Wall structures made using composite wall panels

A method of constructing a wall structure, comprising:

• forming or providing a wall frame, the wall frame comprising a plurality of studs or other structural elements and optionally sheathing forming at least one side of the wall frame;
• fastening a plurality of interior lightweight composite panels to a first side of the wall frame to form an interior wall substructure;
• and
• fastening a plurality of exterior lightweight composite panels to a second side of the wall frame opposite the first side to form an exterior wall substructure opposite the interior wall substructure,
• the lightweight composite panels each comprising:
• a foam core having a first surface and a second surface opposite the first surface;
• a first protective layer selected from a first fiber reinforced cementitious layer, thermoset polymer layer, or magnesium oxide layer formed over and covering at least a portion of the first surface of the foam core;
• and
• a second protective layer selected from a second fiber reinforced cementitious layer, thermoset polymer layer, or magnesium oxide layer formed over and covering at least a portion of the second surface of the foam core,
• wherein the interior and exterior lightweight composite panels are each positioned so that one protective layer faces toward and another protective layer faces away from the wall frame.

A method of constructing an interior wall structure, comprising:

• forming or providing a wall frame, the wall frame comprising a plurality of studs or other structural elements and optionally sheathing forming at least one side of the wall frame;
• fastening a first plurality of lightweight composite panels to a first side of the wall frame to form a first interior wall substructure;
• and
• fastening a second plurality of lightweight composite panels to a second side of the wall frame opposite the first side to form a second interior wall substructure opposite the first interior wall substructure,
• the lightweight composite panels each comprising:
• a foam core having a first surface and a second surface opposite the first surface;
• a first protective layer selected from a first fiber reinforced cementitious layer, thermoset polymer layer, or magnesium oxide layer formed over and covering at least a portion of the first surface of the foam core;
• and
• a second protective layer selected from a second fiber reinforced cementitious layer, thermoset polymer layer, or magnesium oxide layer formed over and covering at least a portion of the second surface of the foam core,
• wherein the lightweight composite panels are positioned so that one protective layer faces toward and another protective layer faces away from the wall frame.