Plastic void former’s can be produced using recycled raw materials. Most of the time they are stack-able for easy transport and storage. Foundations built with plastic void former’s have a similar R-value like polystyrene, but they maintain their performance unaltered over a long period of time.
Plastic void formers can provide extra protection against moisture from the ground.
Finally foundations built with plastic void formers can be more structurally efficient and more cost-effective.
Some examples of foundation technologies incorporating plastic void formers:

RibRaft Xpod – http://www.firth.co.nz/residential/foundations/xpod/

Sistema Atlantis – http://www.daliform.com/en/aerated-concrete-floor-sistema-atlantis/

Bubble deck – http://www.bubbledeck.com/

Cupolex – http://www.cupolex.it/

Uboot – http://www.daliform.com/en/disposable-formwork-for-two-way-lightened-voided-slabs/

Fabio Parodi
CPEng (NZ-AU) MIPENZ Dott.Ing(ITA) M.Eng(Hons)
CEO and Founding Director of Cresco
www.cresco-group.com