Furfix Wall Starter. The second method is using a Furfix Wall Starter. Furfix Wall Starter is basically like a crocodile clip attaching the main house to the extension. Furfix Wall Starter is added for every three rows of bricks.f the location of the drains permits, a drain pipe is often strategically placed between the two buildings as to hide the mortar joint. Customers choosing Furfix Wall Starter over Toothing-in method is often down to budget.