The NPS® Top Down system allows basement and rooftop spaces to be realised quickly without invading external areas, or requiring constraints at the site. It joins self-supporting characteristics and speed of NPS® System execution with the need to realise basement and rooftop structures capable of absorbing horizontal stress, eliminating the need for structural accessory members that anchor walls, or supporting walls (tie-rods and struts). The suitability class of the NPS® System allows perimeter wall deformation towards the beam to be counteracted, which absolves strut function and the ceiling bearing member at the same time. NPS® Top Down allows the digging phase to happen at the same time as ceiling positioning operations.
NPS® Top Down comes with a column centring system called Zenit, a device designed to adjust plano-alimetric column placing with millimetric precision, keeping them in position while the continuity case cures.