An insulating wall assembly including a substantially rectangular framework having opposite interior and exterior sides, the framework including a plurality of vertical support studs mounted to a plurality of horizontal end studs so as to define at least one inner spacing within the framework, the vertical support studs and the horizontal end studs having each opposite front and rear sides corresponding to the interior and exterior sides of the framework. A foam of water-based polyurethane is injected into said at least one inner spacing so as to complete fill the same and provide the wall assembly with insulating capabilities. Outer components are mounted respectively onto the interior and exterior sides of the framework so as to close up the framework and provide the wall assembly with additional insulating capabilities.