Building facade system and related assemblies including a bypass insulating profile

1. A window assembly mountable to mullions provided across a window opening of a building facade for covering at least partially said window opening, the window assembly comprising:

a window panel positioned in alignment with the window opening so as to extend between an interior environment and an external environment of the building facade;

a window profile assembly mechanically connecting the window panel to the mullions of the window opening, the window profile assembly comprising:

an exterior profile securable to edge portions of the window panel, and

an interior profile securable to the mullions; and

a thermal break assembly for reducing a thermal flow between the interior environment and the external environment via the window profile assembly, the thermal break assembly comprising:

a connection insulating profile mechanically interconnecting the interior profile and the exterior profile, the connecting insulating profile having a lower thermal conductivity than both the exterior profile and the interior profile, to reduce thermal conduction between the interior profile and the exterior profile, and

a bypass insulating profile extending from the connection insulating profile externally towards the window panel and inwardly over the exterior profile, to define an air chamber between the bypass insulating profile and an inward surface of the exterior profile, thereby reducing thermal convection between the interior environment and the exterior profile.

2. The window assembly of claim 1 , wherein the bypass insulating profile has a lower thermal conductivity than the exterior profile, and the bypass insulating profile has a lower thermal conductivity than the connection insulating profile.

3. The window assembly of claim 1 , wherein the connection insulating profile comprises two opposed insulating halves, spaced away from each other so as to define an air gap therebetween, each of the two halves has a proximal end engaged within a corresponding recess of the interior profile, and a distal end engaged within another corresponding recess of the exterior profile.

4. The window assembly of claim 1 , wherein the connection insulating profile comprises an inner surface and the bypass insulating profile contacts the inner surface of the connection insulating profile.

5. The window assembly of claim 1 , wherein the connection insulating profile comprises two protrusions extending inwardly to form a jaw with a connection recess defined in-between, and wherein the bypass insulating profile has an internal end portion engaged within the connection recess of the connection insulating profile.

6. The window assembly of claim 1 , wherein the air chamber extends continuously from an internal end of the bypass insulating profile to an external end of the exterior profile.

7. The window assembly of claim 1 , wherein an external end portion of the bypass insulating profile mechanically engages with a portion of the inward surface of the exterior profile at an external end thereof.

8. The window assembly of claim 1 , wherein the bypass insulating profile and the exterior profile are spaced-apart from an inner surface of the window panel, and the window assembly further comprises at least one seal extending between external end surfaces of the bypass insulating profile and the exterior profile and the inner surface of the window panel.

9. The window assembly of claim 8 , comprising a gasket seal provided between the external end surface of the bypass insulating profile and an inner surface of the window panel for mating and sealing therebetween, and a silicon seal filling a hollow channel formed inwardly of the gasket seal, the inner surface of the window panel, and the external end surface of the exterior profile.

10. The window assembly of claim 9 , wherein the bypass insulating profile is connected to both the gasket seal and the exterior profile.

11. The window assembly of claim 1 , wherein a portion of the interior profile is disconnectable from the mullions so as to enable splaying of the window assembly about a mullion axis, externally thereof.

12. A curtain window wall comprising a plurality of window assemblies as defined in claim 1 , each window assembly being independently mountable onto the mullions of the window opening to form the curtain window wall extending across an entire surface of the window opening.

13. The curtain window wall of claim 12 , wherein two adjacent window assemblies are in a symmetrical configuration with respect to one mullion.

14. The curtain window wall of claim 12 , wherein the window panels are in a coplanar relationship with one another.

15. A building facade system for covering a building facade including a building wall and a window opening defined in said building wall, the building facade system comprising:

at least one window assembly mountable to mullions provided across the window opening, the window assembly comprising:

a window panel positioned in alignment with the window opening so as to extend between an interior environment and an external environment of the building facade;

a window connecting assembly mechanically connecting the window panel to the mullions of the window opening, the window connecting assembly comprising:

an exterior profile securable to edge portions of the window panel, and

an interior profile securable to the mullions; and

a thermal break assembly for reducing a thermal flow between the interior environment and the external environment via the window profile assembly, the thermal break assembly comprising:

a connection insulating profile mechanically interconnecting the interior profile and the exterior profile, the connecting insulating profile having a lower thermal conductivity than both the exterior profile and the interior profile, to reduce thermal conduction between the interior profile and the exterior profile, and

a bypass insulating profile extending from the connection insulating profile externally towards the window panel and inwardly over the exterior profile, to define an air chamber between the bypass insulating profile and an inward surface of the exterior profile, thereby reducing thermal convection between the interior environment and the exterior profile; and

a plurality of wall assemblies surrounding the at least one window assembly, each wall assembly being independently mountable onto rails extending across the building wall and comprising:

a wall panel for covering a portion of the building wall, the wall panel being spaced-apart from the building wall, and

a wall connecting assembly comprising at least first and second interconnected profiles, the first profile mechanically engaging a perimeter of the wall panel and the second profile mechanically engaging the rails of the building wall.

16. The building facade system of claim 15 , comprising a plurality of window assemblies for covering the window opening, each window assembly being independently mountable onto the mullions of the window opening to form a curtain window wall spreading over an entire surface of the window opening.

17. The building facade system of claim 15 , wherein the at least one window assembly and the wall assemblies are arranged with respect to one another in accordance with the positioning of the window opening of the building facade.

18. The building facade system of claim 15 , wherein the window panel is in a coplanar relationship with the adjacent wall panels.

19. The building facade system of claim 15 , wherein the window connecting assembly is staggered with respect to the adjacent wall connecting assemblies to make up for a gap between the rails and the mullions along the building facade.

20. The building facade system of claim 15 , wherein the air chamber extends continuously from an internal end of the bypass insulating profile to an external end of the exterior profile, and wherein the external end of the bypass insulating profile mechanically engages with a portion of the inward surface of the exterior profile at an external end thereof.