An insulation confining shield and application method, the shield mountable between elongated structural framing members in an unfinished wall or ceiling for insulation dispensed as curable liquid having a blowing agent or an insulation material with a curable adhesive, comprising: a sheet of elongated semi-rigid or rigid material having a center web section and a pair of opposed flanges extending substantially perpendicular from the center web section defining an insulation confining volume, the web section and the flanges being constructed and arranged to fit between the structural framing members in the wall or ceiling to retain the insulation when cured after being applied against the web section and the flanges, in one embodiment, the flanges having a plurality of vent apertures defined therethrough to enable a quantity of the insulation, when applied, to migrate from the insulation confining volume to an area outside of the confining volume and adhere to a portion of the structural framing members to mitigate heat transfer through the structural framing members, in another embodiment, the insulation confining shield being positioned relative to the structural framing members and having larger vent apertures to enable insulation to adhere to the sides of the structural framing members through the flanges, the insulation confining shield and application method enabling insulation to be applied prior to closing off either side of an unfinished wall or ceiling.