A construction system includes an insulation member. A metal support member is coupled to a side surface of the insulation member. The metal support member is a substantially C-shaped configuration. The metal support member is inserted over an upper side of the wall panel within processed portions of the insulation member to align with the side surface of the insulation member. An extension member portion of the insulation member provides an extension of the insulation member over an exterior side of the wall panel. An exterior sheath is disposed over the extension member portion of the insulation member and over an exterior side of the wall panel. An interior sheath is disposed over an interior side of the wall panel. The exterior sheath and the interior sheath include magnesium oxide.