helber + Ruff, Ludwigsburg
Timber construction Holzbau Pfeiffer, Burglemitz 37, 73768 Remptendorf
Photographer Philip Kottlorz, Kniff Projektagentur
Area 750 m²
material 94.54 m³ BauBuche S board
Construction October 2014 - June 2016

  • Floor plan

    In addition to a large canteen, which is at the heart of the extension, the new building comprises auxiliary rooms, a teaching complex with three classrooms and a multi-purpose room. The floor plan follows the topology of the site, with the canteen at the centre of the school yard, connecting the existing and the new building. To the north, we have the new classroom block with its curved façade.

    Pollmeier BauBuche - TAMM Schule mit Holztragwerk
    Pollmeier BauBuche - TAMM Schule mit Holztragwerk

    Floor plan of school extension

  • Choice of material & sustainability

    The supporting structure of the timber frame and roof construction is made in BauBuche, whereby the exposed, tightly arranged posts and beams provide for an attractive interior. Apart from BauBuche, the dominating materials are concrete and rubber.

    For this project, the municipal council wanted to use sustainable construction materials. That is why all main support and façade elements of the new extension are made in timber or wood-based materials.

    The planted roof emphasises the green thinking behind the construction project.

    Tragstruktur und Fassade der Grundschule Tamm aus Holz
    Tragstruktur und Fassade der Grundschule Tamm aus Holz

    School corridor

  • Façade design & wall construction

    The façade reflects the arrangement of the interior BauBuche posts. Vertical clap board elements of various size are mounted between cladding profiles made in fir. The façade thus consists again mainly of timber and wood-based materials. With its segmented structure and protruding, rib-like elements, it has an organic look where light and shade create interesting effects.  

    Pollmeier BauBuche - TAMM
    Pollmeier BauBuche - TAMM

    Wall construction with rainscreen cladding

    Timber frame elements are mounted between the BauBuche post and beam construction. To eliminate thermal bridges, the entire wall structure is packed in 80 mm wood fibre insulation boards.

    Pollmeier BauBuche - Außenansicht der Grundschule Tamm mit Holzkonstruktion
    Pollmeier BauBuche - Außenansicht der Grundschule Tamm mit Holzkonstruktion


    Pollmeier BauBuche - TAMM
    Pollmeier BauBuche - TAMM

    Section of wall connection of roof supporting structure

  • Roof supporting structure

    The proprietors wanted to make sure that the new building could be easily transformed, in line with changing needs. For financial reasons, the initial idea of a free-spanning framework had to be dropped and was replaced with a fan-shaped roof structure consisting of single-span beams and posts.

    The building however maintained the character of a large hall, emphasised by the materials used in the roof construction. For structural strength and aesthetic reasons, the initial plan to use spruce glulam was quickly dropped in favour of BauBuche.

    The BauBuche veneer structure is visible from inside the canteen, with the pattern extending naturally from the narrow sides of the posts along the exposed bottom side of the girders. As this was not achievable with a conventional BauBuche construction, the architects designed a supporting structure made of screwed BauBuche S boards where the veneer structure is exposed at the bottom of the beams. The fasteners were not concealed but used as a design feature, with black bolts set off against the light-coloured beech.

    The main girders above the canteen span approx. 17 m, with spans of around 11 m elsewhere in the building. Secondary beams are only found in the canteen roof, where they are arranged diagonally between the main beams, providing additional support.

    Pollmeier BauBuche - TAMM Rahmen und Deckenkonstruktion aus Holz
    Pollmeier BauBuche - TAMM Rahmen und Deckenkonstruktion aus Holz

    Ceiling of canteen

    The acoustic panels installed between the beams cover the technical installations such as cables and ducts.

    Pollmeier BauBuche - TAMM
    Pollmeier BauBuche - TAMM

    Ventilation duct behind acoustic ceiling panel

  • Verdict of architect & structural engineer

    For architect Oliver Krause from k+h Architekten and structural engineer Jürgen Helber from Helber + Ruff, this was the first project in BauBuche.

    Jürgen Helber (Helber + Ruff):

    "The key advantage of the material is its excellent strength. In other projects, we are now considering BauBuche as a substitute for steel beams, and also use the timber material where small cross-sections are desired that cannot be achieved with conventional glulam elements. We think that there is a huge potential for BauBuche where needle beams and auxiliary beams are necessary and the construction height is limited. Such solutions have also many advantages for timber construction contractors, as all work can be done by the contractor himself, joints and connections can be established relatively easily, and there is no need for fire-protection coating. Also, BauBuche can be easily combined with other materials. Where deformation is a key factor, BauBuche might however not always be the best solution."

    Oliver Krause (k+h Architekten):

    "We were won over by the homogeneous look and surface finish of the material. Also, BauBuche is very hard and strong. Compared with other softwood products, there are much fewer knots. However, the fact that BauBuche is so hard and strong caused us some headaches when it came to the machining of the elements. On the other hand, in a school building, resistance to wear and tear is a huge advantage, and BauBuche is nearly as robust as concrete."

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