Soffits should be vented or lower roof intake vents employed

Soffits are designed to allow air intake into the attic space.  If they are blocked for any reason the intake ventilation must be created through Roof intake vents.  These are vents installed on the top of the roof but down near the Eave edges.  They must be installed on both sides of the roof to balance.  This is now common practice in New construction.