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16 POLYVALENT HALL, LE VAUD You don’t get the


impression of being in a sports hall. It’s more like a traditional stable, transformed into a


contemporary object Laurent Saurer


with specifying locally sourced materials. Naturally, the white pine also locks in significantly more carbon compared to some other choices, a contributing factor to the scheme’s Passivhaus certification. “We think that every building should be very well insulated and should correspond to certifications,” says Saurer.


Reaping the rewards TIMBER TREATMENT


The timber elements on the exterior have been treated with Lasure varnish, which will allow the wood’s hue to fade gradually as it ages from light orange to grey All images © Matthieu Gafsou


PROJECT FACTFILE


Architects: LOCALARCHITECTURE (Laurent Saurer, Manuel Bieler, Antoine Robert-Granpierre) Wood engineer: Ratio Bois Sàrl, Ècublens Civil engineer: 2M ingénierie civile SA, Yverdon-les-Bains CVS engineer: Weinmann-Energies SA, Èchallens Lighting: Etienne Gillabert, Paris, Aebischer & Bovigny, Lausanne Geometric engineer: Bovard & Nickl SA, Nyon Client: Commune of Le Vaud Built area (footprint): 1,209 m² Volume: 9,207 m³


Timber elements on the outside are treated with Lasure varnish, which will allow the wood’s hue to fade gradually as it ages. “Currently,” says Saurer, “the exterior timber is a light orange colour, but the wood will eventually fade to grey, which will compliment the grey and black steel plate material on the rest of the building. It’s the natural life of the wood.” White pine is used almost exclusively throughout the interior, constituting both the walls and ceilings. The wood is treated with a UV protective solution on the inside, helping maintain the wood’s bright colour and keeping the internal spaces light-filled naturally. Also conscious of the noise expected from large swathes of children playing and the hosting of local functions, keeping acoustics under control was also a priority for the design team who, in response, specified a lightweight timber solution – Lignatur.


The prefabricated Lignatur elements incorporate cavities and perforations which not only provide acoustic treatment for the hall, but structure and thermal insulation too, all the while cutting down on the amount of material required due to their hollow design. The result, in Saurer’s words: “You don’t get the impression of being in a sports hall. It’s more like a traditional stable, transformed into a contemporary object.”


The primary sustainability benefit of using white pine comes from the reduced transportation costs that go hand in hand


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Setting aside the fire that ravaged the first construction in July 2016 and the soul-searching that followed, Saurer says the most difficult part of the project “was the installation of the main beam over the sports hall.” The U-shaped ridge beam of the main hall incorporates all the technical equipment required for sports activities such as rings, movable basketball hoops, and lighting, which leaves the hall ceiling free from any visible technology. Between these main beams, secondary structures made of Lignatur panels support the roof. Because of the size of the main beam – measuring 2 metres thick and 40 metres long, it also had to be split in two for transportation purposes, then reassembled on site. The completed project has been awarded the Swiss award Distinction Romande d’Architecture 2019 and the 2019 International Wood Prize, as well as receiving an honourable mention by Prix Lignum, a Swiss co-operative promoting innovation in timber design. Notwithstanding industry accolades, for the client and Le Vaud itself, its Polyvalent Hall will have a far greater impact as a place where the community gathers and innumerable beneficial experiences are had. When building the second time round, only minor changes to internal fixtures were made, making the end product and the original design submission very similar. When asked if he would change anything about the final design, Saurer responds with a resounding “no.” He expands: “In a way, we’ve had the luck to do this twice. I think the project is incredible.” 


ADF AUGUST 2019


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