|Ing. Alessandra Favarato,
NPS® Top Down is recommended when worksite impact must be limited, or in urban contexts with substantial infrastructure and historic areas. Thanks to considerable axial rigidness provided by decks, it prevents detensioning of surrounding earth, sinking, and the risk of nearby buildings slipping. It is also suitably applied in cases of decks with great span, to counteract earth and water pressure, and to limit the criticality in verifying buoyancy. Care should be taken in placing the slots that must be left in the roofing to move materials and for the cast.