Lemay And Atelier 21 Designs New Sustainable Envelope For The Grand Théâtre de Québec

  • Lemay And Atelier 21 Designs New Sustainable Envelope For The Grand Théâtre de Québec
  • Lemay and Atelier 21 design a sustainable building envelope, as a corrective measure for the Grand Théâtre de Québec
Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
  • Project: Grand Théâtre de Québec’s Restoration
  • All Images: Stephane Groleau

Text description by the architects*

Grand Théâtre de Québec’s restoration project has just been awarded four prestigious awards of excellence. Two have been presented by the Ordre des architects du Québec – the jury’s highest honours and the public’s choice. SAB Magazine has also recognized the project with the Green Building Award as well as the Royal Architectural Institute of Canada, for its innovative prowess. 

Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau

Prized for its brutalist architecture, the Grand Théâtre de Québec is a cultural icon. Lemay and Atelier were tasked with restoring and protecting the building’s crumbling outer shell and its emblematic Bonet mural, inside.

Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau

The new envelope is a delicate response to a complex problem. In developing corrective measures for the building’s many weaknesses, the transdisciplinary team produced a sustainable, innovative solution: adding a transparent, glass curtain wall to the concrete structure.

Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau
The glass casing was carefully designed in continuity with the structure developed by Victor Prus, the original architect, and the mural work of Jordi Bonet, enshrined by Prus’ protective outer shell. Discrete and almost immaterial at times, it reflects its surroundings and becomes the main interface with the city, adding an additional theatrical act in the discovery of this significant Quebecois work.
Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau
As designed, the thin wall of protective glass shields the Grand Théâtre from the elements by creating a secondary, tempered envelope housing a low-flow heat recovery and thermal mass system. The system is both energy-efficient and economical. Beyond its primary function, the new layer acts as an extension of the original building it protects, using the same finely tuned structural logic and composition.
Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau
Any alteration to the architecture had to be severely limited, says Eric Pelletier, architect and design principal at Lemay. The building’s fragility paired with the inability to directly access the concrete anchors posed a major challenge – with work on the building proceeding during normal daytime and evening theatre operations.
Grand Théâtre de Québec/Lemay and Atelier 21/Image © Stephane Groleau
Image © Stephane Groleau

“Similar to a play having been written 50 years ago, we had to revitalize le Grand Theatre using a new script that would resonate with a new generation, all while respecting and embracing Prus’ original work.”

– Eric Pelletier, architect, design principal at Lemay

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