Curtain wall
A curtain wall is a non-structural exterior wall system, usually glass and metal, that hangs from the building frame and carries only its own weight and the wind load it receives.
A curtain wall is a non-structural exterior wall system, usually glass and metal, that hangs from the building frame and carries only its own weight and the wind load it receives.
Definition
A curtain wall is an outer skin attached to the edges of floor slabs or the frame. It keeps weather out and lets light in, but it does not hold up the floors or roof.
A plain example
Illustrative example: an office building has a glazed front made of aluminum framing and insulated glass units. Each unit is hung from anchors at the slab edge, and the floors behind it are carried by the structural frame.
Why it matters
It is a major envelope decision that affects daylight, energy performance, water control and cost, and it is usually specified and tested as a system.
Common confusion
A curtain wall is not a storefront. Storefront systems are generally lower, single-story glazing. A curtain wall is also not a load-bearing wall.
On a project
Ask for the system's test reports on air, water and structural performance, the anchor design, and how movement and water are managed at slab edges. Check that the specification and shop drawings agree.
Quick answers
- Is a curtain wall load-bearing? No. It carries its own weight and passes wind load to the structure.
- What are curtain walls made of? Commonly aluminum framing with glass, though panels of other materials are used.
- Who designs the anchors? That is set by the project engineering and the system supplier. Confirm it in the submittals.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
Is a curtain wall load-bearing?
No. It carries its own weight and passes wind load to the structure.
What are curtain walls made of?
Commonly aluminum framing with glass, though panels of other materials are used.
Who designs the anchors?
That is set by the project engineering and the system supplier. Confirm it in the submittals.
Sources and further reading
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