a method for installing insulation on cast - in - place concrete walls . the method makes efficient use of expensive wall ties used during cast - in - place construction and provides for a quick , easy to learn , cost and labor saving method for insulating concrete walls . furring strips are firmly and permanently affixed to cement walls by slotting the furring , placing them over the wall ties and driving a wedge - like member through the aperture of each wall tie which extends past the furring so that the furring is pressed tightly against the wall . insulation panels are then affixed to the furring . the method may be easily adapted for insulating cast - in - place concrete ceilings .