![]() ![]() Essentially a concrete slab can be cantilevered to any distance, provided there is sufficient back support, reinforcement, and slab thickness. T his reinforcement extends backward into the rest of the concrete slab, usually to a distance that is at least twice that of the cantilever’s span.Ĭoncrete cantilevers also require extra concrete depth to allow the slab to support itself. Naturally, a concrete cantilever will work slightly differently from a timber cantilever.Ĭoncrete cantilevers require additional reinforcement placed inside the concrete at the time of construction. How Far Can You Cantilever A Concrete Balcony?Ĭoncrete balconies also need a significant amount of back support to ensure that the cantilever can hold its own weight. This figure, translated to the well-known ratio of 1:3, is generally agreed upon. T he American Wood Council states that a cantilever can be built to ¼ of the joist’s total span. For example, some building departments say that a timber joist cantilever cannot extend more than two feet from the building. Some regulatory authorities stipulate the maximum span of a cantilevered balcony. It’s important to remember that a cantilevered joist will place additional stress on the primary span of the joist, so its ordinary maximum span is somewhat reduced when used as a cantilever. Whereas joists placed further apart will be placed under more stress when used in a cantilevered balcony. Naturally, closer joist spacing will be better able to support the load of a cantilever. ![]() The next consideration is the joist spacing. Higher grade timber is inherently stronger and will perform better in a cantilever application. ![]() Another consideration is the grade of the timber. This is often dependent on their density. Different types of structural timber possess different strengths, and different types of timber are better suited for a cantilever. Secondly, you must consider the type of wood that will be used. Naturally, the depth and width of the joist will have a major impact on the load it can carry and how much extra load stress it can endure from a cantilever. Not only do different types of timber perform differently, but several other aspects of the timber will play a large role in the ability of the timber to create a cantilever.įirstly, you must consider the size of the joist that will be used to create a joist cantilever. Timber-framed balcony cantilever capabilities depend largely on the timber itself. How Far Can You Cantilever A Timber-Framed Balcony? ![]() This can only be achieved if there is sufficient depth and reinforcement for the slab. Concrete cantilevers can be built with less backspan, with some arguing a ratio of 1:2 cantilever to backspan. This means that this type of balcony will require a backspan three times the length of the cantilever to be successful. This is important to ensure that these balconies remain safe for all users throughout their lifetime.Īs a general rule, timber cantilevers must be built at a ratio of 1:3 – cantilever to backspan. Several regulatory authorities govern the span of cantilevered balconies. Concrete, steel, and timber cantilever balconies all have different requirements and restrictions for their successful construction. Firstly, you must consider the materials from which the balcony will be constructed. How far a balcony can be cantilevered is dependent on several factors. ![]()
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