The unique feature of the Pal-Kal system is its reliance on 1mm thick steel walls of large box section void formers to resist shear forces. Main reinforcement is a heavy preformed steel mesh top and bottom.
Pal-Kal floors are constructed in layers. Fresh concrete is placed over the entire floor shutter to a depth of around 20mm, the mesh is then laid and covered with another 20mm or so of concrete.
The boxes, typically 700mm wide, are placed onto the fresh concrete with 150mm spaces between them. Straight longitudinal bars can be located between the boxes and concrete is poured around and over them, followed by another layer of mesh and a final cover layer of concrete.