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Canteen of École Voltaire in Berlin 

Architecture à la carte

The urban development requirements of the 21st century - fast construction, lightweight building materials, sustainability, healthy living and CO2 reduction - make wood the building material of the present. Nevertheless, buildings in which both the structure and the building envelope are made of wood are not yet the norm in the urban context. Martin Schmitt - architect and trained carpenter - has now realised such a building in the middle of Berlin. For the roof construction of the school canteen in timber frame construction, LIGNO® Block Q3 Acoustic, which are cross laminated timber box elements from Lignotrend play a more than supporting role: The multifunctional, dimensionally stable overall packages combine statics, sound insulation, finished timber appearance and room acoustics. 

Configuration overview

Components used

  • LIGNO® Block Q3  |  Roof component

    Product code: LIGNO® Block Q3_310-450_rg0_sze_z26_p53_a50g_625-12-4_WTL_gb_b0
    Installation top


    Whether the element is open or closed at the top is determined by the area of application. If, for example, the element is to be filled with fill on site as a storey ceiling or roof terrace (LIGNO® Rippe Q3-x), its cavities are open at the top (feature _r0). To guide pipes at the top of the element, a cross grid (_r25, _r50) can be added to some superstructures. For roof superstructures, there is usually a flat closed finish _rg0 (LIGNO® Block Q-x, LIGNO® Block Q3-x or corresponding versions of LIGNO® Acoustic classic).

    Installation top

    _rg0 Closed, without cross grid

    Statics


    The height of the load-bearing webs of the element is variable and determined according to static requirements from load and span. Within the framework of this configurator, the selection is limited to four height ranges. A more precise definition is made later during pre-dimensioning or verification with the LTB-x calculation programme. Bulk volume and/or necessary space for installations can also be decisive for the height.

    Statics 

    _310-450 Large span

    Fire resistance


    If fire protection is required, an additional layer is added below the web area (for elements with strip profiles _z26, _z53, _z80, for elements with board profiles Akustik klassik _k50g). Their height determines the fire resistance duration of the cross-section from 30 to 90 minutes. The fire resistance must be statically verified. If there are no requirements, the standard versions _z0 or _k50l are to be selected.

    Fire resistance

    _z26 REI 30 Fire resistance

    Cavity


    Panel designs with slat profiles and additional layer can be configured with an additional cavity (_p26, _p53) below the additional layer for installation guides, fixtures or to improve sound absorption. Cables laid there then do not penetrate the fire-protection layer. If required, the cavity is filled with insulating material (_p26mw, _p26ha) to improve acoustic absorption. If no cavity is necessary, the characteristic _p0 is selected.

    Cavity

    _p53 53mm Height

    Room acoustics


    If the soffit of the element is to have a good sound-absorbing effect, the penultimate layer is configured as absorber _a50g. Otherwise, this layer is configured as a solid wood layer _a0.

    Room acoustics

    _a50g Integrated absorber

    Profile


    The visible layer is profiled with joints. The code for profiling indicates in millimetres: Element width, strip width (rounded, from/to if applicable) and joint width (rounded) as well as a letter identification for variants, e.g. with chamfered strip edges or with additional height gradation.  

    Note: Some profiles indirectly cause exclusions for other configuration options.

    Profile 

    _625-12-4 Slat profile

    Wood type


    Various wood species are available for the visible layer. For quality reasons, individual wood species cannot be configured for all profiles; for technical reasons, surface treatments are excluded for some wood species.

    Wood type

    _WTL Silver fir knotless, patterned

    Structure


    The face is subjected to a brushing _gb as standard, which produces a stronger or weaker structure depending on the type of wood and makes the surface less sensitive to scratches.  Alternatively, a smooth sanding _gs can be carried out, or on request a bandsaw cut _grimitated.

    Structure

    _gb Brushed

    Treatment


    Depending on the type of wood, the optional application of a surface treatment is possible ex works. Individual colour finishes are always sampled for coordination. For elements in individual lengths, colour treatment is limited to max. 5 m length.

    Treatment

    white varnish (on site)

Reference-related

Downloads

Project participants

  • Martin Schmitt Architektur / Kommunikation im Raum 

    Architect

    Prinzenstraße 84

    10969 Berlin
     

    www.m2sb.de

  • Walter Kastor GmbH & Co. KG

    Execution

    Alte Mainzer Straße 24
    55430 Oberwesel

    www.holzbau-kastor.de

  • Axel Hartmann Fotografie

    Photographer
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