An average size home will take no more than 1 to 2 days to insulate. Depending on the type of construction of your home (or other building work being undertaken), the installation can be done from either the internal or external wall surface. The process involves drilling small access holes into each stud cavity along the walls whether these be brick or weatherboard/fibro. (The foam is then injected into each cavity and flows through the space to fill all cracks and voids. After filling, the holes are then filled with a suitable filler material which can then be painted as required. For Facebrick homes, the holes are patched using a suitable mortar to match as closely as possible the existing mortar.(