Cantilever
Definition and meaning of Cantilever in real estate.
A cantilever is a structural member or architectural element that projects horizontally and is supported on only one end, relying on a counterbalancing anchor on the opposite side.
In more detail
In residential design, cantilevers are used to create overhangs, balconies, or extended upper-level floors without the need for exterior vertical columns or support posts. The structural joists of the floor must extend backward into the building's interior, typically by a ratio of two-to-one, to securely anchor the projecting section.
While cantilevers offer modern architectural appeal and extra interior space, they require precise engineering to ensure structural integrity and prevent sagging. Additionally, because the underside of a cantilever is exposed to the elements, it must be properly insulated to prevent drafts and heat loss.
Key facts
| Category | Property Types & Construction |
|---|---|
| Applies to | Balconies, bay windows, and architectural overhangs |
| Required by | Structural building codes and engineering plans |
| Watch out for | Improper insulation of the cantilever floor, which can lead to cold indoor rooms |
A builder designs a modern house with a cantilevered master bedroom that extends four feet over the patio below, creating a covered outdoor seating area.
Frequently asked questions
Are cantilevered structures safe?
Yes, when engineered and constructed according to local building codes, they are completely safe and structurally sound.
How is a cantilevered floor insulated?
Builders typically use spray foam or rigid foam board insulation in the joist cavities to create an airtight seal against the exposed underside.