Hi,
I am planning to convert a barn/shed into a residential house with a workshop (hobby use).
The barn was designed and likely built in 1966. It is built on a strip foundation (900 mm thick (35 inches)), and the floor has a 100 mm (4 inches) concrete slab. At a height of 4 m (13 feet), there is a ring beam running along the 300 mm (12 inches) thick exterior wall, which is 500 mm (20 inches) high and 300 mm (12 inches) wide.
This barn has 203 m² (16 m (52.5 feet) wide by 13 m (43 feet) deep) of usable space and is to be developed, with a workshop and garage in the front part and additional rooms at the back. Additional strip foundations will probably be added, and load-bearing walls constructed. On top of this 4 m (13 feet) high structure, another floor of about 130 m² (1,400 sq ft) is planned. Given the existing conditions (which will be explained in more detail when the project is presented), it makes the most sense to build this new floor across the full 16 m (52.5 feet) width, with a depth of 8.5 m (28 feet). The roof will be a mono-pitch with a 5° slope toward the front of the house, meaning the main roof load will be on the front wall. The exterior walls on the right and left will rest on the old masonry, including the ring beam and concrete slab. The rear exterior wall will stand on a new load-bearing interior wall. The front wall is the main reason for this post. For design reasons, I would prefer not to align the front wall flush with the existing wall, since otherwise there would be a 16 m (52.5 feet) wide and 7.5 m (25 feet) high continuous house front. I am thinking about a cantilevered overhang (unsupported) for the upper floor.
Now the question is: can anyone roughly estimate what overhang is feasible depending on the thickness of the concrete slab? From my point of view, the wall thickness of the upper floor’s exterior wall, which is 36.5 cm (14 inches), should be the absolute minimum, since shear forces are probably the least concern for a concrete slab, right?
Best regards from the Rhineland
I am planning to convert a barn/shed into a residential house with a workshop (hobby use).
The barn was designed and likely built in 1966. It is built on a strip foundation (900 mm thick (35 inches)), and the floor has a 100 mm (4 inches) concrete slab. At a height of 4 m (13 feet), there is a ring beam running along the 300 mm (12 inches) thick exterior wall, which is 500 mm (20 inches) high and 300 mm (12 inches) wide.
This barn has 203 m² (16 m (52.5 feet) wide by 13 m (43 feet) deep) of usable space and is to be developed, with a workshop and garage in the front part and additional rooms at the back. Additional strip foundations will probably be added, and load-bearing walls constructed. On top of this 4 m (13 feet) high structure, another floor of about 130 m² (1,400 sq ft) is planned. Given the existing conditions (which will be explained in more detail when the project is presented), it makes the most sense to build this new floor across the full 16 m (52.5 feet) width, with a depth of 8.5 m (28 feet). The roof will be a mono-pitch with a 5° slope toward the front of the house, meaning the main roof load will be on the front wall. The exterior walls on the right and left will rest on the old masonry, including the ring beam and concrete slab. The rear exterior wall will stand on a new load-bearing interior wall. The front wall is the main reason for this post. For design reasons, I would prefer not to align the front wall flush with the existing wall, since otherwise there would be a 16 m (52.5 feet) wide and 7.5 m (25 feet) high continuous house front. I am thinking about a cantilevered overhang (unsupported) for the upper floor.
Now the question is: can anyone roughly estimate what overhang is feasible depending on the thickness of the concrete slab? From my point of view, the wall thickness of the upper floor’s exterior wall, which is 36.5 cm (14 inches), should be the absolute minimum, since shear forces are probably the least concern for a concrete slab, right?
Best regards from the Rhineland
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