Excavate underpin by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footing. Once underpin is carved and prepared, build and install timber forms to accommodate a positive concrete adhesion to the underside of existing footings (non-grout, overflow method) allowing for a void-less encapsulation of existing structure to fresh underpin.
Form up proposed concrete footing and fill forms with 25 MPa concrete until full and install needle vibrator. Once cured, remove timber forms.
