A waffle pod slab: Being on-ground eliminates the need for trenching. Polystyrene void formers are arranged in a grid pattern with reinforcing between and above. Concrete fills the spaces between ...

Bright said using slab tanks does not diminish the strength of a house's foundations. ``To save on concrete, builders have usually put down blocks of polystyrene foam, know as waffle pods ...

like those who sell steel reinforcement for slabs.” He said Biax overcame many of the downsides of the waffle pod system, and its stackable design took up about 80 per cent less space on-site.

Questions are being raised about a $640,000 grant to make polystyrene waffle pods after the same material was banned under the Plastic Reduction and Circular Economy Act 2021. In June, a ...