this roof access is developed like a doorway to the ceiling of the central room of a dwelling, framing views directly to heaven. This thin opening now allows a large amount of light and clarity to enter the dining room and the central circulation area, which are very dark before the work is done. A new openwork staircase with central stringer and solid oak steps extends the original staircase to the new roof exit along an existing brick wall highlighted by the lightness of this contemporary interior addition. In an intervention approach respectful of the existing, the original moldings and ceiling ornaments have been modified to integrate with the new design. The staircase ends on a clear and generous reading space despite the constraints of area of ​​the municipality for access to the roof (15m ²). This space opens onto a roof terrace and a panorama from the Olympic Stadium to Mount Royal.