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Hi, Thanks for all your suggestions - have talked it through with the builder and most liketly it was to do with the acros being removed too soon as suggested. Hopefully this has just lead to some settling onto the steel and their will be no further movement. The builder made good the crack...

That said - I did notice that the needles came out the same day that the steel went in which I thought was a little unusual. The mortar was definitely still wet at the time.

Hi, He used 4 acro props (2 each side) with timber needles. The room is 3.1m wide and the opening is about 2.6m wide. However, I didn't pay close enough attention to his technique to be able to describe how he used the needles Will take some photos today

Hi, Our builder has just open-planned a kitchen/diner for us by removing an internal load-bearing wall. Almost immediately afterwards a sizeable crack appeared in the wall in the room above (about 1.5m long amd 5mm wide in the mortar between bricks). We are confident he has followed...