This residential project saw the collaboration between the contractor Rob Doughty with Pr. Engineer Alan Hendrie and Cobute precast. The scope of the project included the first floor extension, as well as the creation of a new balcony in the existing structure. To achieve this, Cobute supplied a comprehensive range of solutions, which included precast slab system, beams and the nifty edge ribs.
One of the fun challenges was creating a gutter inside the slab, with the use of polystyrene.
What is an edge rib?
Cobute combined the structural elements of the beam and the rib in its precast edge rib, a permanent concrete edge shutter. This element consists of an L shaped rib, with zigzag steel and a concrete edge and it is useful for the creation of an edge to a cantilever balcony, like in the current project.
The edge rib replaces timber shutters that would increase not only the amount of waste on site but also installation speed, while improving the finishing.
The engineer design specifies both the steel reinforcement of the edge rib, as well as the height of the side panel, which ranges from 150 to 300 mm. When used combination with the slab system, the rib can include a lip. Once poured, the permanent shutter forms the outer side of a concrete edge, without requiring any carpentry work.
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