A method of supporting loose fill insulation in a wall cavity with a flexible netting. The netting is secured to the wall cavity frame by fastening the upper and lower edges of the netting to the upper and lower wall joists with a multiplicity of spaced apart fasteners, and gluing the two side edges of the netting to the left and right vertical studs with a flowable adhesive. A small slit is made in the netting to accommodate the insulation nozzle, which is preferably angled at its end to facilitate reaching into small spaces and cracks. Loose fill insulation is blown into the cavity behind the netting after inserting the insulation hose through the slit in the netting.