i dnt think they would crack in that pattern rich.
ive just had a job cancel on me well they rang me and i tried to diagnose it then told them to get onto the insurance about it, basically the kitchen internal skin only had a massive crack running up and diagnoaly and getting wider as it goes up, movement right, then i noticed it went accross the floor all as one huge crack, but not on the external skin of brickwork:RpS_confused:.
i asked them a bit of history and they said they used to have loads of trees outside there house but now theres only one right outside there kitchen and one week the council turned up and ripped the others out.
ive come up with the idea that now the trees are out the water table has rose and a major root running under the extension is now swelling with extra water pushing the slab up and moving the internal skin.
why not the outside???? used to be cladding and timber frame but they replaced it with brickwork and its not joined to the internal skin thus not moving