The lost formwork system consists of a galvanized steel ribbed profile that serves as formwork for a concrete slab executed in situ. The main function of the corrugated profile is to support the loads of execution and pouring of concrete, avoiding the need for shoring.
Unlike the composite slab solution, in the lost formwork solution the profiles do not have inlays and do not subsequently collaborate with the concrete slab. Due to this lack of contribution from the sheet metal, the use of positive reinforcement in the slab is mandatory, using a bar in each rib of the profile. Using this solution, light slabs can be made, with a self-weight of less than 2 kN/m², through an agile and simple execution procedure.
- Versatility: Adapts to any type of plant, offering flexibility in architectural design.
- Strength/Weight Ratio: Provides greater resistance with a lower own weight, which allows reducing the overall weight of the structure.
- Speed of installation: The elimination of shoring allows the concreting of more than one floor simultaneously, considerably reducing the execution time.
- Cost Reduction: A reduction in labor costs is achieved by avoiding shoring and in materials, by using a smaller volume of concrete. This implies a reduction in the weight of the structure and waste.
In addition to the main advantages, permanent formwork (non-composite) offers additional benefits, such as the simplicity of the construction process, ease of on-site stockpiling and cleaning, its function as formwork providing a safe platform to work on, and its contribution to structural bracing, thus improving its functionality and efficiency in construction.
